描述 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.Microchip Ordering Part?Standard Microcircuit Drawing (SMD)?SG1543J-DESC Cross Reference 5962-8774001EASG1543J-DESC Cross Reference 5962-8774001EX

特性 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

簡介

SG1543屬于集成電路（IC）的監(jiān)控器。由制造生產的SG1543監(jiān)控器PMIC 監(jiān)控器用于監(jiān)視和/或控制電路中的電壓軌，能夠連接微控制器以維持一定的功率限值。監(jiān)控器類型包括電池備用電路、監(jiān)控器、多電壓監(jiān)控器、電源監(jiān)控器、穩(wěn)壓器/監(jiān)控器、復位計時器、定序器、簡單復位/上電復位、智能開/關控制器、系統(tǒng)管理器、電壓檢測器和看門狗電路。