TSM111
TRIPLE VOLTAGE AND CURRENT SUPERVISOR
sOVERVOLTAGE PROTECTION FOR 3.3V, 5V
AND 12V WITHOUT EXTERNAL COMPON ENTS
s OVERC URRENT PROTECTION FOR 3.3V,
5V AND 12V WITH INTERNAL THRESHOLD VOLTAGE
N DIP20 (Plastic Package)
s POWER GOOD CIRCUITRY s GENER ATES POWER GOOD SIGNAL s R EMOTE ON/OFF FUNCTION s PROGRAMMABLE TIMING FOR POWER
GOOD SIGNAL
s 14.5V TO 36V SUPPLY VOLTAGE RANGE s TWO 1.6% VOLTAGE REFERENCES FOR
MAIN AND AUXILIARY CONVERTER REGU LATION LOOPS DESCRIPTION The TSM111 integrated circuit incorporates all sensing circuit to control a triple output power supply. It includes voltage references , comparators and matched resistors bridge for overcurrent and overvoltage detection without the need of any external components. Timing generator with external capacitors, control turn On and Off delays. It provides an integrated and cost effective solution for simultaneous multiple voltage control. APPLICATION This circuit is designed to be used in SMPS for Desktop PC, to supervise currents and voltages of all outputs and generate power good information to the system while managing all timing during transitory operation. The IC also manages the standby mode of SMPS while the PC is in sleep mode.
D SO20 (Plastic Micropackage)
ORDER CODE
Package Part Number Temperature Range N TSM111C Example : TSM111CD 0, +70C · D ·
N = Dual in Line Package (DIP) D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (top view)
Vs33 Vs5 Vs12 ADJ Vcc PWM REM Trem PG Tpor
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
Is33 Is5 Is12 Tsur GND FbMAIN VrefMAIN VrefAUX FbAUX UV
January 2003
1/17
TSM111
SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol VCC Iout Pd Tstg ESD Iin Vter I1 I2 DC Supply Voltage pin 5 Power Dissipation Storage Temperature Range Electrostatic Discharge Input Current Minimum voltage on all pins with respect to ground terminal Maximum continuous current in all pins (except pin 5) Max peak current in all pins for latch-up free operation
1)
Parameter
Value 44 30 1 -55 to +150 2 50 -0.3 10 200
Unit V mA W C kV mA V mA mA
Output Current Power Good and PWM
1. All voltages values, except differential voltage are with respect to network ground terminal.
OPERATING CONDITIONS
Symbol VCC Toper Ik DC Supply Voltage pin 5 1) Operating Free Air Temperature Range Operating Cathode Current, Vrefaux and Vrefmain Parameter Value 15 to 36 0 to +70 30 Unit V C mA
1. The DC supply voltage must be higher than the maximum voltage applied on the 3.3, 5, 12V inputs (Is3.3, Is5, Is12) plus 2V. For example, if 13.2Vis present on the Is12 input, the minimum required value on V CC is 15.2V.
