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FAN1851A

By datasheet - April 3rd, 2008

www.fairchildsemi.com

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FAN1851A
Ground Fault Interrupter

Features
Improved performance over industry equivalents Tight fault current range (Typ 100 A) 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 450 A 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 Timing Capacitor Sensitivity Set Resistor Sense Amplifier Output

ITH D3 I2 Q2 SCR Trigger Q3 Latch Q1 IF I I1 TH for IF 0 3ITH for IF 0

D1 A1 Q4 IF VS

Q5

D2 10V

Ground

Inverting Input

Non-Inverting Input

REV. 2.0.1 6/17/05

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