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Details, datasheet, quote on part number:LM1851M
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| Part: | LM1851M |
| Category: | Multimedia => Ground Fault Interrupters |
| Description: | LM1851 - Ground Fault Interrupter, Package: Soic Narrow, Pin Nb=8 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM1851M datasheet File size : 169 kB |
| Request For quote: | Find where to buy LM1851M
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Datasheet text preview:
LM1851 Ground Fault Interrupter
June 1992
LM1851 Ground Fault Interrupter
General Description
The LM1851 is designed to provide ground fault protection for AC power outlets in consumer and industrial environments 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 condition In addition to detection of conventional hot wire to F ground faults the neutral fault condition is also detected ull 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
Y Y Y Y Y
eatures
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
Y
F
Block and Connection Diagram
TL H 5177 1
Order Number LM1851M or LM1851N See NS Package Number M08A or N08E
C1995 National Semiconductor Corporation
TL H 5177
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings
p If Military Aerospace specified devices are required lease contact the National Semiconductor Sales S Office Distributors for availability and specifications upply Current Power Dissipation (Note 1) Operating Temperature Range Storage Temperature Range D
b 40
19 mA 1250 mW
Soldering Information Dual-In-Line Package (10 sec ) Small Outline Package Vapor Phase (60 sec ) Infrared (15 sec )
260 C 215 C 220 C
C to a 70 C b 55 C to a 150 C
See AN-450 ``Surface Mounting and Their Effects on Product Reliability'' for other methods of soldering surface mount devices
C Electrical Characteristics
Parameter Power Supply Shunt Regulator Voltage Latch Trigger Voltage Sensitivity Set Voltage Output Drive Current Output Saturation Voltage Output Saturation Resistance Output External Current Sinking Capability Noise Integration Sink Current Ratio
TA e 25 C ISS e 5 mA Conditions Min 22 15 6 05 Typ 26 17 5 7 1 100 100 2 0 5 Max 30 20 82 24 240 Units V V V mA mV X mA
Pin 8 Average Value Pin 7 Pin 8 to Pin 6 Pin 1 With Fault Pin 1 Without Fault Pin 1 Without Fault Pin 1 Without Fault Vpin 1 Held to 0 3V (Note 4) Pin 7 Ratio of Discharge Currents Between No Fault and Fault Conditions
20
28
36
mA mA
AC Electrical Characteristics TA e 25 C
Parameter Normal Fault Current Sensitivity Normal Fault Trip Time Normal Fault with Grounded Neutral Fault Trip Time Conditions
ISS e 5 mA Min 3 Typ 5 18 18 Max 7 Units mA ms ms
Figure 1 (Note 3)
500X Fault Figure 2 (Note 2) 500X Normal Fault 2X Neutral Figure 2 (Note 2)
Note 1 For operation in ambient temperatures above 25 C the device must be derated based on a 125 C maximum junction temperature and a thermal resistance Nf 80 C W junction to ambient for the DIP and 162 C W for the SO Package o Note 2 Average of 10 trials Note 3 Required UL sensitivity tolerance is such that external trimming of LM1851 sensitivity will be necessary ote 4 This externally applied current is in addition to the internal ``output drive current'' source T
L H 5177 2
FIGURE 1 Normal Fault Sensitivity Test Circuit
2
Internal Schematic Diagram
TL H 5177 3
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