LM1851N/NOPB National Semiconductor, LM1851N/NOPB Datasheet

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LM1851N/NOPB

Manufacturer Part Number
LM1851N/NOPB
Description
IC INTERRUPTER GRND FAULT 8-DIP
Manufacturer
National Semiconductor
Datasheet

Specifications of LM1851N/NOPB

Applications
Ground Fault Protection
Current - Supply
19mA
Voltage - Supply
22 V ~ 30 V
Operating Temperature
-40°C ~ 70°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*LM1851N
*LM1851N/NOPB
LM1851
LM1851N
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/NOPB Summary of contents

Page 1

... Block and Connection Diagram See NS Package Number M08A or N08E C 1995 National Semiconductor Corporation TL H 5177 Features Internal power supply shunt regulator Y Externally programmable fault current threshold ...

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

... Hong Kong Ltd 49) 0-180-530 85 86 13th Floor Straight Block a Ocean Centre 5 Canton Rd 49) 0-180-530 85 85 Tsimshatsui Kowloon a Tel ( 49) 0-180-532 78 32 Hong Kong a 49) 0-180-532 93 58 Tel (852) 2737-1600 a Tel ( 49) 0-180-534 16 80 Fax (852) 2736-9960 a National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 ...

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