SG2543 Microsemi Corporation, SG2543 Datasheet

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SG2543

Manufacturer Part Number
SG2543
Description
Power Supply Output Supervisory Circuit
Manufacturer
Microsemi Corporation
Datasheet

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11/91 Rev 1.1 2/94
Copyright
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 mini-
mum 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.
BLOCK DIAGRAM
1994
POWER SUPPLY OUTPUT SUPERVISORY CIRCUIT
1
SG1543/SG2543/SG3543
FEATURES
HIGH RELIABILITY 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
- SG1543
Available to MIL-STD-883 and
DESC SMD
LMI level "S" processing avail-
able
11861 Western Avenue
L
INFINITY Microelectronics Inc.
(714) 898-8121
Garden Grove, CA 92841
FAX: (714) 893-2570

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SG2543 Summary of contents

Page 1

... 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. BLOCK DIAGRAM 11/91 Rev 1.1 2/94 Copyright 1994 SG1543/SG2543/SG3543 FEATURES Over-voltage, under-voltage, and current sensing circuits all included Reference voltage trimmed to 1% accuracy SCR " ...

Page 2

... The numbers are meant guidelines for the thermal performance of the device/pc- board system. All of the above assume no ambient airflow. ..................................... (Note 4) T 125 C, SG2543 with A SG1543/2543 SG3543 Min. Typ. Max. Min. Typ. Max. 4.5 40 4.5 4 ...

Page 3

... OFFSET/COMP pin to Gnd 12V 15V CM IN OFFSET/COMP pin open 10mA 40V IND A = 0dB 100mV OVERDRIVE J 3 SG1543/SG2543/SG3543 SG1543/2543 SG3543 Min. Typ. Max. Min. Typ. Max. 2.45 2.50 2.55 2.40 2.50 2.40 2.60 2. 0.3 1.0 0.3 0.2 0.5 0 200 250 300 200 250 ...

Page 4

... The 100 ohm resistor limits the peak discharge current into the SG1543 while the external PNP transistor provides a high peak- current discharge path for the delay capacitor. 11/91 Rev 1.1 2/94 Copyright 1994 SG1543/SG2543/SG3543 FIGURE 4. CURRENT LIMIT INPUT THRESHOLD FIGURE 6. CURRENT LIMIT AMPLIFIER FREQUENCY RESPONSE FIGURE 8 - INPUT LINE MONITOR ...

Page 5

... APPLICATION INFORMATION FIGURE 9 - TYPICAL APPLICATION CIRCUIT 11/91 Rev 1.1 2/94 Copyright 1994 (continued) FIGURE 10 - SENSING MULTIPLE SUPPLY VOLTAGES FIGURE 11 - OVERCURRENT SHUTDOWN 5 SG1543/SG2543/SG3543 The values for the external components are determined as follows: 1000 Current limit input threshold determined by the current loop dynamics ...

Page 6

... S.C.R. TRIGGER REMOTE ACTIVATE O.V. INDICATE O.V. DELAY O.V. INPUT U.V. INPUT U.V. DELAY - 125 C 1. N.C. - 125 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 6 SG1543/SG2543/SG3543 + REF RESET 3 14 GROUND 13 C.L. OUTPUT 4 O.V. DELAY OFFSET/COMP 5 12 C.L. N.I. INPUT O.V. INPUT ...

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