TSM111 TRIPLE VOLTAGE AND CURRENT SUPERVISOR ■OVERVOLTAGE PROTECTION FOR 3.3V, 5V AND 12V WITHOUT EXTERNAL COMPONENTS ■ OVERCURRENT PROTECTION FOR 3.3V, 5V AND 12V WITH INTERNAL THRESHOLD VOLTAGE N DIP20 (Plastic Package) ■ POWER GOOD CIRCUITRY ■ GENERATES POWER GOOD SIGNAL ■ REMOTE ON/OFF FUNCTION ■ PROGRAMMABLE TIMING FOR POWER GOOD SIGNAL D SO20 (Plastic Micropackage) ■ 14.5V TO 36V SUPPLY VOLTAGE RANGE ■ TWO 1.6% VOLTAGE REFERENCES FOR MAIN AND AUXILIARY CONVERTER REGULATION 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. May 2001 ORDER CODE Package Part Number Temperature Range TSM111C Example : TSM111CD 0, +70°C N D • • N = Dual in Line Package (DIP) D = Small Outline Package (SO) - also available in Tape & Reel (DT) PIN CONNECTIONS (top view) Vs33 1 20 Is33 Vs5 2 19 Is5 Vs12 3 18 Is12 ADJ 4 17 Tsur 5 16 GND 6 15 FbMAIN VrefMAIN Vcc PWM REM 7 14 Trem 8 13 VrefAUX PG 9 12 FbAUX Tpor 10 11 UV 1/17 TSM111 SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VCC DC Supply Voltage pin 5 1) 44 V Iout Output Current Power Good and PWM 30 mA Pd Power Dissipation 1 W Tstg Storage Temperature Range -55 to +150 °C ESD Iin Electrostatic Discharge 2 kV Input Current 50 mA Value Unit 1. All voltages values, except differential voltage are with respect to network ground terminal. OPERATING CONDITIONS Symbol Parameter 1) VCC DC Supply Voltage pin 5 Toper Operating Free Air Temperature Range Ik Operating Cathode Current, Vrefaux and Vrefmain 15 to 36 V 0 to +70 °C 30 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 VCC is 15.2V. 2/17 TSM111 ELECTRICAL CHARACTERISTICS VCC = 16V, Tamb = 0°C to 70°C (typical values given for 25°C) Symbol Parameter Test Condition Min. Typ. Max. Unit 5 10 mA ICC Total Supply Current Vcs1 Current Sense Threshold Voltage 3.3V 46.5 50 53.5 mV Vcs2 Current Sense Threshold Voltage 5V 46.5 50 53.5 mV Vcs3 Current Sense Threshold Voltage 12V 60.5 65 69.5 mV Viscm Current Sense Input Common Mode Voltage Range VCC -2 V Vvs1 Overvoltage Sense 3.3V 4 4.2 V Vvs2 Overvoltage Sense 5V 5.8 6.1 6.4 V Vvs3 Overvoltage Sense 12V 13.4 14.2 15 V 1.22 1.26 1.3 V 2.4 2.5 2.6 V V Adj Vsur Tsur V surend Vpull PG low see note 2 3.8 Threshold Voltage, 3.3V OVP Projection ADJ Input pin 4 Thereshold Voltage (Tsur input) Tsur Timing with Determined External Components 0 33kΩ to VCC, 4.7µF to ground 21 Tsur Input Clamp Voltage Input Pulled Down Voltage for V33, V5 and V12 7 Isink = 100µA, REMOTE high ms 8 V 0.4 V VOLTAGE REFERENCE, AUXILIARY CONVERTER (Fbaux) Symbol Parameter Test Condition Reference Voltage Ir = 0.5mA, Tamb = 25°C Iaux Current Stability Ir = 0.5mA to 10mA Taux Temperature Stability Vrefaux Min. Typ. Max. Unit 2.46 2.5 2.54 V 20 mV 17 Regliaux Line Regulation 15 < VCC < 36V Ioutaux Output Sinking Current Capability Vout > 2V mV 1 mV/V 15 25 mA Min. Typ. Max. Unit 2.46 2.5 2.54 V 20 mV VOLTAGE REFERENCE, MAIN CONVERTER (Fbmain) Symbol Parameter Test Condition Reference Voltage Ir = 0.5mA, Tamb = 25°C Imain Current Stability Ir = 0.5mA to 10mA Tmain Temperature Stability Vrefmain 17 Reglimain Line Regulation 15 < VCC < 36V Ioutmain Output Sinking Current Capability Vout > 2V Resp Resm 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 mV 1 mV/V 