FOD2712

OPTICALLY ISOLATED ERROR AMPLIFIER FOD2712

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OPTICALLY ISOLATED ERROR AMPLIFIER FOD2712
DESCRIPTION
The FOD2712 Optically Isolated Amplifier consists of the popular RC431A precision programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide (GaAs) light emitting diode optically coupled to a silicon phototransistor. The reference voltage tolerance is 1%. The current transfer ratio (CTR) ranges from 100% to 200%.
SEATING PLANE

PACKAGE DIMENSIONS

0.164 (4.16) 0.144 (3.66)

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 FOD2712, 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 compact 8-pin small outline package.

1 0.202 (5.13) 0.182 (4.63)

0.143 (3.63) 0.123 (3.13)

0.010 (0.25) 0.006 (0.16)

FEATURES
Optocoupler, precision reference and error amplifier in single package 1.240V 1% reference CTR 100% to 200% 2,500V RMS isolation VDE approval 136616 BSI approval 8661 and 8662 UL approval E90700 CSA approval 1113643
FUNCTIONAL BLOCK DIAGRAM
0.021 (0.53) 0.011 (0.28)

0.008 (0.20) 0.003 (0.08) 0.050 (1.27) TYP

0.244 (6.19) 0.224 (5.69)

Lead Coplanarity : 0.004 (0.10) MAX

8 LED

7 FB

6 COMP

APPLICATIONS
Power system for workstations Telecom central office supply Telecom bricks

5 GND

NOTE All dimensions are in inches (millimeters)

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

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4/10/03