The EVAL5980 demonstration board provides the design engineer with a fully functional step-down switching regulator with an output current of up to 0.7 A. The L5980 integrates STMicroelectronics step-down switching regulator, together with all the external components required for a typical application.

The rated voltage of the input capacitor and the Schottky diode rectifier repetitive peak reverse voltage are both 25 V, making the board capable of covering the entire 2.9 V - 18 V input voltage range of the L5980 device.

The board features an external resistor divider (R1 and R2) designed for an output voltage of 3.3 V.

The output voltage can be set to a level from 0.6 V up to the rated voltage of the output capacitor (16 V).

The compensation network on the demonstration board allows the use of MLCC as output filter to keep the loop stable. The inductor saturation current and forward current of the Schottky diode are within the current limit values.

The switching frequency on the demonstration board is set to 500 kHz by means of the R5 resistor connected to pin Fsw.

The EVAL5983 demonstration board provides the design engineer with a fully functional step-down switching regulator with an output current of up to 1.5 A. The L5983 integrates STMicroelectronics step-down switching regulator, together with all the external components required for a typical application.

The rated voltage of the input capacitor and the Schottky diode rectifier repetitive peak reverse voltage are both 25 V, making the board capable of covering the entire 2.9 V - 18 V input voltage range of the L5983 device.

The board features an external resistor divider (R1 and R2) designed for an output voltage of 3.3 V.

The output voltage can be set to a level from 0.6 V up to the rated voltage of the output capacitor (16 V).

The compensation network on the demonstration board allows the use of MLCC as output filter to keep the loop stable. The inductor saturation current and forward current of the Schottky diode are within the current limit values.

The switching frequency on the demonstration board is set to 500 kHz by means of the R5 resistor connected to pin Fsw.

The EVAL5985 demonstration board provides the design engineer with a fully functional step-down switching regulator with an output current of up to 2 A. The board integrates STMicroelectronics' L5985 step-down switching regulator, together with all the external components required for a typical application.

The rated voltage of the input capacitor and the Schottky diode rectifier repetitive peak reverse voltage are both 25 V, making the board capable of covering the entire 2.9 V - 18 V input voltage range of the L5985 device.

The board features an external resistor divider (R1 and R2) designed for an output voltage of 3.3 V.

The output voltage can be set to a level from 0.6 V up to the rated voltage of the output capacitor (16 V).

The compensation network on the demonstration board allows the use of MLCC as output filter to keep the loop stable. The inductor saturation current and forward current of the Schottky diode are within the current limit values.

The switching frequency on the demonstration board is set to 500 kHz by means of the R5 resistor connected to pin Fsw.

The EVAL5986/A demonstration board provides the design engineer with a fully functional stepdown switching regulator with an output current of up to 2.5 A. The board integrates STMicroelectronics’ L5986\A step-down switching regulator, together with all the external components required for a typical application.

The rated voltage of the input capacitor and the Schottky diode rectifier repetitive peak reverse voltage are both 25 V, making the board capable of covering the entire 2.9 V - 18 V input voltage range of the L5986/A device.

The board features an external resistor divider (R1 and R2) designed for an output voltage of 1.8 V.

The output voltage can be set to a level from 0.6 V up to the input voltage.

The compensation network on the demonstration board allows the use of MLCC as output filter to keep the loop stable. The inductor saturation current and forward current of the Schottky diode are within the current limit values.

The switching frequency on the demonstration board is set to 500 kHz by means of the R5 resistor connected to pin Fsw.

The new VIPer17 device integrates in the same package two components: an advanced PWM controller built in BCD6 technology and an 800 V avalanche rugged vertical power MOSFET. The device is suitable for off line power converter operating both, with wide range input voltage (85 VAC - 270 VAC) up to 7 W or with single range input voltage (85 VAC - 132 VAC or 175 VAC - 265 VAC). With European range input voltage (175 VAC - 265 VAC) the device can handle up to 10 W of output power. The proposed solution has the advantage of using few external components compared to a discrete solution, providing several switch mode power supply's protections and very low stand by consumption in no load condition.

VIPer17 device operates at fixed frequency that can be 115 kHz or 60 kHz according to the part number selected. Frequency jittering is implemented and it helps to meet the standards regarding electromagnetic disturbance The several protections present on the device like: overload, output short circuit, secondary winding short, hard transformer saturation protection and brown out protections, improve the reliability and safety of the design. More over internal thermal shut down and an 800 V avalanche rugged power MOSFET improve the robustness of the system.

The present demonstration board is a standard one output isolated fly-back converter that uses all the protections above mentioned. If not necessary brown out protection and over-voltage protection could be not used reducing the number of external comp furthermore.

The EVL150W-ADP-SR demonstration board is composed of two stages: a front-end PFC using the L6563H and an LLC resonant converter based on the L6599A and the SRK2000, controlling the SR MOSFETs on the secondary side. The SR driver and the rectifier MOSFETs are mounted on a daughterboard.

The characteristics of this design are the very high efficiency and the low consumption at light load which make it a viable solution for applications compliant with ENERGY STAR® eligibility criteria (EPA rev. 5.0 COMPUTER and EPA rev. 2.0 EPS). One of the key factors to achieve high efficiency at heavy load is the SRK2000. This synchronous rectification (SR) driver for LLC resonant converters allows a significant decrease of secondary side losses.

Standby consumption is at a lowest thanks to the sleep-in function embedded in the SRK2000 and the high voltage startup circuit integrated in the

L6563H. The possibility of driving the PFC burst mode via the L6599A PFC_STOP pin dramatically boosts light load efficiency.

Additionally, a secondary sensing circuit dedicated to driving into burst mode the primary controller reduces deviation of light load efficiency against resonant circuit parameter spread, improving the repeatability of the design in production volumes.

