August 2010

© 2010 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN4146 • Rev. 1.0.0

FAN4146 — Ground Fault Interrupter

Features

For Two-Wire ALCI and RCD Applications

Precision Sense Amplifier and Bandgap Reference

Built-in AC Rectifier

Direct DC Coupled to Sense Coil

Built-in Noise Filter

Low-Voltage SCR Disable

SCR Gate Driver

Adjustable Sensitivity

Minimum External Components

Meets UL 943B Requirements

Ideal for 120V or 220V Systems

Space-Saving SuperSOT™ 6-Pin Package

Applications

Personal Care Products

Two-Wire Electrical Outlets, Circuit Breakers, and

Power Cords Requiring GFI Safety Features

ALCI and RCCB Circuits

Description

The FAN4146 is a low-power controller for AC outlet

Appliance Leakage Circuit Interrupters (ALCI) and two-

wire Residual Current Devices (RCD). The FAN4146

detects hazardous grounding conditions and open

circuits the line before a harmful shock occurs.

Internally, the FAN4146 contains a diode rectifier,

precision bandgap 12V shunt regulator, precision low

window-detection comparators, and a SCR driver. With

the addition of a minimum number of external

components, the FAN4146 detects and protects against

a hot-wire-to-ground fault. The minimum number of

components and the small SuperSOT™ package allow

for a small-form-factor, low-cost application solution.

The FAN4146 circuitry has a built-in rectifier and shunt

regulator that operates with a low quiescent current.

This allows for a high-value, low-wattage-series supply

resistor. The internal temperature compensated shunt

regulator, sense amplifier, and bias circuitry provide for

sense amplifier allows direct coupling of the sense coil

to the amplifier’s feedback signal. This eliminates the

large 50/60Hz AC-coupling capacitor. The internal delay

filter rejects high-frequency noise spikes common with

inductive loads. This decreases false nuisance tripping.

The internal SCR driver is temperature compensated

and designed to satisfy the current requirements for a

wide selection of external SCRs.

The minimum number of external components and the

6-pin SuperSOT™ package enable for a low-cost,

compact design and layout. The FAN4146ESX is an

enhanced temperature range device.

Ordering Information

Part Number

Operating

Temperature Range

Package

Packing Method

FAN4146SX

0°C to +70°C

6-Lead SUPERSOT6, JEDEC MO-193, 1.6mm

Tape and Reel

FAN4146ESX

-25°C to +80°C

6-Lead SUPERSOT6, JEDEC MO-193, 1.6mm

Tape and Reel