2/17
TSM111
ELECTRICAL CHARACTERISTICS VCC = 16V, Tamb = 0C to 70C (typical values given for 25C)
Symbol ICC Vcs1 Vcs2 Vcs3 Viscm Vvs1 Vvs2 Vvs3 V A dj Vsur Tsur Vsurend Vpull Parameter Total Supply Current Current Sense Threshold Voltage 3.3V Current Sense Threshold Voltage 5V Current Sense Threshold Voltage 12V Current Sense Input Common Mode Voltage Range Overvoltage Sense 3.3V Overvoltage Sense 5V Overvoltage Sense 12V Threshold Voltage, 3.3V OVP Projection ADJ Input pin 4 Thereshold Voltage (Tsur input) Tsur Timing with Determined External Components Tsur Input Clamp Voltage Input Pulled Down Voltage for V33, V5 and V12 Isink = 100A, REMOTE high 33k to VCC, 4.7F to ground see note 2 Test Condition PG low 46.5 46.5 60.5 0 3.8 5.8 13.4 1.22 2.4 4 6.1 14.2 1.26 2.5 21 7 8 0.4 Min. Typ. 5 50 50 65 Max. 10 53.5 53.5 69.5 VCC -2 4.2 6.4 15 1.3 2.6 Unit mA mV mV mV V V V V V V ms V V
VOLTAGE REFERENCE, AUXILIARY CONVERTER (Fbaux)
Symbol Vrefaux I aux T aux Regliaux Ioutaux Parameter Reference Voltage Current Stability Temperature Stability Line Regulation Output Sinking Current Capability 15 < VCC < 36V Vout > 2V 15 1 25 Test Condition Ir = 0.5mA, Tamb = 25C Ir = 0.5mA to 10mA Min. 2.46 Typ. 2.5 Max. 2.54 20 17 Unit V mV mV mV/V mA
VOLTAGE REFERENCE, MAIN CONVERTER (Fbmain)
Symbol Vrefmain Imain Tmain Reglimain Ioutmain Resp Parameter Reference Voltage Current Stability Temperature Stability Line Regulation Output Sinking Current Capability Absolute Precision of the Internal Resistor Connected to Vrefmain (39k, 10k, 5.4k) Matching of the Internal Resistors Connected to Vrefmain (39k, 10k, 5.4k) 15 < VCC < 36V Vout > 2V 15 1 25 15 Test Condition Ir = 0.5mA, Tamb = 25C Ir = 0.5mA to 10mA Min. 2.46 Typ. 2.5 Max. 2.54 20 17 Unit V mV mV mV/V mA %
Resm
1
%
3/17
TSM111
POWER GOOD SECTION
Symbol Tpor Ic Vth Vhdet Vhpor Vdet Rdet Vvs4 tr tf Vol2 Ioh2 Parameter Turn on Delay for Power Good, Cpor = 2.2F Tpor Delay Charging Current Tpor Delay Threshold Voltage Under Voltage Comparator Hysteresis Hysteresis on Tpor Voltage Detect Level UV Input pin 11 Load Resistor on Vdetect UV Input pin 11 Undervoltage Sense 5V PG Output Rise Time Test Condition Ic = 20A typ., Vth = 2V typ. Min. 100 12 1.8 20 200 1.22 Typ. 300 20 2 40 250 1.26 20 4.1 CL = 100pF 4.3 1 300 0.4 1 4.5 Max. 500 28 2.2 80 Unit ms A V mV mV V k V s ns V A
1.3
CL = 100pF PG Output Fall Time Power Good Output Saturation Level Ic = 15mA Power Good Leakage Current Collector Vout = 5V
REMOTE On/Off
Symbol Vrem Iil Vol1 Ioh1 Vih1 Trem1 Trem2 Parameter Test Condition Min. 1 Typ. Max. 1.8 1 1.3 1 4.2 4 16 8 24 5.25 14 34 Unit V mA V A V ms ms Remote On/Off Input Threshold Level Remote Input Low Driving Current Remote Ouput (PWM) Saturation Level Ic = 0.5mA Remote Output (PWM) Collector Vout = 5V Leakage Current Remote Input Voltage Level Pin 7 open Timing On to Off in to On/Off out, Cext = 100,F Timing Off to On in to On/Off out, Cext = 100nF
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TSM111
PIN DESCRIPTION
Name Pin Type Function Positive supply voltage. The DC supply voltage must be higher than the maximum voltage applied on the 3.3, 5, 12V inputs (Is3.3, Is5, Is12) plus 2V. For example, if 13.2V is present on the Is12 input, the minimum required value on VCC is 15.2V Reference comparison input for main converter regulation loop. 2.5V 1.6% Output for main converter regulation loop (optocoupler) Reference comparison input for auxiliary converter regulation loop. 2.5V 1.6% Output for auxiliary converter regulation loop (optocoupler) 3.3V overcurrent control sense input. 3.3V overvoltage control sense input. 5V overcurrent control sense input. 5V overvoltage control sense input. 12V overcurrent control sense input. 12V overvoltage control sense input. Adjustment pin for 3.3V OVP. This pin is to be used for an OVP other than 3.3V (eg for C power supply = 2.7V). When not in use, this pin should be grounded. When in use, VS33 should not be connected. Overcurrent blank-out time 20 to 30ms settable through external RC. The voltage at this pin is clamped at typically 5V. Trip voltage = 1.25V. Remote On/Off logic input for C, turn off PWM after Trem delay. Rem = 0 means that the main SMPS is operational. Connected to external capacitor to determine Trem (remote control delay) timing. Trem (on to off) is 8ms typ. Trem (off to on) is 24ms typ. Crem = 0.1F Output signal to control the primary side of the main SMPS through an opto-coupler. When PWM is low, the main SMPS is operational. Connected to external capacitor for Power-on-reset timing. Cpor = 2.2F Undervoltage detection, control and detect main AC voltage failure. Power Good logic output, 0 or 5V. Power Good high (=1) means that the power is good for operation. Ground or Negative supply voltage.
