RV4145A 데이터 시트보기 (PDF) - Fairchild Semiconductor

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RV4145A

Low Power Ground Fault Interrupter

Fairchild Semiconductor 

RV4145A

Low Power Ground Fault Interrupter

www.fairchildsemi.com

Features

• No potentiomenter required

• Direct interface to SCR

• Supply voltage derived from AC line – 26V shunt

• Adjustable sensitivity

• Grounded neutral fault detection

• Meets U.L. 943 standards

• 450µA quiescent current

• Ideal for 120V or 220V systems

Description

The RV4145A is a low power controller for AC outlet

ground fault interrupters. These devices detect hazardous

grounding conditions, such as equipment (connected to

opposite phases of the AC line) in contact with a pool of

water and open circuits the line before a harmful or lethal

shock occurs.

Contained internally are a 26V zener shunt regulator, an op

amp, and an SCR driver. WIth the addition of two sense

transformers, a bridge rectifier, an SCR, a relay, and a few

additional components, the RV4145A will detect and protect

against both hot wire to ground and neutral wire to ground

faults. The simple layout and conventional design ensure

ease of application and long-term reliability.

Block Diagram

VFB

+Input

VREF

(+13V)

RV4145A

R1

10K

R2

10K

6.5V 6.5V 6.5V 6.5V

Op Amp Output

+VS

(+26V)

Ground

R3

4.7K

SCR Trigger

65-4145A-01

REV. 1.0.5 12/7/04

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