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FOD2741A

Fairchild Semiconductor
Part Number FOD2741A
Manufacturer Fairchild Semiconductor
Description OPTICALLY ISOLATED ERROR AMPLIFIER
Published Apr 1, 2005
Detailed Description OPTICALLY ISOLATED ERROR AMPLIFIER FOD2741A DESCRIPTION The FOD2741 Optically Isolated Amplifier consists of the popular ...
Datasheet PDF File FOD2741A PDF File

FOD2741A
FOD2741A

Overview
OPTICALLY ISOLATED ERROR AMPLIFIER FOD2741A DESCRIPTION The FOD2741 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 FOD2741, 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 dip white package.
8 1 8 1 8 1 FOD2741B FOD2741C FEATURES Optocoupler, precision reference and error amplifier in single package 2.
5V reference CTR 100% to 200% 5,000V RMS isolation UL approved E90700, Volume 2 CSA approval 1296837 VDE approval 40002463 BSI approval 8702, 8703 • Low temperature coefficient 50 ppm/°C max • FOD2741A: tolerance 0.
5% FOD2741B: tolerance 1% FOD2741C: tolerance 2% • • • • • FUNCTIONAL BLOCK DIAGRAM NC 1 8 LED C 2 7 FB E 3 6 COMP NC 4 5 GND APPLICATIONS • Power supplies regulation • DC to DC converters PIN DEFINITIONS Pin Number 1 2 3 4 5 6 7 8 Pin Name NC C E NC GND COMP FB LED Pin function description Not connected Phototransistor Collector Phototransistor Emitter Not connected Ground Error Amplifier Compensation.
This pin is the output of the error amplifier.
* Voltage Feedback.
This pin is the inverting input to the error amplifier Anode LED.
This pin is the input to the light emitting diode.
* The compensation network must be attached between pins 6 and 7.
© 2003 Fairchild Semiconductor Corporation Page 1 of 15 4/14/03 OPTICALLY ISOLATED ERROR AMPLIF...


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