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 POWER GOOD CIRCUITRY GENERATES POWER GOOD SIGNAL REMOTE ON/OFF FUNCTION PROGRAMMABLE TIMING FOR POWER GOOD SIGNAL 14.5V TO 36V SUPPLY VOLTAGE RANGE TWO 1.6% VOLTAGE REFERENCES FOR MAIN AND AUXILIARY CONVERTER REGULATION LOOPS N DIP20 (Plastic Package) D SO20 (Plastic Micropackage) ORDER CODES Part Number Package Temperature Range N D 0, +70oC • • TSM111C Example : TSM111CD DESCRIPTION The TSM111 integrated circuit incorporates all sensing circuit to control a triple output power supply. It includes voltage references , comparatorsand matched resistors bridge for overcurrent and overvoltage detection without the need of any external components.Timing generatorwith externalcapacitors, control turn On and Off delays. It provides an integrated and cost effective solution for simultaneous multiple voltage control. APPLICATIONS This circuit is designedto be used in SMPS forDesktop 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 1999 PIN CONNECTIONS (top view) Vs33 1 20 Is33 Vs5 2 19 Is5 Vs12 3 18 Is12 ADJ 4 17 Ts ur Vcc 5 16 GND P WM 6 15 FbMAIN REM 7 14 VrefMAIN Tre m 8 13 VrefAUX PG 9 12 FbAUX Tpor 10 11 UV 1/18 TSM111 SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VCC DC Supply Voltage pin 5 - note 1 44 V Iout Output Current Power Good and PWM 30 mA Pd Power Dissipation 1 Tstg Storage Temperature Range ESD Electrostatic Discharge 2 kV Input Current 50 mA Iin Note : 1. -55 to +150 W o C Al l vol tages val ues, except dif ferenti al voltage, are w ith respect to netw ork ground terminal. OPERATING CONDITIONS Symbol Parameter Value VCC DC Supply Voltage pin 5 - note 2 15 to 36 Toper Operating Free Air Temperature Range 0 to +70 Ik Note : 2/18 Operating Cathode Current, Vrefaux and Vrefmain 30 2. The D C supply voltage must be higher than t he maxi mum vol tage applied on the 3.3, 5, 12V inputs (I s3.3, Is5, Is12) plus 2V. For example, if 13.2V is present on the I s12 input, the mi nimum required value on V CC is 15.2V . Unit V o C mA TSM111 ELECTRICAL CHARACTERISTICS VCC = 16V, Tamb = 0oC to 70oC (typical values given for 25oC) Symbol Parameter Test Condition Min. Typ. Unit ICC Total Suppy Current 5 10 mA 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 3.8 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 VAdj Threshold Voltage, 3.3V OVP Protection. ADJ input pin4 1.22 1.26 1.3 V Vsur Threshold voltage (Tsur input) 2.4 2.5 2.6 Tsur Tsur Timing with Determined External Components Vsurend Vpull PG Low Max. see note 2 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 V ms 8 V 0.4 V VOLTAGE REFERENCE, AUXILIARY CONVERTER (Fbaux) Symbol Parameter Test Condition o Reference Voltage Ir = 0.5mA, Tamb = 25 C Iaux Current Stability Ir = 0.5mA to 10mA Taux Temperature Stability Vrefaux Regliaux Line Regulation 15 < VCC < 36V Ioutaux Output Sinking Current Capability Vout > 2V Min. Typ. Max. Unit 2.46 2.5 2.54 V 20 mV 17 mV 1 mV/V 15 25 mA Min. Typ. Max. 2.46 2.5 2.54 V 20 mV VOLTAGE REFERENCE, MAIN CONVERTER (Fbmain) Symbol Parameter Test Condition o Reference Voltage Ir = 0.5mA, Tamb = 25 C Imain Current Stability Ir = 0.5mA to 10mA Tmain Temperature Stability Vrefmain 17 Unit mV Line