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FOD2742A-FOD2742AR1V
8-PIN SOIC Error Amplifier Optocoupler
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2742A FOD2742B FOD2742C
DESCRIPTIONThe FOD2742 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 100% to 200%. 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 FOD2742, 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 small outline package.
FEATURES Optocoupler, precision reference and error amplifier in single package 2.5V reference CTR 100% to 200% 2,500V RMS isolation UL approval E90700, Volume 2 • BSI approval 8661, 8662 VDE approval 136616 • CSA approval 1113643 Low temperature coefficient 50 ppm/°C max FOD2742A: tolerance 0.5%
FOD2742B: tolerance 1%
FOD2742C: tolerance 2%
APPLICATIONS Power supplies regulation DC to DC converters
