LM1851 Datasheet | National Semiconductor

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 Features 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 Block and Connection Diagram Data Shee . 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 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 Storage Temperature Range 19 m A 1250 m W b 40 C to a 70 C b 55 C to a 150 C Soldering Information Dual-In-Line Package (10 sec ) Small Outline Package Vapor Phase (60 sec ) Infrared (15 sec ) 260 C 215 C 220 C See AN-450 ‘‘Surface Mounting and Their Effects on Product Reliability’’ for other methods of soldering surface mount devices DC Electrical Characteristics Parameter Power Supply Shunt...