The EVL185W-LEDTV is a high-end demonstration board tailored to the specifications of a typical LED TV application. The peculiarities of this design are the very high average efficiency of about 90%, without synchronous rectification, and very low no load consumption of 100 mW at 230 Vac. The result is that this converter is compliant to the most demanding ENERGY STAR® eligibility criteria. The architecture is made up of two sections, based on a three-stage approach: a 10 W standby supply using the new VIPer27L, which delivers the 5 V standby dedicated to supplying the microprocessor and the logic circuitry, and a bigger section composed of a front-end PFC, using the new TM L6564 and an LLC resonant converter, using the L6599A, delivering three output voltages: 12 V dedicated to supplying the TV panel, 24 V to supplying the audio power amplifiers, and 130 V dedicated to the backlight.

The PFC stage delivers 400 V constant voltage and acts as the pre-regulator for both the LLC stage and the standby supply.

An external signal, referred to secondary ground, turns the PFC and the LLC stage on and off.

The EVL250W-ATX80PL is a demonstration board of a 250 W power supply unit that implements an ATX like (multiple output configuration) or a server like (single output configuration) design.

The EVL250W-ATX80PL has been certified by ECOS Consulting committee compliant to the 80 PLUS® specifications.

The EVL6564-100W demonstration board implements a 100 W power factor correction (PFC) pre-regulator, continuous power, on a regulated 400 V rail from a wide range mains voltage and provides for the reduction of the mains harmonics, which allows meeting the European EN61000-3-2 or the Japanese JEITA-MITI standard. The regulated output voltage is typically the input for the cascaded isolated DC-DC converter that provides the output rails required by the load.

The board is designed to allow full-load operation in still air.

This demonstration board is based on the new transition-mode PFC controller L6564H and implements a 100 W, wide-range mains input, PFC pre-conditioner suitable for ballast, adapters, flat screen displays, and all SMPS having to meet IEC61000-3-2 or JEITA-MITI regulations.

The L6564H is a current-mode PFC controller operating in transition mode (TM) which embeds the same features existing in the L6564 with the addition of a high voltage startup source. These functions make the IC especially suitable for applications that must be compliant with energy saving regulations and where the PFC pre-regulator works as the master stage.

The EVAL6564H-100W implements a power factor correction (PFC) pre-regulator 100 W, continuous power, on a regulated 400 V rail from a wide-range mains voltage and providing for the reduction of the mains harmonics, allowing the European EN61000-3-2 or the Japanese JEITA-MITI standard to be met. The regulated output voltage is typically the input for the cascaded isolated DC-DC converter that provides the output rails required by the load.

In this data brief of the EVL6566A-75WADP demo board, the main characteristics and features of a 75 W adapter wide-range input mains, powerfactor- corrected AC-DC adapter using the new L6566A controller and the L6563 dedicated to the PFC stage are described.

High efficiency and the very low standby input consumption are highlighted in the following figures and tables. The board is programmed for working at fixed frequency (65 kHz) under nominal condition (19 V at 4 A).

On the secondary side the TSM1014 with a precise voltage reference and the optocoupler SFH617A-4 to transfer the error amplifiers information to the primary side have been used.

The board implements a reference design of a 40W Switch Mode Power Supply dedicated to Set-Top Box, DVD and Auxiliary SMPS for Flat TV or small size Flat screen equipment. The board accepts wide range input voltage (90 to 265Vrms) and delivers 4 voltages. It is based on the L6566B, a new current mode fixed frequency or QR controller. High efficiency and low standby consumption are the main characteristics of this board. This joined to minimal part count required and low cost approach of the global solution makes it a very interesting solution for powering Digital Consumer Equipment, capable of meeting worldwide standby rules.

The topology of this converter is the classical Flyback, working in continuous and discontinuous conduction mode with fixed frequency, capable of achieving the best trade-off between the peak/rms current ratio and output capacitors size. The nominal switching frequency, 62 KHz, has been chosen to get a compromise between the transformer size and the harmonics of the switching frequency, optimizing the input filter size and its cost. The input EMI filter is a classical Pi-filter, 1-cell for differential mode noise. The MOSFET is a standard and inexpensive 600V-2Ωmax, TO-220FP, needing a just small heat sink. The transformer is a layer type, using a standard ferrite type EER28L. It has been designed according to the EN60065. The reflected voltage is 70V, providing enough room for the leakage inductance voltage spike with still margin for reliability of the MOSFET.

The output rectifiers have been selected according to the maximum reverse voltage, forward voltage drop and power dissipation. The rectifiers for 5V and 12V outputs are Schottky, low forward voltage drop type, hence dissipating less power with respect to standard types. They are housed in TO-220 package. A small heat sink for both devices is required. The other two output rectifiers are Schottky too but with a smaller package. The snubber R2 and C7 damps the oscillation produced by the diode D2 at MOSFET turn-on. A small LC filter has been added on all output in order to filter the high frequency ripple without increasing the output capacitors and a capacitor (100nF) has been placed on each output, to limit the spike amplitude.

The output voltage regulation is performed by secondary feedback sensing the 12V, 5V and 3.3V outputs, while for 1.8V output the regulation is achieved by the transformer coupling. The feedback network uses a TS2431 as error amplifier which drives an optocoupler SFH617A-4, insuring the required insulation between primary and secondary. The opto-transistor modulates directly the voltage on COMP pin of the L6566B.

The controller, the new L6566B, is an extremely versatile current mode primary controller embedding all functions needed to get very high performances power supplies. It integrates also all protections are needed by a power supply offering a very high degree of flexibility to the designer.

The EVL6699-150W-SR board is made up of two stages: a front-end PFC using the L6563H, an LLC resonant converter based on the L6699 and the SRK2000, controlling the SR MOSFETs on the secondary side. The SR driver and the rectifier MOSFETs are mounted on a daughterboard.

The L6563H is a current mode PFC controller operating in transition mode and implements a high voltage startup source to power on the converter.

The L6699 integrates all the functions necessary to properly control the resonant converter with a 50% fixed duty cycle and working with variable frequency.

The output rectification is managed by the SRK2000, an SR driver dedicated to LLC resonant topology.

The PFC stage works as pre-regulator and powers the resonant stage with a constant voltage of 400 V. The downstream converter operates only if the PFC is on and regulating. In this way, the resonant stage can be optimized for a narrow input voltage range.