Vcc
5
supply
Vrefmain Fbmain Vrefaux Fbaux IS33 V33 IS5 V5 IS12 V12 Adj
14 15 13 12 20 1 19 2 18 3 4
analog input analog output analog input analog output analog input analog input analog input analog input analog input analog input ana input program. analog input logic input program. analog input logic output program. analog input analog input logic input supply
Tsur Rem
17 7
Trem
8
PWM Tpor UV PG GND
6 10 11 9 16
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TSM111
APPLICATION DIAGRAM
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TSM111
TIMING DIAGRAM : remote control
7/17
TSM111
TIMING DIAGRAM : overvoltage or overcurrent shut-down
8/17
TSM111
AN EXAMPLE OF 90W MICRO ATX POWER SUPPLY USING L5991A, VIPER20 AND TSM111 Protection against accidental short circuits and fault conditions is mandatory in PC power supplies. These protection circuits can be realized by using many discrete components which occupy a lot of PCB space, design time in fine tuning the circuit and also add to assembling costs. ST's single chip TSM111 IC provides complete protection circuits design easier, with fewer number of components. TSM111 is an ideal supervisor IC for PC power supplies. The salient features and benefits of this device are listed below : a) Over voltage protection for 3.3V, 5V and 12V without external component. b) Over current protection for 3.3V, 5V and 12V. c) Generates Power Good signal. d) Programmable timing for Power Good signal. e) Wide range supply operating voltage up to 36V (44V AMR). f) Stable internal voltage reference. g) Two 1.6% voltage reference for Main and Auxiliary regulation. h) Few external components. i) Circuit occupies little space on PCB. j) Easy implementation of the circuit. FEATURE DESCRIPTIONS a) Over voltage protection can be implemented without any additional components. Overvoltage sense levels for 3.3V, 5V, 12V are 4V, 6.1V, 14.2V respectively. With very little tolerances, better protection is achieved. b) Over current protection can be implemented with very small value sense resistors. As the current sense threshold levels are set very low, regulation is not affected. The current sense threshold levels for 3.3V, 5V, 12V are 50mV, 50mV and 65mV respectively. c) The power good signal (pin9) is asserted to indicate the 5V and 3.3V is above the under voltage threshold level. PG pin goes high when the above condition is reached. Pull up resistor R27 (3.1K) is connected to 5V STDBY supply from this pin. d) The timing of the power good signal can be controlled by adjusting the value of the charging capacitor on pin 10. With 2.2F/16V capacitor on pin 10, 400msec turn on delay is achieved. e) The power supply can be operated from 14.5V to 36V. The VCC must always be higher than the supply voltage on the 12V input pin by 2V .i.e. if 14V is appearing 12V input pin the Vcc must be > 16V. f) Two internal high precision TL431 shunt regulators are built-in. It provides stable reference voltages with a voltage precision of 1.6%.
