器件名称:
FAN1851A
功能描述:
Ground Fault Interrupter
文件大小:
122.61KB 共11页
简 介:
www.fairchildsemi.com FAN1851A Ground Fault Interrupter Features Improved performance over industry equivalents – Tight fault current range (Typ ±100A) – Temperature compensated fault current characteristics – No external trimming required Direct interface to SCR Supply voltage derived from AC line—26V shunt Adjustable sensitivity Grounded neutral fault detection Meets UL943 standards 450A quiescent current Ideal for 120V or 220V systems Package options: 8L DIP and 8L SOIC Description The FAN1851A is a controller for AC outlet ground fault interrupters. These devices detect hazardous grounding conditions (example: a pool of water or an electrical equipment connected to opposite phases of the AC line) in consumer and industrial environments. The output of the IC triggers an external SCR, which in turn opens a relay circuit breaker to prevent a harmful or lethal shock. Full advantage of the U.S. UL943 timing specification is taken to ensure maximum immunity to false triggering due to line noise. A special feature in the circuitry rapidly resets the integrating timing capacitor in the event that noise pulses introduce unwanted charging currents. Also, a flip-flop is included that ensures firing of even a slow circuit breaker relay on either of the two half-cycles of the line voltage when external full wave rectification is used. The application circuit can be configured to detect both normal faults (hot wire to ground) and grounded neutral faults. Block Diagram +VS ……
