Description

The FOD2743 Optically Isolated Amplifier consists of the popular KA431 precision programmable shunt reference and an optocoupler. The optocoupler is a gallium ars enide (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 iso lated AC to DC power supplies and dc/dc converters.

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 an 8-pin dip white package.

Features

■ Optocoupler, precision reference and error amplifier in a 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 50ppm/°C max

■ FOD2743A: tolerance 0.5

FOD2743B: tolerance 1

FOD2743C: tolerance 2

Applications

■ Power supplies regulation

■ DC to DC converters