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TSM111
SUPERVISORY CIRCUIT OPERATION The system power ON/OFF logic is generated by the PC, which is "Low" in system "On" condition and "High" when the system is "Off". This is connected to remote pin 7. The IC's internal logic circuit generates a control signal on pin 6. In normal operation, when there is no over voltage or over current at the three inputs, the voltage on pin 6 follows the Remote pin 7 voltage, i.e. if the remote pin 7 is low the pin 6 is also low or vice versa. W hen fault is detected on the inputs, control pin 6 goes "High". This control pin 6 output can be used to turn off the Mains Power Supply during fault condition. An optocoupler is connected directly, with cathode connected to the IC pin 6 and anode to 5V (from STDBY supply). In normal operation the voltage on pin 6 is (opto cathode) is around 3.7 V. On the primary side the opto transistor collector is pulled through a resistor to Vref. It is required to invert the signal before connecting to the feedback compensation pin 6 of L5991A for reverse logic. i.e during normal operation the compensation pin is not affected and during fault condition the pin is pulled Low. Slight delay (R34,C32) is introduced on the primary side to avoid fault turn on condition.
Note : Once the fault condition is removed, it is required to reset the Remote pin to make the system function again.
BILL OF MATERIAL The following are the bill of material for the 90W SMPS :
No ICs 1 L5991A 2 VIPer20 DIP 3 TSM111 4 LM7912CV 5 TL431 MOSFETS 6 STP6NB80 7 STP3020L Rectifiers 8 BYV10-40 9 BYW100-200 10 STPS20L40CT 1 1 1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3 1 1 ST ST ST ST ST ST ST ST ST ST ST BI Tech. ** BI Tech. BI Tech. BI Tech. BI Tech. BI Tech. Molex Siemens Toshiba 20 pin output connector with terminals Molex 39-00-0038 Advanced PWM Controller Aux controller PWM+Mos Triple Voltage and Current Supervisor -12V Post Regulator Programmable Voltage Reference TO220 6A, 800V Mos TO220 22mohm 33V Mos 1A, 40V or BYV10-60 or BYW100-200 1A, 100V or 200V, BYW100-100 2x10A, 40V or STPS2045CT or STPS30L40CT 2x5A, 40V 3Amp 400VAC Bridge Rectifier or higher Part Number Qt Manufacturers Remarks / Descriptions
11 STSPS10L40CT 12 KAL04 13 1N4148 Transformers / Inductors 12 HM00-98 150 13 HM00-98151 14 HM00-98 148 15 HM50-150K 16 HM11-51502 17 HM28-32022 18 10uH Connectors 19 AC input conn 20-pin conn: 20 39-02-2200 21 Fann connector 22 Fuse 3.5A 23 NTC 24 TLP621 Optocoupler 25 AC switch 26 115V-23oV selector 10/17
Aux Transformer Main Transformer Coupled inductors 15uH inductors - output filter 2.2uH inductors - output filter Common Mode choke - AC input filter 10uH inductors - output filter
2.2 ohm 100% transfer ratio
TSM111
... continued BILL OF MATERIAL
No Capacitors 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 47UF/25V 3.9NF .47UF/16V 1NF 100UF/25 .22UF/250V A.C 1000UF/10V 3300UF/10 470UF/16V 2.2NF 2.2UF/16 470UF/25V 4.7NF 47UF/16V 100UF/25V 100UF/25V 47NF 220UF/200V 1000UF/25V 2.2UF 1.5NF 10NF .1UF 3.3NF 56NF 1 1 1 2 1 2 2 1 2 2 1 1 4 1 3 1 3 2 1 1 1 1 1 1 1 Part Number Qt No Resistors 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 20K 47K,3W 100K,1/2W 5.1K 3 MOHM 1OR 10 MOHM 4.7K 68K 680R 39K 3.1K 470K 100R 10K 3.3K 5 MOHM 1K 330R 10,1/4W 470R 0.68 6.8K 1 1 2 1 1 2 1 5 1 1 1 1 1 1 4 1 1 1 1 2 1 2 2 Part Number Qt