Regulation 15 < VCC < 36V Ioutmain Output Sinking Current Capability Vout > 2V Resp Absolute Precision of the Internal Resistor Connected to Vrefmain (39k, 10k, 5.4k) Resm Matching of the Internal Resistors Connected to Vrefmain (39k, 10k, 5.4k) +-1 % Reglimain 15 1 mV/V 25 mA +-15 % 3/18 TSM111 POWER GOOD SECTION Symbol Tpor Parameter Turn on Delay for Power Good, Cpor = 2.2µF Test Condition Ic = 20µA typ., Vth = 2V typ. Min. Typ. Max. Unit 100 300 500 ms 20 28 µA Ic Tpor Delay Charging Current 12 Vth Tpor Delay Threshold Voltage 1.8 2 2.2 V Vhdet Under Voltage Comparator Hysteresis 20 40 80 mV Vhpor Hysteresis on Tpor 200 250 Vdet Voltage Detect Level UV Input pin 11 1.22 1.26 Rdet Load Resistor on Vdetect UV Input pin 11 Vvs4 mV 1.3 20 Undervoltage Sense 5V 4.1 4.3 V kΩ 4.5 V tr PG Output Rise Time C L = 100pF 1 µs tf PG Output Fall Time CL = 100pF 300 ns Vol2 Power Good Output Saturation Level Ic = 15mA 0.4 V Ioh2 Power Good Leakage Current Collector Vout = 5V 1 µA Max. Unit 1.8 V REMOTE On/Off Symbol Vrem Iil Parameter Test Condition Remote On/Off Input Threshold Level Min. Typ. 1 1 mA Vol1 Remote Input Low Driving Current Remote Output (PWM) Saturation Level Ic = 0.5mA 1.3 V Ioh1 Remote Output (PWM) Collector Leakage Current Vout = 5V 1 µA Pin 7 open Vih1 Remote Input Voltage Level 5.25 V Trem1 Timing On to Off in to On/Off out, Cext = 100nF 4 8 14 ms Trem2 Timing Off to On in to On/Off out, Cext = 100nF 16 24 34 ms 4/18 4.2 TSM111 PIN DESCRIPTION Name Pin Type Function 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. 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 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 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. Tsur 17 program. analog input 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. 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 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. 5/18 TSM111 APPLICATION DIAGRAM 6/18 TSM111 TIMING DIAGRAM : remote control 7/18 TSM111 TIMING DIAGRAM : overvoltage or overcurrent shut-down 8/18 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 protectionfor 3.3V,5V and12V 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 voltageprotectioncan be implementedwithout 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 protectioncan 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. A COMPLETE PC SMPS SECONDARY SUPERVISOR 9/18 TSM111 f) Two internal high precision TL431 shunt regulators are built-in. It providesstable referencevoltages with a voltage precision of 1.6%. 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 generatesa 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 con- 10/18 dition. 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 conditi on is removed, it is required to reset the Remote pin to make the system functi on again. TSM111 BILL OF MATERIAL The following are the bill of material for the 90W SMPS : No Part Number Qt Manufacturers Remarks/Descirptions ICs 1 L5991A 1 ST Advanced PWM Controller 2 VIPer20DIP 1 ST Aux controller PWM+Mos 3 TSM111 1 ST Triple Voltage and Current Supervisor 4 LM7912CV 1 ST -12V Post Regulator 5 TL431 1 ST Programmable Voltage Reference 6 STP6NB80 1 ST TO220 6A, 800V Mos 7 STP3020L 1 ST TO220 22mohm 30V Mos 8 BYV10-40 1 ST 1A, 40V or BYV10-60 or BYW100-200 MOSFETs Rectifiers 9 BYW100-200 3 ST 1A, 100V or 200V, BYW100-100 10 STPS20L40CT 1 ST 2x10A, 40V or STPS2045CT or STPS30L40CT 11 STSPS10L40CT 1 ST 2x5A, 40V 12 KAL04 1 - 13 1N4148 1 - 3Amp 400VAC Bridge Rectifier or higher Transformers / Inductors 12 HM00-98150 1 BI Tech.