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FOD2712A

Optically Isolated Error Amplifier

Fairchild Semiconductor 

December 2010

FOD2712A

Optically Isolated Error Amplifier

Features

■ Optocoupler, precision reference and error amplifier in

single package

■ 1.240V ± 1% reference

■ CTR 100% to 200%

■ 2,500V RMS isolation

■ UL approval E90700

Applications

■ Power system for workstations

■ Telecom central office supply

■ Telecom bricks

Description

The FOD2712A Optically Isolated Amplifier consists of

the popular AZ431L precision programmable shunt ref-

erence and an optocoupler. The optocoupler is a gallium

arsenide (GaAs) light emitting diode optically coupled to

a silicon phototransistor. The reference voltage toler-

ance is 1%. The current transfer ratio (CTR) ranges from

100% to 200%.

It is primarily intended for use as the error amplifier/

reference voltage/optocoupler function in isolated AC to

DC power supplies and dc/dc converters.

When using the FOD2712A, power supply designers can

reduce the component count and save space in tightly

packaged designs. The tight tolerance reference elimi-

nates the need for adjustments in many applications.

The device comes in a compact 8-pin small outline

package.

Schematic

NC 1

C2

E3

NC 4

8 LED

7 FB

6 COMP

5 GND

Package Outline

©2010 Fairchild Semiconductor Corporation

FOD2712A Rev. 1.0.1

www.fairchildsemi.com

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