LM1851 데이터 시트보기 (PDF) - Unisonic Technologies

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LM1851

GROUND FAULT INTERRUPTER

Unisonic Technologies 

UTC LM1851

LINEAR INTEGRATED CIRCUIT

GROUND FAULT INTERRUPTER

DESCRIPTION

The UTC LM1851 is designed to provide ground fault

protection for AC power outlets in consumer and industrial

environments. Ground fault currents greater than a presentable

threshold value will trigger an external SCR-driven circuit

breaker to interrupt the AC line and remove the fault condition.

In addition to detection of conventional hot wire to ground faults,

the neutral fault condition is also detected.

Full advantage of the U.S. UL943 timing specification is taken

to insure maximum immunity to false triggering due to line noise.

Special features include circuitry that rapidly resets the timing

capacitor in the event that noise pulses introduce unwanted

charging currents and a memory circuit that allows firing of even

a sluggish breaker on either half-cycle of the line voltage when

external full-wave rectification is used.

FEATURES

* Internal power supply shunt regulator

* Externally programmable fault current threshold

* Externally programmable fault current integration time

* Direct interface to SCR

* Operates under line reversal; both load vs line and hot

vs neutral

* Detects neutral line faults

DIP-8

SOP-8

PIN CONFIGURATION

SCR Trigger 1

INVERTING INPUT 2

NON-INVERTING INPUT 3

GND 4

8 Vcc

7 TIMING CAPACITOR

6 SENSE ITIVITY SET RESISTOR

5 SENSE AMPLIFIER OUTPUT

UTC UNISONIC TECHNOLOGIES CO., LTD. 1

QW-R122-007,A

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