** BI Technolo les Pte Lte Phone No: 65 249-1115 Fax No: 65 445-1983 Attn: Kelvin Lim, Sales Dept
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TSM111
CON3 CN3
11 12 13 14 15 16 17 18 19 20
PW OK
1 2 3 4 5 6 7 8 9 10
R29 R47 10K F R22 2 1 R 680,1/2W C38 V re fA UX C37 47nF 13 15 R42 1K R38 3.3K 33K 12 R27 3.1K 4.7KC41
10
- 12V
PG
9
2.2uF
RE M
Tp o r
7
PS ON/OF F
Tre m
12V
R26
C
R 1K C25
39K 47nF
1
S UP E RV IS OR
A DJ
+
5V
OUT
TS M111
3 .3 V
C29 2 L6 INDUCTOR L7912 C40 1000uF/25V
14 C23 R19 10mohm 1000uF/10V Q3 C22 STP3020 3
GND
470uF/25V
L4 2.2uH
470uF/16V
IN
C19 100uF/25V
3300uF/10
+
2 R17A 3.5mohm
3
1000uF/10V L2 COUPLED INDUCTOR D14 D12 D15 1N4148 D11 D12 2 C STPS2045CT1 STP1060CT 26 2.2nF 2.2nF R18
BYW100-200 BYW100-20D16 0 D13 BYW100-200 BYW100-200
17
11
5
R17
C28
10
12
T1
12
11
9
7
8
10
10
C34 R23 680 100uF/25V
17V
MAINS TRANS
D3 OPT C12 R107nF 4. 47K GND ANALOG TL431 C3 C4 D2 BYT11-800
D14 OPT C55
2.2uF/16
5V ST DBY
10uF/35V IC4
6
4
3
2
5
1
1
2
R24 10K IC5
1
C18 470uF/16V L3 10uH C35
R43 C.7K 4 20 470nF R X C17
R45 4.7K IC10
TLP621
4
3
R13 10K TLP621 R34
2
6
P WM
Tsu r
V cc
UV
4
3
Q1 STP6NB80
R7A .27A1 R2 R7 D 1K 20V R6 470 R3 100
R20 0uF/16V 22 4.7K
+
+
+
D7 470uF/16 BYW100-200
D8 00uF/25 1 BYW100-200
1
R44 330
IC2
220uF/200V
220uF/200V R12 100K,1/2W C9 S2 SW SPST D1 C17nF 4. 0
6
7
2
R11 100K,1/2W
+
Q2 NPN1
9
8
T2
D6 OPT AUX TRANS D5 OPT
TLP621
4
3
R10 10
5
3
2
1
+
R9 47 D4 1N4148
47uF/25V R4 10
R5 10
C11 1nF
C7 3.3nF
D5 1N4148
+
10
13
12
11
8
V cc
2
7 8 DRA IN (o u t)
L 5 9 9 1 IS E N
V IP E R2 0
IC1
4 co mp
C1 C14 3.9nF R16 NTC .22uF/250V A.C 2.2ohm R28 470K F1 3.5A
C31
DC-L IM V RE F
6
IC3
47uFR 5V /2 8.2K R15 5.1K C13
S GND
P GND
R LF01 .22uF/250V A.C R OPT OPT
o sc 1
14
DIS V c V cc
S TB Y
15
RCT
5
GND
16
7
4
3
C16
3
1nF
A .C INP UT 1 0 0 V ~ 2 4 0 V A .C
R8 6.8K
R2 6.8K C6 .1uF C8 C5 56nF 1.5nF
S1 CN1 SW SPST CON1
12/17
1 2
2
5
4.7K .47uF/16V
4.7nF R9 4.7K
V FB
DC
SS
COMP
OUT
C2 VAR
9
6
BRIDGE
IC3 L5991A
+
IS 3 3
R39 5mohm 0 2
VS3 3
1
Gn d
IS 5
19
IC6
+
IS 1 2
C24
18
V re fMA IN
100uF/25V IC7
Fb MA IN
Fb A UX VS1 2 VS5
C51 8 100nF
4
R 20K
+
16
C30 4.7nF C32
10K
TSM111
EVALU ATION BOARD - TECHNICAL NOTE TSM111 is a Housekeeping IC which is best used in PC Switch Mode Power Supplies for secondary 3.3V, 5V, and 12V power lines protection. TSM111 integrates all the necessary functions for a secure and reliable overcurrent and overvoltage protection, as well as a logic interface for proper communication with the motherboard and adjustable timing circuitry for optimized sequencing management. Moreover, TSM111 integrates two precise shunt voltage references for direct optocoupler drive. TSM111, integrating the equivalent of more than 25 discrete components, saves a lot of design time and fine tuning, as well as PCB area, and increases the reliability of the whole application. How