** Aux Transformer 13 HM00-98151 1 BI Tech. Main Transformer 14 HM00-98148 1 BI Tech. Coupled inductors 15 HM50-150K 1 BI Tech. 15uH inductors - output filter 16 HM11-51502 1 BI Tech. 2.2uH Inductors - output filter 17 HM28-32022 1 BI Tech. Common Mode choke - AC input filter 18 10uH 1 - 19 AC input conn 1 - 20 20-pin conn: 39-01-2200 1 Molex 21 Fann connector 1 - 22 Fuse 3.5A 1 - 23 NTC 1 Siemens 2.2 ohm 24 TLP621 Optocoupler 3 Toshiba 100% transfer ratio 25 AC switch 1 - 26 115V-230V selector 1 - 10uH inductors - output filter Connectors 20pin output connector with terminals Molex 39-00-0038 11/18 TSM111 .... continued BILL OF MATERIAL No Part Number Qt No Capacitors Qt 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 ies Pte Lte Phone No: 65 249-1115 F ax No: 65 445-1983 Attn: Kelvi n Lim, Sales Dept 12/18 Part Number Resistors TSM111 1 2 3 4 5 6 7 8 9 1 CON3 0 CN3 P 1 11 12 13 41 15 61 17 81 92 0 WO K P SO N / O F F R29 4.7K R47 R27 10K 3.1K R22 F 2 1 R42 R38 1K 3.3K 9 33K 1 0 FbAUX P G 12 - 1 2 V C38 R26 C 1 2 V 1 100uF/25V IC7 39K 47nF R 1K + 5 V 2 GND I N 15 FbMAIN 3 . 3 V VrefMAIN 1000uF/10V Q3 C22 + STP3020 3300uF/10 D11 STPS2045CT R17 T17 R39 5mohm C26 2.2nF 1 1 1 2 R23 680 MAINS TRANS 1 7 V 6 4 2D3 3 U V 1 1 5 C34 10 1 0 16 G n d IS33 20 V c c D12 C21 STP1060CT 2.2nF R18 10 8 VS33 1 1N4148 1 2 IS5 19 D14 D15 I C 6 VS5 2 R17A 3.5mohm 1000uF/10V D16 BYW100-200 T s u r 1 7C28 D14 OP T C55 2.2uF/16 10uF/35V IC4 OP T 1 R24 2 10K C12 R43 C20 4.7K 470uF/16V D2 470nF R L3 10uH C35 R13 BYT11-800 GND ANALOG C3 + IC2 R44 6 1 Q1 STP6NB80 C9 8 4 TLP621 T2 S2 SW SPST 3 OPT 3 2 D1 1 OP T + 1N4148 2 V c c 8 7 R15 5.1K o s1 c C2 .22uF/250V A.C 5 3.9nF R16 4.7K NTC 2.2ohm 1 4 C31 .22uF/250V A.C 4.7nF R9 R28 .47uF/16V 4.7K 470K C16 3 R8 6.8K F1 3.5A 9 OPT OPT G N D 1nF R C1 Q2 NPN1 C7 1nF 8 R LF01 C11 1 0 1 3 3.3nF 1 2 1 1 6 VAR C13 4 c o m pC14 R5 10 R4 10 BRIDGE R 47uF/25V 8.2K D R IA C(I 1oVN uI tP )E R 2 0 6 47uF/25V D5 1N4148 + R6 470 + 10 R9 47 D4 R3 100 20V C10 4.7nF R10 AUX TRANS D5 .22 R7A1 R7 D 1K 100K,1/2W 100K,1/2W D6 C32 R20220uF/16V 4.7K R7A 220uF/200V R12 R11 2 330 + 220uF/200V 7 5 R34 C4 + D8100uF/25 BYW100-200 9 C30 4.7nF 4TLP621 3 10K 10K C17 + 2 3 TL431 X D7 470uF/16 BYW100-200 4 TLP621 R104.7nF 47K IC10 IC5 1 R45 4.7K P W M 6 100uF/25V 1 5 5 V S C18 T D B Y 20K IS12 18 + BYW100-200 R 4 A D J T S M 1 1 1 S U P E R V I S O R L2 COUPLEDINDUCTOR 9 100nF VS12 3 100uF/25V BYW100-200 D13 BYW100-200 C51 T r e m R19 10mohm 1000uF/25V D12 R E M 8 14 C24 + C19 VrefAUX C23 C40 L7912 C37 47nF 13 470uF/16V L4 2.2uH 470uF/25V L6 INDUCTOR 3 7 C25 C29 O U T 2.2uF T p o r R 680,1/2W C41 IC3 L5991A V cV c c O U TI S E N S G PN GD CN OD M P D I S I C L3 5 9 9 1 1 5 D C - L I M V R DE CF R C T 4 3 S T B S S Y V F B 1 6 7 2 5 R2 6.8K C6 C8 C5 56nF .1uF S1 CN1 SWSPST CON1 1.5nF A . IC N P U T 1 