FOD2743A Просмотр технического описания (PDF) - Fairchild Semiconductor

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FOD2743A

Optically Isolated Error Amplifier

Fairchild Semiconductor 

August 2008

FOD2743A, FOD2743B, FOD2743C

Optically Isolated Error Amplifier

Features

■ Optocoupler, precision reference and error amplifier in

a single package

■ 2.5V reference

■ CTR 50% to 100% at 1mA

■ 5,000V RMS isolation

■ UL approval E90700, Vol. 2

CSA approval 1296837

VDE approval pending

BSI approval pending

■ Low temperature coefficient 50ppm/°C max

■ FOD2743A: tolerance 0.5%

FOD2743B: tolerance 1%

FOD2743C: tolerance 2%

Applications

■ Power supplies regulation

■ DC to DC converters

Description

The FOD2743 Optically Isolated Amplifier consists of the

popular KA431 precision programmable shunt reference

and an optocoupler. The optocoupler is a gallium ars-

enide (GaAs) light emitting diode optically coupled to a

silicon phototransistor. It comes in 3 grades of reference

voltage tolerance = 2%, 1%, and 0.5%.

The Current Transfer Ratio (CTR) ranges from 50% to

100%. It also has an outstanding temperature coefficient

of 50 ppm/°C. It is primarily intended for use as the error

amplifier/reference voltage/optocoupler function in iso-

lated AC to DC power supplies and dc/dc converters.

When using the FOD2743, 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 an 8-pin dip white package.

Functional Bock Diagram

LED 1

COMP 2

GND 3

FB 4

8 NC

7C

6E

5 NC

Package Outlines

8

1

8

1

8

1

©2004 Fairchild Semiconductor Corporation

FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1

www.fairchildsemi.com

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