FAN4147SX Datasheet, PDF (1/10 Pages) Fairchild Semiconductor – Ground Fault Interrupter

FAN4147
Ground Fault Interrupter
March 2013
Features
 For GFCI and RCD Applications
 Precision Sense Amplifier and Bandgap Reference
 Built-in AC Rectifier
 Built-in Noise Filter
 Low-Voltage SCR Disable
 Direct DC Coupled to Sense Coil
 SCR Gate Driver
 Adjustable Sensitivity
 400A Quiescent Current
 Minimum External Components
 Meets UL 943 Requirements
 Ideal for 120V or 220V Systems
 Space Saving SuperSOT™ 6-Pin Package
Applications
 GFCI Output Receptacles
 GFCI Circuit Breakers
 Portable GFCI Cords
Description
The FAN4147 is a low-power Ground Fault Interrupter
(GFI) controller for detecting hazardous current paths to
ground and ground-to-neutral faults. The FAN4147
application circuit opens the load contacts before a
harmful shock occurs.
Internally, the FAN4147 contains a diode rectifier,
precision bandgap 12V shunt regulator, precision low-
V_OS offset-sense amplifier, time delay noise filter,
window-detection comparators, and an SCR driver. With
a minimum number of external components, the
FAN4147 detects and protects against a hot-wire-to-
ground fault and a neutral-line-to-neutral-load short. The
minimal components and the small SuperSOT™
package allow for a small-form-factor, low-cost solution.
The FAN4147 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
precision ground-fault detection. The low-V_OS offset-
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 a low-cost, compact
design and layout.
Ordering Information
Part Number
FAN4147SX
Operating
Temperature Range
-35°C to +85°C
Package
Packing Method
6-Lead SUPERSOT6, JEDEC M0-193, 1.6mm Tape and Reel
© 2010 Fairchild Semiconductor Corporation
FAN4147 • Rev. 1.0.1
www.fairchildsemi.com