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| SG1543/SG2543/SG3543 POWER SUPPLY OUTPUT SUPERVISORY CIRCUIT DESCRIPTION This monolithic integrated circuit contains all the functions necessary to monitor and control the output of a sophisticated power supply system. Over-voltage (O.V.) sensing with provision to trigger an external SCR "crowbar" shutdown; an under-voltage (U.V.) circuit which can be used to monitor either the output or to sample the input line voltage; and a third op amp/comparator usable for current sensing (C.L.) are all included in this IC, together with an independent, accurate reference generator. Both over and under-voltage sensing circuits can be externally programmed for minimum time duration of fault before triggering. All functions contain open collector outputs which can be used independently or wire-ORed together; and although the SCR trigger is directly connected only to the over-voltage sensing circuit, it may be optionally activated by any of the other outputs, or from an external signal. The O.V. circuit also includes an optional latch and external reset capability. The current sense circuit may be used with external compensation as a linear amplifier or as a high gain comparator. Although nominally set for zero input offset, a fixed threshold may be added with an external resistor. Instead of current limiting, this circuit may also be used as an additional voltage monitor. The reference generator circuit is internally trimmed to eliminate the need for external potentiometers and the entire circuit may be powered directly from either the output being monitored or from a separate bias voltage. FEATURES * Over-voltage, under-voltage, and current sensing circuits all included * Reference voltage trimmed to 1% accuracy * SCR "Crowbar" drive of 300mA * Programmable time delays * Open-collector outputs and remote activation capability * Total standby current less than 10mA HIGH RELIABILITY FEATURES - SG1543 Available to MIL-STD-883 and DESC SMD LMI level "S" processing available BLOCK DIAGRAM 11/91 Rev 1.1 2/94 Copyright (c) 1994 1 11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570 LINFINITY Microelectronics Inc. SG1543/SG2543/SG3543 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Supply Voltage (+VIN)................................................. 40V Sense Inputs ...................................................................... +VIN SCR Trigger Current (Note 2) ......................................... 300mA Indicator Output Voltage ..................................................... 40V Indicator Output Sink Current .......................................... Operating Junction Temperature Hermetic (J, L Packages) ............................................ Plastic (N, DW Packages) ........................................... Storage Temperature Range ............................ -65C to 50mA 150C 150C 150C Note 1. Values beyond which damage may occur. Note 2. At higher input voltages, a dissipation limiting resistor, RG , is required. See Figure 1. THERMAL DATA J Package: Thermal Resistance-Junction to Case, JC .................. 30C/W Thermal Resistance-Junction to Ambient, JA .............. 80C/W N Package: Thermal Resistance-Junction to Case, JC .................. 40C/W Thermal Resistance-Junction to Ambient, JA ............. 65C/W DW Package: Thermal Resistance-Junction to Case, JC ................... 40C/W Thermal Resistance-Junction to Ambient, JA ............. 95C/W L Package: Thermal Resistance-Junction to Case, JC .................. 35C/W Thermal Resistance-Junction to Ambient, JA ............ 