FOD2712A Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – Optically Isolated Error Amplifier

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