LM1851

UTC LM1851 LINEAR INTEGRATED CIRCUIT GROUND FAULT INTERRUPTER DESCRIPTION The UTC LM1851 is designed to provide ground fault protection for AC power outlets in consumer and industrial environments. Ground fault currents greater than a presentable 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. DIP-8 SOP-8 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 www.DataSheet4U.com vs neutral * Detects neutral line faults PIN CONFIGURATION SCR Trigger INVERTING INPUT NON-INVERTING INPUT GND 1 2 3 4 8 7 6 5 Vcc TIMING CAPACITOR SENSE ITIVITY SET RESISTOR SENSE AMPLIFIER OUTPUT UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R122-007,A 6 3 2 5 8 D3 Q32 Q15 R10 5k Q35 Q36 R1 D2 1...