120C/W Note A. Junction Temperature Calculation: TJ = TA + (PD x JA). Note B. The above numbers for JC are maximums for the limiting thermal resistance of the package in a standard mounting configuration. The JA numbers are meant to be guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient airflow. RECOMMENDED OPERATING CONDITIONS (Note 3) Input Supply Voltage (+VIN ) .................................... 4.7V to 40V Current Limit Common Mode Input Voltage Range ....................................... 0V to +VIN -3V Reference Load Current ........................................... 0 to 10mA Indicator Output Voltage ......................................... 4.7V to 40V Indicator Output Current ........................................... 0 to 10mA Delay Timing Capcitor (Note 4) ..................................... 0 to 1F Operating Ambient Temperature Range SG1543 ......................................................... -55C to 125C SG2543 ........................................................... -25C to 85C SG3543 .............................................................. 0C to 70C Note 3: Range over which the device is functional. Note 4. Larger value capacitor may be used with peak current limiting. See Figure 7. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1543 with -55C TA 125C, SG2543 with -25C TA 85C, SG3543 with 0C TA 70C, and +VIN = 10V. Indicator outputs have 2K pull-up resistor. Low duty cycle testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter Supply Section Input Voltage Range Supply Current Reference Section Output Voltage Line Regulation Load Regulation Short Circuit Current Temperature Stability Test Conditions TJ = 25C to TMAX +VIN = 40V, Outputs open, TJ = 25C TJ = 25C +VIN = 5 to 30V IREF = 0 to 10mA VREF = 0V SG1543/2543 SG3543 Units Min. Typ. Max. Min. Typ. Max. 4.5 4.7 7 40 40 10 4.5 4.7 7 40 40 10 V V mA V V mV mV mA %/C 2.48 2.50 2.52 2.45 2.50 2.55 2.55 2.40 2.60 2.45 1 5 1 5 1 10 1 10 12 25 40 12 25 40 .005 .005 11/91 Rev 1.1 2/94 Copyright (c) 1994 2 11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570 LINFINITY Microelectronics Inc. SG1543/SG2543/SG3543 ELECTRICAL CHARACTERISTICS Parameter Comparator Section Input Threshold (Note 5) Input Hysteresis Input Bias Current Delay Saturation Delay High Level Delay Charging Current Indicate Saturation Indicate Leakage Propagation Delay TJ = 25C Sense input = 0V (continued) Test Conditions SG1543/2543 SG3543 Units Min. Typ. Max. Min. Typ. Max. 2.45 2.50 2.55 2.40 2.50 2.60 2.40 2.60 2.35 2.65 25 25 0.3 1.0 0.3 1.0 0.2 0.5 0.2 0.5 6 8 8 6 200 250 300 200 250 300 0.2 0.5 0.2 0.5 .01 1.0 0.1 1.0 400 10 100 12 200 13 0 0.4 2 0.4 2 400 300 500 400 0.1 0.8 6 0.8 6 100 12 400 10 200 13 0 0.4 2 0.4 2 400 300 500 400 V V mV A V V A V A ns ms mA V 0.1 V mA 0.8 6 V 0.8 mA 6 V mA/s ns ns V A mV mV dB dB V A MHz ns VD = 0V IL = 10mA VIND = 40V VO.V. INPUT = 2.7V, VU.V. INPUT = 2.3V , TJ = 25C CD = 0 CD = 1F +VIN = 5V, RG = 0, VO = 0 +VIN = 15V, IO = 100mA +VIN = 40V, RL = 1K REM. ACT. pin = Gnd REM. ACT pin open RESET pin = Gnd, REM. ACT. = Gnd RESET pin open, REM. ACT. = Gnd RL = 50, TJ = 25C, CD = 0 VREM. ACT. = 0.4V VO.V. INPUT = 2.7V SCR Trigger Section Peak Output Current Peak Output Voltage Output Off Voltage Remote Activate Current Remote Activate Voltage Reset Current Reset Voltage Output Current Rise Time Prop. Delay from REM. ACT. Pin Prop. Delay fom O.V. INPUT Pin Current Limit Section Input Voltage Range Input Bias Current Input Offset Voltage CMRR AVOL Output Saturation Output Leakage Small Signal Bandwidth Propagation Delay 0 OFFSET/COMP pin open, V CM = 0V OFFSET/COMP pin open, V CM = 0V, 10k from OFFSET/COMP pin