Product Summary
The LM1851M 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 ground faults, the neutral fault condition is also detected. Full advantage of the U.S. UL943 timing specification is taken to insure maximum immunity to false triggering due to line noise. Special features of LM1851M 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.
Parametrics
LM1851M absolute maximum ratings: (1)Supply Current: 19 mA; (2)Power Dissipation: 1250 mW; (3)Operating Temperature Range: -40℃ to +70℃; (4)Storage Temperature Range: -55℃ to +150℃; (5)Soldering Information, Dual-In-Line Package (10 sec.): 260℃; (6)Small Outline Package: Vapor Phase (60 sec.) 215℃; (7)Infrared (15 sec.) 220℃.
Features
LM1851M features: (1)Internal power supply shunt regulator; (2)Externally programmable fault current threshold; (3)Externally programmable fault current integration time; (4)Direct interface to SCR; (5)Operates under line reversal; both load vs line and hot vs neutral; (6)Detects neutral line faults.
Diagrams
Image | Part No | Mfg | Description | Pricing (USD) |
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LM1851M |
National Semiconductor (TI) |
Current & Power Monitors & Regulators |
Data Sheet |
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LM1851M/NOPB |
National Semiconductor (TI) |
Current & Power Monitors & Regulators |
Data Sheet |
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LM1851MX |
National Semiconductor (TI) |
Current & Power Monitors & Regulators |
Data Sheet |
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LM1851MX/NOPB |
National Semiconductor (TI) |
Current & Power Monitors & Regulators |
Data Sheet |
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