The L6699's LINE pin (pin 7) is dedicated to this function. It is used to prevent the resonant converter from working with too low input voltage that can cause incorrect capacitive mode operation. If the bulk voltage (PFC output) is below 380 V, the resonant startup is not allowed. The L6699 LINE pin internal comparator has a hysteresis allowing the turn-on and turn-off voltage to be independently set. The turn-off threshold has been set to 300 V allowing the resonant stage to operate in the case of mains sag and consequent PFC output dip.

The transformer uses the integrated magnetic approach, incorporating the resonant series inductance. Therefore, no external, additional coil is needed for the resonance. The transformer configuration chosen for the secondary winding is centre tap.

On the secondary side, the SRK2000 core function switches on each synchronous rectifier MOSFET whenever the corresponding transformer half-winding starts conducting (i.e. when the MOSFET body diode starts conducting) and then switches it off when the flowing current approaches zero. For this purpose, the IC is provided with two pins (DVS1 and DVS2) sensing the MOSFETs drain voltage level.

The SRK2000 automatically detects light load operation and enters Sleep mode, disabling MOSFET driving and decreasing its own consumption. This function allows great power saving at light load with respect to benchmark SR solutions.

In order to decrease the output capacitor size, aluminium solid capacitors with very low ESR were preferred to standard electrolytic ones. Therefore, high frequency output voltage ripple is limited and output LC filter is not required. This choice allows the saving of output inductor power dissipation which can be significant in the case of high output current applications such as this.

This board implements a 5 W (5 V / 1 A) wide range mains battery charger with constant voltage-constant current, tailored for AC-DC chargers for mobile phones and adapters and other hand-held equipment.

The core of the application is the ALTAIR05T-800, the first “All-primary sensing switching regulator” of the new ALTAIR family.

The IC combines a high-performance low-voltage PWM controller chip and an 800 V, avalanche-rugged Power MOSFET in the same package.

The PWM chip is a quasi-resonant (QR) current-mode controller IC specifically designed for QR ZVS (zero voltage switching at switch turn-on) flyback converters.

The device is capable of providing constant output voltage (CV) and constant output current (CC) regulation using primary-sensing feedback. This eliminates the need for the optocoupler, the secondary voltage reference, as well as the current sensor, while still maintaining quite accurate regulation.

In addition, it is possible to compensate the voltage drop on the output cable, so as to improve CV regulation on the externally accessible terminals.

Extremely low consumption under no load conditions is ensured thanks to a controlled burst-mode operation that, along with the built-in high-voltage startup circuit and the low operating current of the device, helps minimize the residual input consumption. Although an auxiliary winding is required in the transformer to correctly perform CV/CC regulation, the chip is able to power itself directly from the rectified mains. This is useful especially during CC regulation, where the flyback voltage is generated by the winding drops.

This board implements a 7.5 W double output wide range mains adapter with constant voltage - constant current, developed to build an innovative AC-DC adapter to supply a complete power line communication based on the ST7580.

The power supply provides a 13 V output voltage to supply the power line modem (PLM) and the analog circuitry, and a post-regulated 3.3 V to supply digital circuitry and an optional external microcontroller.

The board uses the new ALTAIR04-900, a quasi-resonant (QR) current-mode controller IC specifically designed for QR ZVS (zero voltage switching at switch turn-on) flyback converters, which combines a high-performance low-voltage PWM controller chip and a typical 16 R_DS(on), 900 V, avalanche-rugged Power MOSFET in the same package.

The device is capable of providing constant output voltage regulation using primary-sensing constant voltage loop (CV loop). This eliminates the need for the optocoupler and the secondary voltage reference while still maintaining quite accurate regulation.

In addition, by using the primary constant current loop (CC loop), it is possible to set the maximum deliverable output current without any secondary components or current sensor.

The board implements several protections that considerably increase end-product safety and reliability: auxiliary winding disconnection (or brownout) detection, shorted secondary rectifier detection, and transformer saturation protection: all of which are in auto-restart mode.

The circuit operates from 85Vac to 264Vac input voltage with an output power peak of 6W through two output voltages of 5Vdc and 12Vdc. It contains an input fuse (F2), EMI filtering (C1, L1, and C2), and the secondary regulation is provided by U2 and U3, the optocoupler and TL431 respectively. For output filtering, the components used are the output capacitors C8 and C10. These two output capacitors are sized according to the ripple current and ripple voltage specifications. The two specifications determine the ESR and RMS current capabilities of the capacitors used. An additional LC (PI) filter is added to the 5Vdc output, C9-L2 configuration, for further effective ripple and noise rejection. The AC input is rectified and filtered by the bridge BR1 and the bulk capacitor C1 to generate the high voltage DC bus applied to the primary winding of the transformer, T1. The 5Vdc output is sensed with an optocoupler. It is possible to modify the output voltages by changing the transformer turns ratio and modifying the resistance values of R7 and R8 in the feedback loop. R2 and C4 form the snubber circuit needed to reduce the voltage ringing on the drain pin and the leakage spikes.

This reference design board is an offline widerange power supply that incorporates the VIPer53-E, and is set up for secondary regulation by driving the PWM controller through an optocoupler. The switching frequency is set at 100 kHz and the total output power is 24 W.

The STEVAL-ISA011V1 demonstration board is a low power (4.1 W output), general purpose adapter. The design is based on the VIPER12ADIP-E monolithic device which, in the same package, integrates the high voltage power switch and the basic control function needed for a current mode flyback converter.

The board can handle a wide range AC input voltage, from 88 Vac to 265 Vac, with one output voltage of 4.5 V delivering a maximum output current of 900 mA.

The main applications for this board are auxiliary power supplies and wall-plug adapters.

This reference design represents a cost effective solution for low power high voltage power supplies. It has been developed to cover applications requiring an ultra-wide input voltage range (between 90 and 450 V_AC), typical of threephase applications. This requires the use of very high voltage components, which increases cost, size, weight and the overall complexity of the power supply. The circuit includes a switching transistor connected between the input rectifier and the DC bulk capacitor (STMicroelectronics patent). The series switch limits the DC input voltage of the power converter by means of a driving circuit; thus the SMPS primary transistor can be selected as a standard part as well as a smart power primary IC.

