LM1851M National Semiconductor, LM1851M Datasheet

LM1851M

Manufacturer Part Number

LM1851M

Description

IC,Ground Fault Interrupter,BIPOLAR,SOP,8PIN,PLASTIC

Manufacturer

National Semiconductor

Datasheets

1.LM1851M.pdf (8 pages)

2.LM1851M.pdf (8 pages)

Specifications of LM1851M

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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C 1995 National Semiconductor Corporation

LM1851 Ground Fault Interrupter

General Description

The LM1851 is designed to provide ground fault protection

for AC power outlets in consumer and industrial environ-

ments Ground fault currents greater than a presettable

threshold value will trigger an external SCR-driven circuit

breaker to interrupt the AC line and remove the fault condi-

tion 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 tak-

en to insure maximum immunity to false triggering due to

line noise Special features include circuitry that rapidly re-

sets the timing capacitor in the event that noise pulses intro-

duce 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

Block and Connection Diagram

TL H 5177

See NS Package Number M08A or N08E

Order Number LM1851M or LM1851N

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

TL H 5177 – 1

RRD-B30M115 Printed in U S A

June 1992

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