www.fairchildsemi.com

REV. 1.0.6 6/30/05

Features

•Powered from the AC line

• Built-in rectifier

• Direct interface to SCR

• 500 µA quiescent current

• Precision sense amplifier

• Adjustable time delay

• Minimum external components

• Meets UL 943 requirements

•For use with 110V or 220V systems

•Available in an 8-pin SOIC package

Description

The RV4141A is a low-power controller for AC receptacle

ground fault circuit interrupters. These devices detect

hazardous current paths to ground and ground to neutral

faults. The circuit interrupter then disconnects the load from

the line before a harmful or lethal shock occurs.

Internally, the RV4141A contains a diode rectifier, shunt

regulator, precision sense amplifier, current reference, time

delay circuit, and SCR driver.

Two sense transformers, SCR, solenoid, three resistors and

four capacitors complete the design of the basic circuit inter-

rupter. The simple layout and minimum component count

ensure ease of application and long term reliability.

Features not found in other GFCI controllers include a low

offset voltage sense amplifier eliminating the need for a

coupling capacitor between the sense transformer and sense

amplifier, and an internal rectifier to eliminate high voltage

rectifying diodes.

The RV4141A is powered only during the positive half

period of the line voltage, but can sense current faults inde-

pendent of its phase relative to the line voltage. The gate of

the SCR is driven only during the positive half cycle of the

line voltage.

Block Diagram

4.7K

Delay

–

+

+

–

+

–

–

+

RV4141A

65-4141-01

Cap

SCR

Line

Amp Out

Gnd

RV4141A

Low Power Ground Fault Interrupter