Typical end applications for this solution can be found in the industrial market in the range below 5 W, such as three-phase and single-phase power meters, industrial bias power supplies and auxiliary SMPS for high voltage street lighting, where the input voltage can range from 90 V_AC to 450 V_AC and 1000 V Power MOSFETs are currently used.

The travel adaptor design presented here has been made with the aim of minimizing overall cost for a secondary voltage and current regulated adapter topology widely used in cellular phone adapters. Thanks to the VIPer12A low power consumption, it is possible to achieve 100mW standby power in a wide range of operations, as recommended by the "European Commission of Energy".

The STEVAL-ISA019V3 demonstration board is a 3-phase auxiliary power supply with an 80 W dual output SMPS, using the L6565 PWM driver and the STC04IE170HP ESBT as the main switch. The combination of these ST parts provides a high-efficiency solution for high DC input voltage, a typical requirement of any 3-phase application.

The necessity to handle both high output power and wide input voltage is resolved using a flyback stage working in mixed operation mode: discontinuous and continuous.

The STEVAL-ISA020V1 battery charger demonstration board utilizes an AC-DC single output converter with approximately 3.5 W of power capability.

The simple and cost-effective design is based on the Viper12AS-E low power off-line SMPS primary switcher for power conversion, and the TSM101 voltage and current controller for monitoring the battery charge level.

This is an ideal solution for a 25 W switch mode power supply (SMPS) dedicated to industrial or white-goods applications. The board accepts a wide range of input voltages (90 to 265 Vrms) and delivers 2 negative output voltages. The switchmode power supply(SMPS) is based on the VIPer53-E. The VIPer53-E combines an enhanced current-mode PWM controller with a high-voltage MDmesh™ Power MOSFET in the same package. The main characteristics of the evaluation board are its high efficiency and low standby consumption. These, combined with the minimal component count and global low cost approach, makes it an ideal solution for powering industrial or consumer equipment, while also meeting worldwide consumption requirements.

This 4-layer PCB demonstration board is designed as a step-down DC-DC converter to demonstrate the operation of the L6725 device in a general-purpose application. The input voltage can range from 4.5 V to 14 V with an output voltage of 3.3 V. The module can deliver an output current in excess of 20 A. The L6725 device can manage minimum ON times (T_ON) shorter than 100 ns. This makes possible conversions with very low duty cycles and very high switching frequencies. The switching frequency is initially set at 250 kHz (controller free-running FSW), but a switching frequency of 500 kHz can also be selected.

This 4-layer PCB demoboard implements a stepdown DC/DC converter and shows the operation of the L6730 device in a general-purpose application. The input voltage can range from 4.5 V to 14 V and the output voltage is 3.3 V. The module can deliver an output current in excess of 30 A.

The switching frequency is set at 400 kHz (controller free-running FSW), but it can be increased up to 1 MHz. A 7-position dip-switch selects the UVLO threshold (5 V or 12 V bus), the OVP intervention mode and the sink-mode current capability.

This 4-layer PCB evaluation board implements a step-down DC-DC converter and demonstrates the operation of the L6732 device in a generalpurpose application. The input voltage can range from 4.5 V to 14 V with an output voltage of 3.3 V.

The module can deliver an output current in excess of 20 A. The switching frequency is initially set at 250 kHz (controller free-running FSW), but a 500 kHz switching frequency can also be selected.

The purpose of this design is to demonstrate the key features of STMicroelectronics L6727 a new powerful buck controller. The L6727 allow simple, cost effective design of complete step-down voltage regulators. Indeed it provides a full solution by integrating a 0.8V reference, control logic and protection, and NMOS drivers in an 8pin package. L6727 demo board realizes in a four layer PCB a step-down DC/DC converter and shows the operation of the device in a general purpose application. The input voltage can range from 5V to 12V buses and the output voltage is fixed at 1.25V. The application can deliver an output current up to 20A. Airflow must be applied with current higher than 18A (@V_in=5V). The switching frequency is 300 kHz.

The STEVAL-ISA029V1 evaluation board is an isolated triple-output flyback converter, suitable for wide-range input voltage operation. The converter is based on the smart power VIPer53-E, which integrates, in the same package, an enhanced current-mode PWM controller with a high-voltage MDmesh™ Power MOSFET. The switching frequency is set to 60 kHz by means of an external RC network connected to a dedicated pin on the IC. The closed loop regulation is performed on the 12 V output using an optocoupler, which drives the COMP pin of the VIPer. The 3.3 V output is post regulated using a non-integrated low drop linear voltage regulator to achieve the required accuracy. The negative 24 V output is achieved by means of a discrete linear voltage regulator, made up of a Zener diode, a resistor and a PNP transistor.

The STEVAL- ISA032V1 forward converter demonstration board is a power supply based on the primary controller L5991 and the STP10NK60Z N-channel 600 V power MOSFET.

It is designed to be suitable to supply power to the electronic fiscal cash register (EFCR) demonstration board STEVAL-IPC001V1.

The STEVAL- ISA032V1 demonstration board accepts a wide range of input voltage (88 to 265 Vac) and delivers a single 9 V output with a power capability of up to 50 W continuous, and 60 W peak, making it also capable of providing power to a thermal printer.

The STEVAL-ISA050V1 demonstration board is based on the PM6641, that is a monolithic voltage regulator module, with internal Power MOSFET, specifically designed to supply DDR2/3 memory and chipset in ultra-mobile PC and real estate portable systems. It integrates three independent, adjustable, constant frequency buck converters, a ±2 Apk low drop-out (LDO) linear regulator and a ±15 mA low noise buffered reference. Each regulator is provided of basic under voltage (UV) and over voltage (OV) protections, programmable soft-start and current limit, active soft-end and pulse-skipping at light loads.

This evaluation board is based on the PM6670S and represents a complete DDR2/3 power supply regulator for portable applications designed to meet JEDEC specifications. It integrates a constant on-time (COT) buck controller, a 2 Apk sink/source low drop-out regulator and a 15 mA low noise buffered reference. The COT architecture assures fast transient response supporting both polymeric and ceramic output capacitors. An embedded integrator control loop compensates the DC voltage error due to the output ripple. The 2 Apk sink/source linear regulator provides the memory termination voltage with fast load transient response.

