FOD2742A 查看數據表（PDF） - Fairchild Semiconductor

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FOD2742A

Optically Isolated Error Amplifier

Fairchild Semiconductor 

FOD2742A, FOD2742B, FOD2742C

Optically Isolated Error Amplifier

December 2008

Features

■ Optocoupler, precision reference and error amplifier in

single package

■ 2.5V reference

■ CTR 100% to 200%

■ 2,500V RMS isolation

■ UL approval E90700, Volume 2

■ BSI approval 8661, 8662

■ VDE approval 136616

■ CSA approval 1113643

■ Low temperature coefficient 50 ppm/°C max.

■ FOD2742A: tolerance 0.5%

FOD2742B: tolerance 1%

FOD2742C: tolerance 2%

Applications

■ Power supplies regulation

■ DC to DC converters

Description

The FOD2742 Optically Isolated Amplifier consists of the

popular KA431 precision programmable shunt reference

and an optocoupler. The optocoupler is a gallium

arsenide (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 100% to

200%. 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

isolated ac to dc power supplies and dc/dc converters.

When using the FOD2742, power supply designers can

reduce the component count and save space in tightly

packaged designs. The tight tolerance reference

eliminates the need for adjustments in many

applications. The device comes in a 8-pin small outline

package.

Schematic

NC 1

C2

E3

NC 4

8 LED

7 FB

6 COMP

5 GND

Package Outline

©2003 Fairchild Semiconductor Corporation

FOD2742A, FOD2742B, FOD2742C Rev. 1.0.0

www.fairchildsemi.com

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