Features • 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 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 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 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.

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Datasheet

Title		Size	Date	Other Language
	LM1851 Ground Fault Interrupter	165 Kbytes	7-Jan-96

Featured Application Notes

Title		Size	Date	Other Language
	AN-1477: Application Note 1477 LM1771 Evaluation Board	573 Kbytes	11-Jul-06	中文
	AN-1677: Application Note 1677 LM1771 and LM3880 Based FPGA Power Supply Reference Design	177 Kbytes	14-Jan-08

More Application Notes

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	AN-292: Application Note 292 Applications of the LM3524 Pulse-Width-Modulator	239 Kbytes	3-Oct-02

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM1851M	SLM	0	44046	0	0	3532500	1	1002356520
LM1851MX	SLM	0	44046	0	0	3532500	1	1002356520
LM1851N	SLM	0	44046	0	0	3532500	1	1002356520

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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