25 mA ±15 % ±1 % 3/17 TSM111 POWER GOOD SECTION Symbol Tpor Ic Vth Vhdet Vhpor Vdet Rdet Vvs4 Parameter Turn on Delay for Power Good, Cpor = 2.2µF Tpor Delay Charging Current Tpor Delay Threshold Voltage Under Voltage Comparator Hysteresis Test Condition Ic = 20µA typ., Vth = 2V typ. Hysteresis on Tpor Voltage Detect Level UV Input pin 11 Load Resistor on Vdetect UV Input pin 11 Undervoltage Sense 5V Min. Typ. Max. 100 300 500 12 1.8 20 20 2 40 28 2.2 80 200 250 1.22 1.26 4.3 tr PG Output Rise Time CL = 100pF 1 tf PG Output Fall Time CL = 100pF 300 Vol2 Ioh2 Power Good Output Saturation Level Ic = 15mA Power Good Leakage Current Collector Vout = 5V ms µA V mV mV 1.3 20 4.1 Unit V kΩ 4.5 V µs ns 0.4 V 1 µA Max. Unit 1.8 1 1.3 V mA V 1 µA 5.25 V REMOTE On/Off Symbol Vrem Iil Vol1 Ioh1 Vih1 Trem1 Trem2 4/17 Parameter Test Condition 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 Min. Typ. 1 4.2 4 8 14 ms 16 24 34 ms 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 Vcc 5 supply Vrefmain 14 analog input Reference comparison input for main converter regulation loop. 2.5V ±1.6% Fbmain 15 analog output Output for main converter regulation loop (optocoupler) Vrefaux 13 analog input Reference comparison input for auxiliary converter regulation loop. 2.5V ±1.6% Fbaux 12 analog output Output for auxiliary converter regulation loop (optocoupler) IS33 20 analog input 3.3V overcurrent control sense input. V33 1 analog input 3.3V overvoltage control sense input. IS5 19 analog input 5V overcurrent control sense input. V5 2 analog input 5V overvoltage control sense input. IS12 18 analog input 12V overcurrent control sense input. V12 3 analog input 12V overvoltage control sense input. Adj 4 ana input Tsur 17 program. analog input Rem 7 logic input Trem 8 program. analog input 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 = 0.1µF PWM 6 logic output Output signal to control the primary side of the main SMPS through an opto-coupler. When PWM is low, the main SMPS is operational. Tpor 10 program. analog input Connected to external capacitor for Power-on-reset timing. Cpor = 2.2µF UV 11 analog input Undervoltage detection, control and detect main AC voltage failure. PG 9 logic input GND 16 supply Adjustment pin for 3.3V OVP. This pin is to be used for an OVP other than 3.3V (eg for µC 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 µC, turn off PWM after Trem delay. Rem = 0 means that the main SMPS is operational. Power Good logic output, 0 or 5V. Power Good high (=1) means that the power is good for operation. Ground or Negative supply voltage. 5/17 TSM111 APPLICATION DIAGRAM 6/17 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 2.2µF/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%. 