LM1851N National Semiconductor, LM1851N Datasheet

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LM1851N

Manufacturer Part Number
LM1851N
Description
IC,Ground Fault Interrupter,BIPOLAR,DIP,8PIN,PLASTIC
Manufacturer
National Semiconductor
Datasheet

Specifications of LM1851N

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
Y
Y
Y
Y
Y
Y
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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LM1851N Summary of contents

Page 1

... Internal power supply shunt regulator Y Externally programmable fault current threshold Y Externally programmable fault current integration time Y Direct interface to SCR Y Operates under line reversal both load vs line and hot Y vs neutral Detects neutral line faults Y Order Number LM1851M or LM1851N June 1992 TL H 5177 – 1 RRD-B30M115 Printed ...

Page 2

... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Current Power Dissipation (Note 1) Operating Temperature Range b Storage Temperature Range Electrical Characteristics Parameter Power Supply Shunt Pin 8 Average Value ...

Page 3

Internal Schematic Diagram 5177– 3 ...

Page 4

Typical Performance Characteristics Average Trip Time vs Fault Current Output Drive Current vs Output Voltage Circuit Description (Refer to Block and Connection Diagram) The LM1851 operates from 26V as set by an internal shunt regulator D3 In the absence of ...

Page 5

Application Circuits A typical ground fault interrupter circuit is shown in Figure designed to operate on 120 V line voltage with normal fault sensitivity A full-wave rectifier bridge and a 15k 2W resistor are ...

Page 6

Application Circuits (Continued) in practice the actual value of C1 will have to be modified to include the effects of the neutral loop upon the net charging current The effect of neutral loop induced currents is diffi- cult to quantize ...

Page 7

Definition of Terms Normal Fault An unintentional electrical path R the load terminal of the hot line and the ground as shown by the dashed lines Grounded Neutral Fault An unintentional electrical path between the load terminal of the neutral ...

Page 8

... National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications Molded Dual-In-Line Package (N) Order Number LM1851N NS Package Number N08E 2 A critical component is any component of a life ...

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