to use the TSM111 Evaluation Board ? This evaluation board allows to adapt the TSM111 housekeeping chip to an already existing PC Power Supply by simply choosing proper values for it's external components, and making the adequate connections to the I/O of the evaluation board. The Electrical Schematic of the TSM111 evaluation board is shown on figure 1. It includes the TSM111 as well as the minimum component number required to make the TSM111 fit in a PC SMPS application. Components calculations The overvoltage protection is not to be adjusted. Internal voltage thresholds are given by Vvs1, Vvs2, Vvs3 for respective protection of the 3.3V, 5V, 12V power lines. The overcurrent protection is given by the choice of the Sense resistors R1, R2, R3 (respectively for each power line 3.3V, 5V, 12V). Internal precise voltage thresholds define the tripping voltage drops for each line following equations 1, 2 & 3 : Vcs1 = R1 x I33 eq1 Vcs2 = R2 x I5 eq2 Vcs3 = R3 x I12 eq3 where I33, I5, and I12 are the tripping currents. The system will latch (Fault output will be active high) if the overcurrent lasts more than the authorized surge delay Tsur given by equations 4 & 5 : Icharge = Vcc / R4 eq4 Tsur = (C1 x Vsur) / Icharge eq5 Note that eq4 is an approximation of a capacitive charge where Vcc (16V min) is large versus the threshold voltage Vsur (2.5V). R4=33k, C1=4.7F => Tsur=21ms Thanks to the Tsur adjustment, the normal surge currents which occur during power up (capacitive oads charging) are blanked for a time depending on each application.
EVALUATION BOARD - ELECTRICAL SCHEMATIC
J3 Optaux J16 VrefAux J15 VrefMain J7 IN12V J6 In5V J5 In3.3V J1 Vdet R9 R10
VrefAux
Roptaux C5 RoptMain C4
1 2
Optaux
1 2
J18 OptMain
1 2 VrefMain
1 2
OptMain
R7
R8 R3 R2 R1 rs3.3V
1 19
14 15 20 2 18 13 12 Out12V 1
1
In12V
rs12V
Out5V 1
1
In5V
rs5V
Out3.3V 5Vstby 1
1
In3.3V
J8 Out12V J9 Out5V J10 Out3.3V
T R e m V re f A u x
V re f M a in
Vdet 5Vstby
F b m a in
Fb A u x
Vs33 Is5
Is3 3
V s5 Is1 2
V s1 2
1 2
D1 R4
R11
9 10 7 PG 1 2
UV
11 17 6
3
PG
UV Tsur PWM
U1
V cc 5
TSM111
Gnd Adj 16 4
Tpor Rem
J11 PG J12 Rem
Rsur J2 Fault J13 Vcc J14 Gnd R6
1 2 VCC 1 2 Fault
D6
From c 1 2
8
C1
I
Csur
2 +
R5 R rem C2 Crem C3 Cpor
D5
1 3
U2 78L05
G ND Vin Vout
1INV
SW1 2
4
5Vstby
5Vstby 3
C7
1 2
C6
1
BP Rem
1 2
J20
13/17
TSM111
W hen the system has latched (either after overcurrent or overvoltage condition), the system needs to be reset via the Remote input. The C2 capacitor determines two different timings to the Fault output : C2=100nF => Trem1(ON to OFF)=8ms C2=100nF => Trem2(OFF to ON)=24ms R5 is a pull down resistor on the remote pin of TSM111. Note that an integrated pull up resistor of 100k is to be taken into account in the choice of R5, knowing that the threshold voltage of the input comparator is 1.4V. Therefore, R5 should be lower than 38.8k. R5 = 1k is a good value. The evaluation board integrates the possibility to make the Remote signal either manual, or electronic thanks to the ORing diodes D5 and D6 (and the pull down resistor R5), and the Push Button (SW1). These diodes can of course be