The NCS37015 is a UL943 compliant signal processor for GFCI

applications with self test. The device integrates a flexible power

supply (including a 12 V shunt and two 3.3 V internal series

regulators), differential fault, and grounded−neutral detection circuits.

Self test is monitored at start up and then every 17 minutes.

Features

• Meets UL943 Self−test GFCI Requirements

• 4.0 – 12 Volt Operation (120−480 V AC mains with the appropriate

series impedance)

• −40°C to 95°C

• Typical 575 A Quiescent Current @ 11 V

• 16 Pin QFN

• Inverted and Latched SCR Output to Facilitate a Solenoid Operation

• Self Syncing Internal Oscillator adjusts to AC Mains Frequency to

Guarantee Full Resolution on 60 Hz Distribution Systems

• Optimized Solenoid Deployment (coil is not energized near the AC

mains zero crossings)

• Power Supply Monitor that Verifies Full Diode Bridge Operation

• Tiered Trip Times that Increase Immunity to Noise

• Under−voltage Detection that Allows for Increased Operation at

Lower AC Input Voltages

Typical Applications

• Portable GFCI Plugs

• GFCI Receptacles