© 2010 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN4147 • Rev. 1.0.1

2

Block Diagram

AMPOUT

Line

VFB

VREF

VREF

VS

Delay

SCR

Neutral

Rectifier

and Bias

VREF

VTH

VS

SCR

Driver

VTH

Figure 1. Block Diagram

Typical Application

Line Neutral

AmpOut

SCR

MOV

Line Hot

VFB

VREF

Neutral

Line

R1

Q1

Load Hot

Load Neutral

Sense Coil 1:1000

TEST

C1

C3

C2

Neutral Coil 1:200

C4

Figure 2. Typical Application

(1)

Typical Values

R1: 91K



(2)

C1: 22nF

C3=1nF

C2: 10nF

C4=10nF

Notes:

1.

Contact Fairchild for best application practices for nuisance tripping rejection.

2.

Exact values depend on sense coil characteristics and application.