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FOD2711A — Optically Isolated Error Amplifier
June 2010
FOD2711A
Optically Isolated Error Amplifier
Features
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Optocoupler, precision reference and error amplifier in
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Description
The FOD2711A 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 FOD2711A, 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.
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