The device is fully compliant with system sleep states S3 and S4/S5, providing LDO output high impedance in suspend-to-RAM and tracking discharge of all outputs in suspend-to-disk.

This demonstration board introduces a solution for industrial power supplies. It takes advantage of the high voltage Power MOSFET, i.e. 1500 V breakdown voltage, to optimize the operation of the flyback converter based on the primary controller UC3844B.

The demonstration board has been designed and developed in order to address medium power applications. The board features two outputs, 24 V, 5V or 3.3 V, and is able to deliver more than 100 W in total.

The 5 V/3.3 V output is obtained by means of an integrated DC-DC converter based on L5970D, connected to the 24 V output, and adjustable by means of an external voltage divider.

The typical application implemented in this demonstration board, based on the TSM108, is a battery charger. The device is a step down controller that features constant voltage and constant current regulation and can drive either a p-channel MOSFET or a PNP bipolar transistor.

This demonstration board was designed to allow different converter configurations. Several options for power semiconductor footprints are available on the PCB in order to make it adaptable to a wide range of converter output power.

The TSM108 is especially suited for cigarette lighter accessories.

This demonstration board is based on the new VIPer17H device, that is a converter that offers in one package a PWM controller built in BCD6 technology and a 800 V avalanche rugged vertical power section.

The VIPer17H switches at 115 kHz and can deliver 6 W from wide range operation from 85 Vac to 305 Vac. It can also deliver 10 W when operating from European range of 175 Vac to 264 Vac.

This demonstration board has additional features asked by many customers: Standby wattage as low as 50 mW at no load.

Frequency jittering is implemented to make EMI measurement meet today's standards. Adjustable overload. Output short-circuit protection for hard short such as transformer saturation or shorted diode. Adjustable brown out and brown in feature.

Output over voltage protection.

The same PCB board has been designed in such a way that can be populated for either the double or even single output. The only difference between them is the extra output parts, the transformer, and the voltage divider for the feedback loop.

The STEVAL-ISA063V2 demonstration board implements a typical buck-boost DC-DC converter based on STMicroelectronics’ STBB1-APUR high efficiency single inductor dual mode buck-boost DC-DC converter.

The device is fixed frequency and capable of providing output voltages ranging from 1.2 V to 5.5 V and input voltages from 2.0 V to 5.5 V.

The STBB1-APUR can operate with input voltages higher than, equal to, or lower than the output voltage, rendering the product suitable for single lithium-ion (Li-Ion), multicell alkaline or NiMH applications where the output voltage is within the battery voltage range.

The integrated low-R_DSonN-channel and P-channel MOSFET switches contribute to its high efficiency.

The STEVAL-ISA068V1 is based on the ST1S32, an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator.

This device operates from 2.8 V to 5.5 V input, while it regulates an output voltage as low as 0.8 V and up to V_in.

The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.

The STEVAL-ISA069V1 demonstration board is based on the ST1S31, which is an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator. This device operates from 2.8 V to 5.5 V input, while it regulates an output voltage as low as 0.8 V and up to Vin.

The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.

The STEVAL-ISA070V1 demonstration board is based on the ST1S31, an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator. This device operates from 2.8 V to 5.5 V input, while it regulates an output voltage as low as 0.8 V and up to Vin.

The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.

The STEVAL-ISA071V1 switched-mode power supply (SMPS) demonstration board is dedicated to mains applications requiring -5 V and +7 V referred to neutral. The non-isolated SMPS is capable of delivering 4 W of output power over a wide input voltage range. This capability can also be applied to higher power outputs or different voltage ranges.

The SMPS generates 5 V and 12 V. The 5 V can be used to supply the MCU, directly driving a Triac connected to neutral, and the 12 V can be used to supply additional circuits, such as relays, OAs, etc.

The STEVAL-ISA071V2 demonstration board is a non-insulated SMPS capable of delivering a 4 W output over a wide input voltage range and is designed for a mains application requiring -5 V and +7 V, referred to neutral.

The basic concepts used in this design can also be applied for higher power outputs or different voltage ranges.

The SMPS generates outputs of 5 V and 12 V, referred to the output marked -5 V. The 5 V output is dedicated to supplying an MCU. This configuration allows the use of the MCU to directly drive a Triac (referred to neutral).

The 12 V output is used to supply additional circuits (relays, OA, etc.).

The STEVAL-ISA076V2 demonstration board is based on the L6924U which is a fully monolithic battery charger dedicated to single-cell Li-Ion/Polymer battery packs. It is the ideal solution for space-limited applications, such as PDAs, handheld equipment, cellular phones, and digital cameras.

When an external voltage regulated adapter or USB port is used, the L6924U works in linear mode, and charges the battery in a constant current/constant voltage (CC/CV) profile.

Moreover, when a current-limited adapter is used, the device can operate in Quasi-Pulse Mode, dramatically reducing the power dissipation.

The STEVAL-ISA077V1 demonstration board is based on the L6920DB which is a high efficiency monolithic step-up switching converter IC especially designed for battery powered applications, thanks to its minimum startup of 0.8 V, and a minimum operating voltage of 0.6 V.

It requires only three external components to realize the conversion from battery voltage to the selected output voltage.

It has a minimum output voltage of 1.8 V, which is enough to supply even the most advanced ASICs and microprocessors.

The high switching frequency allows the user to choose small inductors and output capacitors for their designs. Supervisory functions include reference voltage, low battery detection, and shutdown, which are provided with overcurrent protection.

The STEVAL-ISA079V2 demonstration board is based on the L6928 DC-DC monolithic regulator, specifically designed to provide extremely high efficiency.

The L6928 supply voltage can be as low as 2.0 V, allowing its use in single Li-Ion cell supplied applications.

The output voltage can be selected by an external divider down to 0.6 V. The duty cycle can saturate to 100%, allowing low dropout operation.

