Product Summary

The SG3543J is a power supply output supervisory circuit. 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.

Parametrics

SG3543J absolute maximum ratings : (1)Input Supply Voltage (+VIN): 40V; (2)Sense Inputs : +VIN; (3)SCR Trigger Current (Note 2) : 300mA; (4)Indicator Output Voltage : 40V; (5)Indicator Output Sink Current: 50mA; (6)Operating Junction Temperature Hermetic (J, L Packages) : 150℃; (7)Plastic (N, DW Packages): 150℃; (8)Storage Temperature Range : -65℃ to 150℃.

Features

SG3543J features: (1)Over-voltage, under-voltage, and current sensing circuits all; (2)included; (3)Reference voltage trimmed to 1% accuracy; (4)SCR "Crowbar" drive of 300mA; (5)Programmable time delays; (6)Open-collector outputs and remote activation capability; (7)Total standby current less than 10mA.

Diagrams

SG3543J block diagram