Flyback Converter
In its various implementations including primary side and secondary side regulation, fixed switching frequency or quasi resonant operation, an isolated or non-isolated flyback topology is most often found in off-line converters for an output power ranging from a few watts up to 100 W. The circuit operation is based on a single switch topology and the energy taken from the input is stored in the transformer’s primary inductance while the power switch is switched on, and transferred to the secondary output when the power switch is switched off.
Efficiency, power density and low stand-by power together are key requirements for flyback topologies together with reliability.
In addition to a range of controllers, power MOSFETs and integrated high-voltage converters as well as diodes and protection devices, ST offers a full set of hardware and software development and evaluation tools to help design high-efficiency, flyback AC-DC converters.
Resources
Technical Documentation
Application Notes
| Description | Version | Size | |
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AN4685: 12 V, 10 W isolated flyback converter based on VIPer25HD | 1.0 | 1 MB |
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AN4479: 12 V, 15 W peak 20 W isolated flyback converter based on VIPer38LE | 1.0 | 1 MB |
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AN4260: 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family | 4.2 | 3 MB |
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AN4940: 12 V, 7.2 W VIPer0P IR remote controlled flyback topology for air conditioning applications using VIPer0P | 1.0 | 9 MB |
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AN4924: 12 V, 8.4 W peak power 30 W isolated flyback converter using VIPer38HD | 1.0 | 2 MB |
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AN4812: 15 W, 12 V output, isolated flyback converter using Viper35HD device from the VIPer™ Plus family of high voltage converters | 1.0 | 1 MB |
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AN4830: 15 W, 5 V - 12 V double output, isolated flyback converter based on Viper37LE/D | 1.0 | 3 MB |
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AN4896: 15 W, 5 V output USB adapter using STCH02 | 1.0 | 2 MB |
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AN5030: 16 W, triple output, quasi-resonant flyback converter for air conditioning applications using VIPerPlus – VIPER35LD | 1.0 | 2 MB |
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AN4410: 3 W, 5 V isolated flyback converter using the VIPer06HN, from the VIPer™ plus family | 2.0 | 1 MB |
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AN4418: 3 W, 5 V isolated flyback converter using the VIPer06HS, from the VIPer™ plus family | 2.0 | 1 MB |
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AN2811: 3.5 W non-isolated offline constant-current LED driver based on VIPER17 | 1.2 | 1 MB |
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AN1439: 30 W AC-DC adapter with the L6565 quasi-resonant PWM controller | 7.0 | 301 KB |
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AN4404: 4 W, 12 V isolated flyback converter using the VIPer06HS, from the VIPer™ plus family | 2.0 | 1 MB |
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AN2753: 6 W single-output VIPer17 demonstration board | 2.1 | 1 MB |
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AN4941: 7 W dual output (-5 V/+7 V) non-isolated flyback converter with capacitive touch sensing using VIPer0P and STM32L052 | 1.0 | 3 MB |
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AN1768: ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES | 1.1 | 46 KB |
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AN4407: Advantage of the use of an added driver source lead in discrete Power MOSFETs | 2.0 | 5 MB |
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AN2025: CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION | 1.1 | 147 KB |
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AN604: Calculation of conduction losses in a power rectifier | 3.2 | 137 KB |
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AN4021: Calculation of reverse losses in a power diode | 1.0 | 120 KB |
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AN4381: Current sharing in parallel diodes | 1.0 | 449 KB |
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AN4209: Design methodology for repetitive voltage suppressors (RVS) in repetitive mode: STRVS | 2.1 | 647 KB |
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AN3028: EVLVIP16L-4WFN: 16 V / 4.5 W, 60 kHz non-isolated flyback demonstration board using the VIPer16LN | 1.0 | 1 MB |
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AN2840: EVLVIP17-5WCHG: 5 W low standby consumption battery charger demonstration board based on the VIPER17HN | 1.1 | 651 KB |
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AN4106: EVLVIP26L-12WFN: 12 V/12 W, 60 kHz non-isolated flyback | 1.0 | 3 MB |
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AN2950: EVLVIPER28L-10W: 5 V/10 W, 60 kHz isolated flyback with extra power management | 1.0 | 1 MB |
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AN4932: HVLED001A - enhanced QR high power factor flyback controller for LED drivers | 2.0 | 3 MB |
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AN1326: L6565 quasi-resonant controller | 7.3 | 543 KB |
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AN1453: NEW FAMILY OF 150V POWER SCHOTTKY | 1.1 | 131 KB |
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AN5046: Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT™ packages | 3.0 | 5 MB |
