FOD2711 — Optically Isolated Error Amplifier
August 2008
FOD2711
Optically Isolated Error Amplifier
Features
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Optocoupler, precision reference and error amplifier in
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Description
The FOD2711 Optically Isolated Amplifier consists of the
popular RC431A precision programmable shunt refer-
ence 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 FOD2711, 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 8-pin dip white package.
single package
1.240V ± 1% reference
CTR 100% to 200%
5,000V RMS isolation
UL approval E90700, Volume 2
CSA approval 1296837
VDE approval 40002463
BSI approval 8702, 8703
Applications
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Power supplies regulation
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DC to DC converters
Functional Bock Diagram
Package Outlines
NC
1
8 LED
8
1
C
2
7 FB
E
3
6 COMP
8
8
1
1
NC
4
5 GND
©2003 Fairchild Semiconductor Corporation
FOD2711 Rev. 1.0.1
www.fairchildsemi.com
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