The STEVAL-ISA081V1 demonstration board is a switched mode power supply (SMPS) demonstration board and it is an isolated SMPS capable of delivering a 12 W output over a wide input voltage range.

It is designed for a mains application focusing on cost and size effective solutions.

The STEVAL-ISA081V1 SMPS generates 12 V nominal output voltage using primary regulation and it is based on the VIPER26 monolithic converter, integrating a high voltage MOSFET and PWM controller in one package.

The STEVAL-ISA082V1, based on the ST1S40IPHR, is an internally compensated 800 kHz fixed-frequency PWM synchronous step-down converter demonstration board.

The ST1S40 operates from 4.0 V to 18.0 V input, while it regulates an output voltage as low as 0.8 V and up to V_IN(100% duty cycle).

The ST1S40 integrates a 95 mΩ high-side switch and a 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltage.

The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.

The ST1S40 is protected through cycle-by-cycle current limiting in case of overload and is also protected by a current foldback function with frequency reduction in case of short-circuit.

The device is available with an enable on/off function.

The STEVAL-ISA083V1, based on the ST1S40IPUR, is an internally compensated 800 kHz fixed-frequency PWM synchronous step-down converter demonstration board.

The ST1S40 operates from 4.0 V to 18.0 V input, while it regulates an output voltage as low as 0.8 V and up to V_IN(100% duty cycle).

The ST1S40 integrates a 95 mΩ high-side switch and a 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltage.

The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.

The ST1S40 is protected through cycle-by-cycle current limiting in case of overload and is also protected by a current foldback function with frequency reduction in case of short-circuit.

The device is available with an enable on/off function.

The STEVAL-ISA084V1, based on the ST1S40, is an internally compensated 800 kHz fixed-frequency PWM synchronous step-down converter demonstration board.

The ST1S40 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to VIN (100% duty-cycle).

The ST1S40 integrates 95 mΩ high side switch and 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.

The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.

The device is protected through cycle-by-cycle current limiting in case of overload and is also protected by current foldback function with frequency reduction in case of short-circuit

The device is available with an enable on/off function.

The STEVAL-ISA088V1 demonstration board provides a platform for evaluation of the L5970D, a step-down monolithic power switching regulator capable of delivering up to 1 A of current at output voltages from 1.2 V to 35 V.

The input supply voltage of the STEVAL-ISA088V1 can range from 4.4 V to 25 V based on the rated voltage of the input capacitor, while the output voltage is adjustable from 1.235 V to VCC.

The STEVAL-ISA089V1 demonstration board provides a platform for evaluation of the L5972D, a step-down monolithic power switching regulator with a minimum switch current limit of 2 A capable of delivering more than 1.5 A of DC current to the load depending on application conditions.

The input supply voltage of the STEVAL-ISA089V1 can range from 4.4 V to 25 V based on the rated voltage of the input capacitor, while the output voltage is adjustable from 1.235 V to VCC.

The STEVAL-ISA090V1 demonstration board provides a platform for evaluation of the L4973, a 3.5 A step-down monolithic power switching regulator operating in continuous mode.

Based on the selection of the external components, the device can operate in the entire input voltage range of 8 V < V_IN< 55 V. The output voltage is limited by the voltage rating of the output capacitor, so it can be adjusted within the 3.3 V < V_OUT< 30 V range through voltage divider R₃, R₄. The input and output capacitors are capable of sustaining the RMS current within the operating range.

The STEVAL-ISA091V1 is step-down switching power supply based on STMicroelectronics’ L7980 switching regulator in a QFN package.

The L7980 features an embedded power MOSFET and is capable of delivering up to 2 A of current to the load, depending on the application conditions.

The input voltage can range from 4.5 V to 28 V, while the output voltage can be set from 0.6 V to V_IN.

Requiring a minimum number of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The STEVAL-ISA092V1 is a step-down switching power supply based on the L7980 in a QFN package.

The L7980 is a step-down switching regulator with embedded Power MOSFET, so it is able to deliver up to 2 A current to the load depending on the application conditions.

The input voltage can range from 4.5 V to 28 V, while the output voltage can be set starting from 0.6 V to VIN.

Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The STEVAL-ISA093V1 is a step-down switching power supply based on STMicroelectronics’ L7981 switching regulator in a QFN package.

The L7981 features an embedded power MOSFET and is capable of delivering up to 3 A of current to the load, depending on the application conditions.

The input voltage can range from 4.5 V to 28 V, while the output voltage can be set from 0.6 V to VIN.

Requiring a minimum number of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The STEVAL-ISA094V1 is a step-down switching power supply based on STMicroelectronics’ L7981 switching regulator in an HSOP8 package.

The L7981 features an embedded power MOSFET and is capable of delivering up to 3 A of current to the load, depending on the application conditions.

The input voltage can range from 4.5 V to 28 V, while the output voltage can be set from 0.6 V to V_IN.

Requiring a minimum number of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The STEVAL-ISA096V1 is a switched mode power supply (SMPS) demonstration board. This non-isolated SMPS is designed in a buck-boost topology and is capable of delivering up to 2 W of output over a wide input voltage range.

This board also offers the user the possibility of adapting the circuit to specific needs, thanks to an available free PCB area.

The SMPS generates 12 V of nominal output voltage.

The STEVAL-ISA096V1 demonstration board is based on the VIPer06, a monolithic converter that integrates an 800 V avalanche-rugged MOSFET and PWM controller in one package, offering a cost-effective and space-saving solution.

The STEVAL-ISA097V1 demonstration board is a step-down switching power supply based on the L7985 in DFN10 package.

The L7985 is a step-down regulator with a 2.5 A (minimum) current limited embedded power MOSFET, so it is able to deliver up to 2 A current to the load depending on the application conditions.

The input voltage can range from 4.5 V to 38 V, while the output voltage can be set starting from 0.6 V to V_IN.

Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The STEVAL-ISA098V1 demonstration board is a step-down switching power supply based on the L7985A in HSOP8 package.

The L7985A is a step-down regulator with a 2.5 A (minimum) current limited embedded power MOSFET, so it is able to deliver up to 2 A current to the load depending on the application conditions.