9/17 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. When 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 Part Number Qt Manufacturers Remarks / Descriptions 1 1 1 1 1 ST ST ST ST ST Advanced PWM Controller Aux controller PWM+Mos Triple Voltage and Current Supervisor -12V Post Regulator Programmable Voltage Reference 1 1 ST ST TO220 6A, 800V Mos TO220 22mohm 33V Mos 1 3 ST ST 1 ST 1 1 1 ST - 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 1 1 1 1 1 1 1 BI Tech. ** BI Tech. BI Tech. BI Tech. BI Tech. BI Tech. - 1 - 1 Molex 1 1 1 3 1 1 Siemens Toshiba - 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 11 STSPS10L40CT 12 KAL04 13 1N4148 Transformers / Indu ctors 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 20 pin output connector with terminals Molex 39-00-0038 2.2 ohm 100% transfer ratio TSM111 ... continued BILL OF MATERIAL No Part Number Qt Capacitors No Part Number Qt Resistors 27 47UF/25V 1 52 20K 1 28 3.9NF 1 53 47K,3W 1 29 .47UF/16V 1 54 100K,1/2W 2 30 1NF 2 55 5.1K 1 31 100UF/25 1 56 3 MOHM 1 32 .22UF/250V A.C 2 57 1OR 2 33 1000UF/10V 2 58 10 MOHM 1 34 3300UF/10 1 59 4.7K 5 35 470UF/16V 2 60 68K 1 36 2.2NF 2 61 680R 1 37 2.2UF/16 1 62 39K 1 38 470UF/25V 1 63 3.1K 1 39 4.7NF 4 64 470K 1 40 47UF/16V 1 65 100R 1 41 100UF/25V 3 66 10K 4 42 100UF/25V 1 67 3.3K 1 43 47NF 3 68 5 MOHM 1 44 220UF/200V 2 69 1K 1 45 1000UF/25V 1 70 330R 1 46 2.2UF 1 71 10,1/4W 2 47 1.5NF 1 72 470R 1 48 10NF 1 73 0.68 2 49 .1UF 1 74 6.8K 2 50 3.3NF 1 51 56NF 1 ** BI Technolo les Pte Lte Phone No: 65 249-1115 Fax No: 65 445-1983 Attn: Kelvin Lim, Sales Dept 11/17 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 CON3 CN3 PS ON/OFF PW OK TSM111 R29 R27 10K 10 9 3.3K 12 C37 47nF 13 680,1/2W 10uF/35V 1 2 5 R24 F1 3.5A 1 2 S1 CN1 SW SPST CON1 A.C INPUT 100V~ 240V A.C 1nF 12/17 3 R8 6.8K R2 6.8K C6 C8 C5 56nF .1uF 1.5nF + 4 COMP VFB 11 PGND SGND STBY SS 12 13 L5991 ISEN IC3 OUT 9 6 5 4.7K IC3 L5991A 3 C16 4.7nF R9 3.3nF 7 470K C7 1nF RCT NTC .22uF/250V A.C 2.2ohm R28 C31 10 8 OPT OPT C11 2 3.9nF R16 4.7K .47uF/16V R DIS Vc Vcc .22uF/250V A.C DC LF01 14 R DC-LIM VREF + C2 VAR C1 C14 R4 10 BRIDGE R 47uF/25V 8.2K R15 5.1K C13 R5 10 47uF/25V D5 1N4148 16 10 15 Vcc 2 osc 1 4 comp IC1 VIPER20 GND 6 1N4148 + 3 4 1 2 3 R10 D1 R3 100 20V R6 470 C10 4.7nF 3 2 1 + C9 S2 SW SPST C32 220uF/16V R20 4.7K Q1 STP6NB80 R7A .22 R7A1 R7 D 1K 100K,1/2W 100K,1/2W 8 9 R11 R9 47 D4 OPT 7 8 DRAIN (out) 220uF/200V R12 TLP621 AUX TRANS D5 5 220uF/200V 4 IC2 R44 330 7 5 OPT C4 + + + 6 D8 100uF/25 BYW100-200 T2 D6 1 10K C3 C30 4.7nF TLP621 R34 10K TL431 C17 D7 470uF/16 BYW100-200 R13 BYT11-800 GND ANALOG X C35 TLP621 3 R10 4.7nF 47K IC10 470nF R L3 10uH D2 4 4.7K 470uF/16V IC5 C12 R45 PWM 2.2uF/16 10K R43 C20 4.7K 6 C28 100uF/25V IC4 OPT C18 ADJ TSM111 SUPERVISOR 17 UV Vcc D14 OPT C55 1 2 3 4 6 11 C34 R23 680 D3 16 2 10 12 10 11 8 7 5 D11 D12 STPS2045CT C21 STP1060CT C26 2.2nF 2.2nF R18 MAINS TRANS 17V IC6 R39 5mohm20 R17 10 12 9 1 1N4148 D16 BYW100-200 BYW100-200 D13 BYW100-200 BYW100-200 Gnd + + 19 D14 D15 20K R17A 3.5mohm 1000uF/10V L2 COUPLED INDUCTOR Tsur 3.3V 1 3 2 IS33 12V + 3300uF/10 18 R IS5 5V 1000uF/10V Q3 C22 STP3020 VS33 IN C24 4 VS5 OUT + R19 10mohm 1000uF/25V T1 IS12 3 C23 L6 INDUCTOR D12 VS12 14 470uF/16V L4 2.2uH C40 100uF/25V 100nF V refMAIN 470uF/25V C19 15 C25 2 L7912 VrefAUX 1K C29 GND R26 39K 47nF R 100uF/25V IC7 8 FbMAIN C C51 Trem R C38 2.2uF 33K REM R38 1K C41 Tpor R42 PG -12V 2 1 FbA UX F 5V STDBY 3.1K R22 7 4.7K R47 Q2 NPN1 TSM111 EVALUATION 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. 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=33kΩ, C1=4.7µF => 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. 