FOD2711_08 Datasheet, PDF (1/15 Pages) Fairchild Semiconductor – Optically Isolated Error Amplifier

August 2008
FOD2711
Optically Isolated Error Amplifier
Features
■ Optocoupler, precision reference and error amplifier in
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
■ Power supplies regulation
■ DC to DC converters
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.
Functional Bock Diagram
NC 1
C2
E3
NC ₄
8 LED
7 FB
6 COMP
5 ^GND
Package Outlines
8
1
8
1
8
1
©2003 Fairchild Semiconductor Corporation
FOD2711 Rev. 1.0.1
www.fairchildsemi.com