The input voltage can range from 4.5 V to 38 V, while the output voltage can be set starting from 0.6 V to VIN.

Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The STEVAL-ISA099V1 demonstration board is a step-down switching power supply based on the L7986 in DFN10 package.

The L7986 is a step-down regulator with a 3.7 A (minimum) current limited embedded power MOSFET, so it is able to deliver up to 3 A current to the load depending on the application conditions.

The input voltage can range from 4.5 V to 38 V, while the output voltage can be set starting from 0.6 V to V_IN.

Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The STEVAL-ISA101V1 demonstration board is based on the L5973D, a step-down monolithic switching regulator with 2 A DC (2.5 A switch peak current) current capability over the output voltage range (1.235 V to 36 V).

The operating input voltage ranges from 4 V to 36 V. The device is based on BCD5 technology. The embedded power element is a P-channel D-MOS transistor so the driving stage does not require any bootstrap capacitor and the duty cycle can range up to 100%.

An internal oscillator fixes the switching frequency at 250 kHz. A synchronization pin is available when a higher switching frequency (up to 700 kHz) is required.

Pulse-by-pulse current protection and a frequency foldback feature always guarantee an effective short-circuit protection. Other features include voltage feed-forward, protection against feedback disconnection, inhibit and thermal shutdown.

Previous sales code: EVAL5973D.

The L6562A is a current-mode PFC controller operating in transition mode (TM). With the same pinout as its L6562 predecessor, the L6562A offers improved performance mainly in terms of efficiency and noise immunity. The STEVAL-ISA102V1 implements an 80 W, wide-range mains input and a PFC pre-conditioner suitable for ballast, adapters, flat screen displays, etc.

The STEVAL-ISA103V1 is a wide range input demonstration board based on the VIPER27LN and suitable for several consumer applications, such as LCD or plasma TVs, some models of DVD recorders, set-top boxes with hard disk, and also desktop computers.

The STEVAL-ISA103V1 includes two modules: the main power supply that provides most of the power and is off when the application is in standby mode and the auxiliary power supply that provides energy for specific peripherals such as USB ports, remote receivers, and modems.

The auxiliary power supply is also on when the application is in standby mode and it is often required that its input power be as low as possible.

The STEVAL-ISA103V1meets the specifications of a wide range of auxiliary power supplies for the above mentioned applications and is optimized for very low standby consumption, helping to meet the most stringent energy-saving requirements.

The STEVAL-ISA104V1 is designed in order to evaluate the ST1S14, a step-down monolithic power switching regulator able to deliver up to 3 A; this high current level is also achieved thanks to a HSOP8 package with exposed frame.

The output voltage can be set from 1.22 V.

An internal oscillator fixes the switching frequency at 850 kHz.

Power Good open collector output validates the regulated output voltage as soon as it reaches the regulation.

Pulse-by-pulse current limit offers an effective constant current short-circuit protection while the current foldback decreases overstress in persistent short-circuit condition.

The STEVAL-ISB001V1 demonstration board is a ringing choke converter (RCC)-based, step-by-step cell phone battery charger.

The RCC is essential to the self-oscillating flyback converter, and operates within the discontinuous conduction mode (DCM) and continuous conduction mode (CCM) boundaries without noticeable reverse recovery of the output rectifying diodes.

RCC control is achieved by using discrete components to control the peak current mode, so the overall RCC cost is relatively low compared to the conventional pulse width modulation (PWM) IC flyback converter. As a result, RCC is widely used for low-power applications in industry and home appliances as a simple and cost-effective solution.

The STEVAL-ISB006V1 demonstration board is based on the STw4102, a stand-alone constantcurrent constant-voltage (CCCV) linear charger dedicated for Li-Ion battery. This device allows dual charging capability using the main input adaptor up to 1A (wall adaptor, car adaptor) or USB cable up to 500 mA without external component. Upper 1 A charging is possible by adding just one external transistor. This demonstration board offers programmable fast charge current up to 1A with external resistor. A thermal regulation circuitry limits the charge current against the die high power dissipation or high ambient temperature. An end of charge output pin indicates the charge termination when the fast charge current drops below 10% of the programmed current value. The STw4102 contains an accurate gas gauge based on a 13 bit AD converter. External resistor is used between battery and ground to sense a charge/discharge current. With a typical 30 m resistor, current can be up to 2.5 A.

The STEVAL-ISB007V1 demonstration board is based on the L6924, a standalone Li-Ion/ Li- Polymer battery charger. Power to the board can be supplied either by USB or an external DC adaptor.

In USB mode, the charging current of the battery complies with high-power USB device specifications. The L6924 is powered by 5 V from the USB, thus also charging the battery.

An ST7260 microcontroller is used for enumeration with the PC, to control the SD pin and to ensure compliance with USB high-power bus-powered specifications.

The board also features a general-purpose adaptor socket for use when the board is powered by an external DC supply. In this case the L6924 is completely independent of the microcontroller.

The STEVAL-ISB009V1 demonstration board, based on the STC3100, is able to monitor the critical parameters of a single-cell Li-Ion battery (voltage, temperature, and current) and includes hardware functions to implement a gas-gauge for battery charge monitoring, based on a programmable 12-bit to 14-bit A/D converter.

The battery current can be up to 2.5 A and the accumulator system provides a capacity up to +/-7000 mAh with a resolution of 0.2 mAh.

The device is programmable through an I²C interface.

The STEVAL-ISB011V1 demonstration board is based on the STC3100 battery monitoring device and the STM32 microcontroller.

The STM32 microcontroller provides a simple, compact solution to monitor the voltage, temperature, current and capacity of single cell Liion batteries utilizing the highly-efficient gas gauge capability of the STC3100.

Battery charging is performed using the USB port, or using a DC adaptor.

The STEVAL-ISB012V1 demonstration board provides a simple, compact solution to monitor voltage, current, and capacity of single cell Li-Ion batteries using the STC3105, which has a highly efficient gas gauge.

The STEVAL-ISB012V1 demonstration board has an internal charger in order to charge the battery and can be powered through a USB port or by using a DC adaptor.

