LM1851M

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LM1851M 数据手册

June 1992

LM1851 Ground Fault Interrupter

General Description

Features

Internal power supply shunt regulator

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.

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

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/5177–1

Order Number LM1851M or LM1851N

See NS Package Number M08A or N08E

1995 National Semiconductor Corporation

TL/H/5177

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7 8

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型号	品牌	获取价格	描述	数据表
LM1851MX/NOPB	NSC	获取价格	IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8, Power Management
LM1851N	NSC	获取价格	Ground Fault Interrupter
LM1851N/A+	ETC	获取价格	Ground Fault Interrupter
LM1851N/B+	ETC	获取价格	Ground Fault Interrupter
LM1851N/NOPB	NSC	获取价格	IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8, 0.300 INCH, PLASTIC, DIP-8, Power Management
LM185-2.5	Linear	获取价格	Micropower Voltage Reference
LM185-2.5	NSC	获取价格	Micropower Voltage Reference Diode
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