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AN5088: Rectifiers thermal management, handling and mounting recommendations | 2.0 | 2 MB |
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AN533: SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting | 3.6 | 217 KB |
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AN443: SERIES OPERATION ON FAST RECTIFIERS | 2.1 | 202 KB |
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AN2934: STEVAL-ISA062V1: 6 W, wide-range dual and single output SMPS demonstration board based on the VIPer17 | 1.0 | 1 MB |
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AN4165: STEVAL-ISA111V1: 12 V / 12 W, 115 kHz non-isolated flyback | 2.0 | 2 MB |
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AN4116: STEVAL-ISA112V1: 12 V/4 W, 115 kHz non-isolated flyback | 1.0 | 3 MB |
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AN4164: STEVAL-ISA113V1: 12 V/4 W, 115 kHz non-isolated flyback | 1.0 | 5 MB |
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AN4273: STEVAL-ISA114V1: 5 V / 0.8 W 30 kHz buck with the VIPer06XS | 3.0 | 978 KB |
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AN4562: STEVAL-ISA116V1: 5 W, 2 output wide range buck converter based on the VIPER26LD | 1.0 | 896 KB |
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AN4259: STEVAL-ISA117V1 12 V / 4.2 W, 60 kHz flyback isolated with VIPer16LN | 3.0 | 1 MB |
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AN4345: STEVAL-ISA119V1: 1.5 W double output buck product evaluation board based on the VIPER16LD | 1.0 | 2 MB |
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AN4372: STEVAL-ISA134V1: 12 V / 4 W, 115 kHz isolated flyback | 2.0 | 1 MB |
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AN4836: STEVAL-ISA174V1: VIPer0P 7 W double output non-isolated flyback | 2.0 | 4 MB |
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AN4878: STEVAL-ISA175V1 three-output isolated flyback converter for smart meter and power line communication systems based on VIPER26HD | 1.0 | 2 MB |
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AN4855: STEVAL-ISA177V1 5 V/4.25 W non-isolated flyback demo with VIPer01 | 2.0 | 8 MB |
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AN4858: STEVAL-ISA178V1 5 V/1 W 30 kHz buck demo with VIPer01 | 1.0 | 1 MB |
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AN4857: STEVAL-ISA179V1 15 V/2.25 W 60 kHz buck demo with VIPer0P | 1.0 | 1 MB |
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AN4905: STEVAL-ISA180V1 12 V/0.6 A isolated flyback demo with VIPer0P | 1.0 | 2 MB |
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AN2945: STM8S and STM32™ MCUs: a consistent 8/32-bit product line for painless migration | 1.4 | 209 KB |
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AN2872: Super wide-range buck converter based on the VIPer16 | 1.2 | 581 KB |
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AN1542: THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION | 1.1 | 57 KB |
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AN869: Tj max limit of Schottky diodes | 2.2 | 60 KB |
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AN4419: VIPER37HE: 15 W wide range single output evaluation board | 1.0 | 1 MB |
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AN2929: Wide range [90 V - 265 V] input, 5 V - 12 W output VIPER27LN demonstration board with improved standby performance | 2.0 | 1 MB |
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AN3011: Wide range input (90 - 265), single output (5 V-11 W) EVLVIP27H-12SB, VIPer27 demonstration board | 1.1 | 1 MB |
Design Notes & Tips
| Description | Version | Size | |
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DN0039: 35 W wide input range flyback converter using HVLED001A quasi resonant Flyback controller and STF10LN80K5 | 1.1 | 1 MB |
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DN0009: VIPer06X buck regulator, 12V 140 mA | 1.1 | 490 KB |
Presentations & Training Material
Publications and Collaterals
Flyers
| Description | Version | Size | |
|---|---|---|---|
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1200V SiC diodes, 2 to 40 A in surface-mount and through-hole packages | 1.0 | 748 KB |
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800-1050V MDmesh™ K5: ST’s first Super-junction VHV MOSFET Series | 1.0 | 1 MB |
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800-1700 V MDmesh K5: Very high voltage super-junction Power MOSFET series | 1.0 | 477 KB |
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Industrial-grade SiC diodes - 650V and low VF - to boost the performance of power converters | 2.0 | 958 KB |
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SOD128Flat power Schottky diodes for improved cost and space-savings | 1.0 | 2 MB |
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ST Diodes Finder : the new app for Android and iOS | 2.0 | 1 MB |
Selection Guides
| Description | Version | Size | |
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Diodes and rectifiers selection guide | 2.0 | 815 KB |
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Power MOSFET Selection Guide | 1.0 | 1 MB |
Brochures
| Description | Version | Size | |
|---|---|---|---|
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Brochure Power management guide | 10.2018 | 4 MB |
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VIPerPlus - Your SMPS design deserves a Plus | 05.2018 | 1 MB |
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VIPerPlus evaluation boards | 05.2018 | 1002 KB |