The STEVAL-ISB013V1 is a demonstration board based on the STC3105 battery monitor IC. The application monitors the voltage and current of a battery and includes a Coulomb counter to keep track of the charge/discharge status.

An alarm output signals a low state-of-charge (SOC) condition and/or low battery voltage. In addition, a relaxation register begins counting when the gas gauge is in a specified light-load condition, indicating when an OCV (open circuit voltage) measurement should be made for SOC correction.

This demonstration board is a 90 W wide-range mains AC-DC adapter which is power factor corrected. Its electrical specifications are suitable for typical high-end portable computer power adapters. The particular benefits of this design are the very low no-load input consumption (<0.5 W) and the very high global efficiency.

The architecture is based on a two-stage approach: a front-end PFC pre-regulator based on the L6563 TM PFC controller and a downstream multi-resonant half-bridge converter that makes use of the L6599 resonant controller.

The STEVAL-ISQ009V1 demonstration board is composed of three identical sections (daughterboards) and a motherboard.

Each daughterboard is capable of performing DCDC conversion starting from +5 VDC and is designed to deliver 3.3 V / 5 A to the load.

The input terminals of the motherboard are connected to a +5 VDC external source and the output terminals to the load. The board can accommodate up to three DC-DC converters.

The motherboard contains the circuitry necessary to perform current sharing (utilizing the L6615) and to isolate a failed section from the load. It is designed to be adaptable to all power supplies (compatible with the L6615 absolute maximum ratings) having remote sense pins. By changing just a few components, it can be modified for new specifications.

It is possible to build a system to supply a 10 A load at +3.3 V in a 2+1 redundant configuration.

That is, whenever three sections are running, each of them supplies 3.33 A, a value lower than its nominal capability.

If one of them is switched off, the system is able to supply the load, and each section carries 5 A.

DC-DC conversion management is performed by the L6910.

It is possible to verify that disabling one section (through the relevant switch on the motherboard) does not cause overvoltage on the output or overcurrent in other sections. In the same way, enabling one section (with the other two already running) does not cause negative output voltage drop or a short to ground, and current sharing is established.

The STEVAL-ISQ010V1 demonstration board is specifically designed for the TSC102 device.

The TSC102 measures a very small voltage drop on a high-side shunt resistor and, using an internally fixed gain, amplifies the difference into a ground-referenced output voltage. The amplification gain is internally fixed. The device is housed in a tiny TSSOP8 package.

Input common-mode and power supply voltages are independent. The common-mode voltage can range from 2.8 V to 30 V during operation. Under absolute maximum rating conditions, the Vp and Vm pins can sustain as much as 60 V to handle events like load-dump conditions, and as low as -16 V to deal with reverse battery conditions.

The supply voltage can range from 3.5 V to 5.5 V, therefore the TSC102 can be supplied by the same voltage regulator used for digital circuits.

Current consumption is less than 450 μA over the temperature range, and low input bias current is less than 7 μA in standard conditions.

Current sensing is very useful for protecting applications. The STEVAL-ISQ013V1 demonstration board implements a low-side current sensing which consists in placing a sense resistor between the load and the circuit ground and the resulting voltage drop is amplified using a TS507 op amp.

The common mode voltage is close to ground, whatever the voltage of the power source, so the current sense voltage can be amplified by this low voltage op amp without any restrictions.

The circuit offers very stable electrical characteristics over the entire supply voltage range and is particularly intended for automotive and industrial applications.

The STEVAL-ISV013V1 demonstration board is a fully integrated module designed for a smart junction box in distributed photovoltaic architecture. The module represents an easy-to-use, fully-protected solution to implement precise photovoltaic panel control, diagnostics and protection.

The STEVAL-ISV013V1 demonstration board is the base element for a new photovoltaic panel configuration able to increase the panel energy produced and to simplify the photovoltaic field design and implementation. Furthermore, the maintenance cost will be reduced as the device is able to monitor the status of the individual panels and to communicate these data to a remote control unit. The STEVAL-ISV013V1 demonstration board uses an isolated converter, which is the input of the panel output. This voltage is stepped up to the voltage defined by the inverter, needed to create a sinusoidal output with a magnitude big enough to transfer energy to the grid.

The module features an embedded MPPT (maximum power point tracking) algorithm based on the “perturb and observe” (P&O) technique to search for the best operating point of the panel in order to maximize the energy produced in every environmental condition.

The module is internally protected from a surge or lightning reaching the connection wires.

The STEVAL-ISV013V1 demonstration board includes a PLM or ZigBee® module for communication. The PLM is supported by a proprietary protocol stack for networking. A gateway to RS485 in modbus is available. The unit is designed to operate in a harsh environment, offering a high level of protection and very high reliability.

The ZigBee® module is based on system-on-chip (SoC) technology, integrating both IEEE 802.15.4 radio transceiver and computing capabilities and is designed to run a fully compliant ZigBee® PRO network protocol stack.

The STEVAL-ISV014V1 demonstration board provides a very high level of integration being based on the ST devices SPV1040 (solar energy harvester and power optimizer), STBC21 (single cell Li-Ion battery charger) and STC3100 (gas gauge).

The STEVAL-ISV014V1 controls the single-cell Li-Ion battery charging thanks to the STBC21, which can be supplied by a solar panel or by an USB (Type-A connector) compatible supply. The battery charging status set by STBC21 can be controlled via I²C. Safety during the battery charge process is guaranteed by the gas-gauge controller device STC3100.

When the energy is provided by the solar panel, the SPV1040 optimizes the power extracted from the source and boosts the voltage, charging a 440 mF super-capacitor, which is connected to the input stage of the STBC21 by a STPS5PF30L P-channel Power MOS.

Furthermore, the STEVAL-ISV014V1 can be used to supply a type-B USB compatible load by an external Li-Ion battery. In this case, the L6920 voltage boost controller will regulate the battery voltage up to the 5 V required by the USB standard.

Finally, the STEVAL-ISV014V1 has a dedicated charging monitor circuitry implemented by 4 LEDs and by the TS339 quad comparator.