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. EVALUATION BOARD - ELECTRICAL SCHEMATIC VrefAux R10 J18 OptMain 1 2 1 2 VrefMain 1 In12V 1 R8 R3 In5V 1 In3.3V 5 Fault U2 78L05 2 1 2 C7 1 2 + Vin Vout 5Vstby 3 C6 1 Out3.3V 1 PG 1 2 J11 PG From µc 1 2 J12 Rem 12 13 15 R11 FbA ux TR em VrefA ux 14 3 1INV Fbma in VrefMa in Vs 12 I Csur GND C1 1 VCC 8 PWM R6 1 2 TSM111 A dj Tsur 6 2 18 U1 4 UV 17 V cc R4 V s5 Is 12 UV Vdet Vs 33 I s5 D1 1 2 Rsur J14 Gnd Out5V 5Vstby rs3.3V 5Vstby J13 Vcc 1 rs5V R1 J8 Out12V J9 Out5V J10 Out3.3V Out12V rs12V R2 11 J2 Fault RoptMain C4 Is 33 J1 Vdet C5 R7 OptMain 20 J7 IN12V J6 In5V J5 In3.3V 1 2 Roptaux R9 G nd J15 VrefMain Optaux 16 J16 VrefAux 1 2 1 19 J3 Optaux PG Tpor Rem 9 10 7 D6 D5 R5 R rem C2 Crem C3 Cpor 1 SW12 3 4 BP Rem 5Vstby 1 2 J20 13/17 TSM111 When 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 100kΩ 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 38.8kΩ. R5 = 1kΩ 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 20µA. C3=2.2µF => Tpor=300ms When 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 20kΩ serial pull down resistor is integrated. Therefore, only a low power zener is needed. 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. 14/17 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). Example of component lists Table 1 gives an example of component list Name Type Value Comment U1 IC TSM111 DIP20 U2 IC 78L05 TO92 R1 R 1/4W R 1/2W R 1W 10mΩ 5mΩ 2.5mΩ 5A 10A 20A R2 R 1/4W R 1/2W R 1W 10mΩ 5mΩ 2.5mΩ 5A 10A 20A R3 R 1/4W R 1/2W R 1W 65mΩ 13mΩ 6.5mΩ 1A 5A 10A R4 R 1/4W 33KΩ R5 R 1/4W 1KΩ R6 R 1/4W 47KΩ R7 R 1/4W depends on opto used R8 R 1/4W 10kΩ comp. network to be fine tuned R9 R 1/4W depends on opto used R10 R 1/4W 10kΩ comp. network to be fine tuned R11 R 1/4W 47KΩ D1 Z 1/4W 15V D5 D 1/4W 1N4148 D6 D 1/4W 1N4148 C1 C Electro 4.7µF C2 C Plastic 100nF C3 C Electro 2.2µF C4 C Plastic 10NF comp. network to be fine tuned C5 C Plastic 10NF comp. network to be fine tuned C6 C Plastic 100nF C7 C Electro 10µF TSM111 Figure 2a Figure 2b 15/17 TSM111 PACKAGE MECHANICAL DATA 20 PINS - PLASTIC DIP Millimeters Inches Dim. Min. a1 B b b1 D E e e3 F I L Z 16/17 Typ. 0.254 1.39 Max. Min. 1.65 0.010 0.055 0.45 0.25 Typ. Max. 0.065 0.018 0.010 25.4 8.5 2.54 22.86 1.000 0.335 0.100 0.900 7.1 3.93 3.3 0.280 0.155 0.130 1.34 0.053 TSM111 PACKAGE MECHANICAL DATA 20 PINS - PLASTIC MICROPACKAGE (SO) Millimeters Inches Dim. Min. A a1 a2 b b1 C c1 D E e e3 F L M S Typ. Max. Min. 2.65 0.3 2.45 0.49 0.32 0.1 0.35 0.23 Typ. 0.004 0.014 0.009 0.5 Max. 0.104 0.012 0.096 0.019 0.013 0.020 45° (typ.) 12.6 10 13.0 10.65 0.496 0.394 1.27 11.43 7.4 0.5 0.512 0.419 0.050 0.450 7.6 1.27 0.75 0.291 0.020 0.299 0.050 0.030 8° (max.) Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibil ity for the consequences of use of such information nor for any infring ement of patents or other righ ts of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change witho ut notice. This publ ication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life suppo rt devices or systems withou t express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2001 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom http://www. st.com 17/17