0 0 2V 4~A0 .V C 1 2 13/18 TSM111 EVALUATION BOARD - TECHNICAL NOTICE 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 eachpower line 3.3V, 5V, 12V). Internalprecise 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 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 necessaryfunctions 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 housekeepingchip 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 J3 Optaux 1 2 Optaux J16 VrefAux 1 2 VrefAux J15 VrefMain J7 IN12V J6 In5V J5 In3.3V J1 Vdet R10 J18 OptMain 1 2 VrefMain 1 In12V 1 In5V 1 1 2 C4 D1 2 0 5Vstby J13 Vcc J14 Gnd 14/18 1 1 9 2 1 8 1 Out5V 1 Out3.3V 1 PG 1 2 J11 PG 1 2 J12 Rem R11 1 41 51 31 2 UV R4 Rsur I s 5 V s 3 3 I s 3 3 UV 17 V I s s5 1 2 U1 Tsur PG TSM111 PWM V c c 5 G n d A d j 4 1 6 I C1 Csur U2 78L05 2 1 2 C7 + Vin Vout G N D 1 5Vstby 3 C6 9 V s 1 2 F b m Fae ibf nAA10uu xx V r e fV MrTpor a i n Rem 6 Fault VCC 3 1INV 7 D6Fro m c T R e m 8 D5 R5 R rem C2 Crem J8 Out12V J9 Out5V J10 Out3.3V Out12V 5Vstby R6 1 2 R3 rs12V R2 rs5V R1 rs3.3V Vdet 1 2 RoptMain R8 In3.3V 1 2 C5 R7 OptMain 11 J2 Fault Roptaux R9 C3 Cpor 1 3 SW15Vstby 2 4 BP Rem 1 2 J20 TSM111 loads charging) are blankedfor a time dependingon each application. 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 theRemote signaleither 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. ThePower 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 needsa C6 bypass capacitor. The C7 bypass capacitor smoothens the VCC pin of TSM111. The Adj (Adjust) pin shouldbe connectedto 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 U1 U2 R1 R4 R5 R6 R7 R8 Type 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 R9 R10 R 1/4W R 1/4W R11 D1 D5 D6 C1 C2 C3 C4 R 1/4W Z 1/4W D 1/4W D 1/4W C Electro C Plastic C Electro C Plastic C5 C Plastic C6 C7 C Plastic C Electro R2 R3 Value Comment TSM111 DIP20 78L05 TO92 10mΩ 5A 5mΩ 10A 2.5mΩ 20A 10mΩ 5A 5mΩ 10A 2.5mΩ 20A 65mΩ 1A 13mΩ 5A 6.5mΩ 10A 33kΩ 1kΩ 47kΩ depends on opto used 10kΩ comp. network to be fine tuned depends on opto used 10kΩ comp. network to be fine tuned 47kΩ 15V 1N4148 1N4148 4.7µF 100nF 2.2µF 10NF comp. network to be fine tuned 10NF comp. network to be fine tuned 100nF 10µF Figures 2a and 2b show the copper and silkscreen sides of the Evaluation board PCB. Note that it is not a 1/1 scale. 15/18 TSM111 Figure 2a 16/18 Figure 2b TSM111 PACKAGE MECHANICAL DATA 20 PINS -PLASTIC DIP Dimensions a1 B b b1 D E e e3 F I L Z Min. 0.254 1.39 Millimeters Typ. Max. 1.65 0.45 0.25 Min. 0.010 0.055 Inches 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 17/18 TSM111 PACKAGE MECHANICAL DATA 20 PINS -PLASTIC MICROPACKAGE (SO) Dimensions A a1 a2 b b1 C c1 D E e e3 F L M S Min. Millimeters Typ. 0.1 0.35 0.23 Max. 2.65 0.3 2.45 0.49 0.32 Min. Inches Typ. 0.004 0.014 0.009 0.5 Max. 0.104 0.012 0.096 0.019 0.013 0.020 o 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 8o (Max.) Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights 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 without noti ce. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST log o is a trademark of STMicroelectronics 1999 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com 18/18