replaced by straps according to the evaluation requirements (manual or electronic). The Tpor delay time allows the PG output (Power Good) to rise to high level when the 5V power line internal supervision circuitry has stayed above the undervoltage 4.3V threshold for more than Tpor time following the approximated equation 6 : C3 x Vth = Ic x Tpor eq6 where Vth is 2V and Ic is 20A. C3=2.2F => Tpor=300ms W hen the 5V power line passes under the 4.3V undervoltage threshold, the Power Good signal (PG) falls immediately to low level. The Power Good output can also be triggered by the Vdet input of the board. This input should be connected to a power line representative of the AC mains power situation. As an example, an additional winding on the auxiliary power supply offer an early warning of power down from the mains power point of view. The UV threshold is internally fixed to Vdet=1.26V. Therefore, it is necessary to add a zener diode D1. D1=15Vzener => Vdet=16.26V Note that a 20k serial pull down resistor is integrated. Therefore, only a low power zener is neede d. The Fault output needs a pull up resistor R6. The Power Good output needs a pull up resistor R11. Both signals are pulled up to the 5Vstandby power supply which can be generated from the evaluation board thanks to a 78L05 5V regulator. This regulator needs a C6 bypass capacitor. The C7 bypass capacitor smoothens the VCC pin of TSM111. The Adj (Adjust) pin should be connected to ground. Adjust allows to tune a new overvoltage protection value (ex 2.7V instead of 3.3V). Exam ple of component lists Table 1 gives an example of component list
Name U1 U2 R1 IC IC R 1/4W R 1/2W R 1W R 1/4W R 1/2W R 1W R 1/4W R 1/2W R 1W R 1/4W R 1/4W R 1/4W R 1/4W R 1/4W R 1/4W R 1/4W R 1/4W Z 1/4W D 1/4W D 1/4W C Electro C Plastic C Electro C Plastic C Plastic C Plastic C Electro Type Value TSM111 78L05 10m 5m 2.5m 10m 5m 2.5m 65m 13m 6.5m 33K 1K 47K depends on opto used 10k comp. network to be fine tuned depends on opto used 10k comp. network to be fine tuned 47K 15V 1N4148 1N4148 4.7F 100nF 2.2F 10NF comp. network to be fine tuned 10NF comp. network to be fine tuned 100nF 10F Comment DIP20 TO92 5A 10A 20A 5A 10A 20A 1A 5A 10A
R2
R3 R4 R5 R6 R7 R8 R9 R10 R11 D1 D5 D6 C1 C2 C3 C4 C5 C6 C7
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TSM111
Figure 2a Figure 2b
15/17
TSM111
PACKAGE MECHANICAL DATA 20 PINS - PLASTIC DIP
Millimeters Dim. Min. a1 B b b1 D E e e3 F I L Z 0.254 1.39 0.45 0.25 25.4 8.5 2.54 22.86 7.1 3.93 3.3 1.34 Typ. Max. 1.65 Min. 0.010 0.055
Inches Typ. Max. 0.065 0.018 0.010 1.000 0.335 0.100 0.900 0.280 0.155 0.130 0.053
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TSM111
PACKAGE MECHANICAL DATA 20 PINS - PLASTIC MICROPACKAGE (SO)
Millimeters Dim. Min. A a1 a2 b b1 C c1 D E e e3 F L M S 0.1 0.35 0.23 0.5 45 (typ.) 12.6 10 1.27 11.43 7.4 0.5 7.6 1.27 0.75 8 (max.) 0.291 0.020 13.0 10.65 0.496 0.394 Typ. Max. 2.65 0.3 2.45 0.49 0.32 Min. 0.004 0.014 0.009
Inches Typ. Max. 0.104 0.012 0.096 0.019 0.013 0.020 0.512 0.419 0.050 0.450 0.299 0.050 0.030
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