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FOD2743B-FOD2743C
8-PIN DIP Error Amplifier Optocoupler
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2743A FOD2743B FOD2743C
DESCRIPTIONThe FOD2743 Optically Isolated Amplifier consists of the popular KA431 precision
programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide
(GaAs) light emitting diode optically coupled to a silicon phototransistor. It comes in 3
grades of reference voltage tolerance = 2%, 1%, and 0.5%.
The Current Transfer Ratio (CTR) ranges from 50% to 100%. It also has an outstanding
temperature coefficient of 50 ppm/°C. It is primarily intended for use as the error amplifier/
reference voltage/optocoupler function in isolated ac to dc power supplies and dc/dc con-
verters.
When using the FOD2743, 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 8-pin dip white package.
FEATURES Optocoupler, precision reference and error amplifier in single package 2.5V reference CTR 50% to 100% at 1mA 5,000V RMS isolation UL approval E90700, Vol. 2
CSA approval 1296837
VDE approval pending
BSI approval pending
•Low temperature coefficient 50 ppm/°C max FOD2743A: tolerance 0.5%
FOD2743B: tolerance 1%
FOD2743C: tolerance 2%
APPLICATIONS •Power supplies regulation DC to DC converters
