Bia s, Reference &

Thresholds

+

-

Ove r-Lim it Time rs

OUT

FB

REF

Self-Test Digit al

SCR Cont rol

VDD

PH

FT

SCR_TST

ALA RM

GND

SCR

VREF

Threshold

Detect ion

VTH:1-4

VS

AFE3010

GFCI SELF-TEST

PTT

NG_OUT

SW_OPE N

SEL

7

AFE3010

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SBFS042 – JUNE 2020

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7 Detailed Description

7.1 Overview

The AFE3010 is a Ground Fault Circuit Interrupter (GFCI) controller to detect the presence of leakage paths that

could lead to potential injuries from electric shock. This device is designed to develop UL-943 compliant system

like a GFCI receptacle or circuit-breaker. The self-test functionality ensures that the circuit is operating correctly

prior to an actual fault event. A GFCI device relies on the imbalance of differential current through the

transformer to detect a ground fault. The presence of a neutral-ground leakage path can potentially mask some

of this imbalance through the transformer during an actual ground fault event, resulting in safety hazard for the

downstream equipments connected to the GFCI unit. The AFE3010 employs an unique closed-loop neutral-

ground leakage detection scheme to alleviate this safety hazard. The precision, low-noise amplifier along with the

threshold detection filters in the AFE3010 ensure accurate detection of fault events while minimizing unintended

false alerts.

7.2 Functional Block Diagram