to Gnd,TJ =25C 0 VCM 12V, VIN = 15V OFFSET/COMP pin open, V CM = 0V IL = 10mA VIND = 40V AV = 0dB, TJ = 25C VOVERDRIVE = 100mV, TJ = 25C 0.3 0 100 70 80 0.2 .01 5 200 VIN-3V 0 0.3 0 100 70 80 0.2 .01 5 200 VIN -3V 80 60 72 1.0 10 120 70 60 72 1.0 15 130 0.5 1.0 0.5 1.0 Note 5. Input voltage rising on O.V. Input and falling on U.V. Input. CHARACTERISTIC CURVES FIGURE 1. SCR TRIGGER POWER LIMITING FIGURE 2 . ACTIVATION DELAY VS. CAPACITOR VALUE 11/91 Rev 1.1 2/94 Copyright (c) 1994 3 11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570 LINFINITY Microelectronics Inc. SG1543/SG2543/SG3543 CHARACTERISTIC CURVES (continued) FIGURE 3. COMPARATOR INPUT HYSTERESIS FIGURE 4. CURRENT LIMIT INPUT THRESHOLD FIGURE 5. CURRENT LIMIT AMPLIFIER GAIN FIGURE 6. CURRENT LIMIT AMPLIFIER FREQUENCY RESPONSE APPLICATION INFORMATION FIGURE 7 - SURGE LIMIT CIRCUIT FOR LARGE DELAY CAPACITORS FIGURE 8 - INPUT LINE MONITOR The 100 ohm resistor limits the peak discharge current into the SG1543 while the external PNP transistor provides a high peakcurrent discharge path for the delay capacitor. 11/91 Rev 1.1 2/94 Copyright (c) 1994 4 11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570 LINFINITY Microelectronics Inc. SG1543/SG2543/SG3543 APPLICATION INFORMATION (continued) The values for the external components are determined as follows: 1000 Current limit input threshold, VTH R1 CS is determined by the current loop dynamics V V R2 Peak current to load, IP RTH + R O R2+R3 SC SC VTH Short circuit current, ISC = R SC 2.5 (R4+R5+R6) Low output voltage limit, VO (Low) = R5+R6 2.5 (R4+R5+R6) High output voltage limit, VO (High) = R6 ( ) Voltage sensing delay, tD = 10,000 CD FIGURE 9 - TYPICAL APPLICATION CIRCUIT VIN - 5 SCR trigger power limiting resistor, RG > 0.2 FIGURE 10 - SENSING MULTIPLE SUPPLY VOLTAGES FIGURE 11 - OVERCURRENT SHUTDOWN 11/91 Rev 1.1 2/94 Copyright (c) 1994 5 11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570 LINFINITY Microelectronics Inc. SG1543/SG2543/SG3543 CONNECTION DIAGRAMS & ORDERING INFORMATION Package 16-PIN CERAMIC DIP J - PACKAGE (See Notes Below) Part No. SG1543J/883B SG1543J/DESC SG1543J SG2543J SG3543J SG2543N SG3543N SG2543DW SG3543DW Ambient Temperature Range -55C to 125C -55C to 125C -55C to 125C -25C to 85C 0C to 70C -25C to 85C 0C to 70C -25C to 85C 0C to 70C Connection Diagram S.C.R. TRIGGER REMOTE ACTIVATE RESET O.V. INDICATE O.V. DELAY O.V. INPUT U.V. INPUT U.V. DELAY 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 +VIN VREF GROUND C.L. OUTPUT OFFSET/COMP C.L. N.I. INPUT C.L. INV. INPUT U.V. INDICATE 16-PIN PLASTIC DIP N - PACKAGE 16-PIN WIDE BODY PLASTIC S.O.I.C. DW - PACKAGE S.C.R. TRIGGER REMOTE ACTIVATE RESET O.V. INDICATE O.V. DELAY O.V. INPUT U.V. INPUT U.V. DELAY 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 +VIN VREF GROUND C.L. OUTPUT OFFSET/COMP C.L. N.I. INPUT C.L. INV. INPUT U.V. INDICATE 20-PIN CERAMIC LEADLESS CHIP CARRIER L- PACKAGE (Note 3) SG1543L/883B SG1543L -55C to 125C -55C to 125C 1. N.C. 2. SCR TRIGGER 3. REMOTE ACTIVATE 4. RESET 5. O.V. INDICATE 6. N.C. 7. O.V. DELAY 8. O.V. INPUT 9. U.V. INPUT 10. U.V. DELAY 3 2 1 20 19 4 5 6 7 8 18 17 16 15 14 9 10 11 12 13 11. N.C. 12. U.V. INDICATE 13. C.L. INV. INPUT 14. C.L. N.I. INPUT 15. OFFSET/COMP 16. N.C. 17. C.L. OUTPUT 18. GROUND 19. VREF 20. +VIN Note 1. Contact factory for JAN and DESC product availablity. 2. All packages are viewed from the top. 3. Consult factory for product availability. 11/91 Rev 1.1 2/94 Copyright (c) 1994 6 11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570 LINFINITY Microelectronics Inc. |
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