The FOD2742 Optically Isolated Amplifier consists of the popular KA431 precision programmable shunt reference and an optocoupler. 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 converters.
The FOD2742 series combines a precision 2.5 V reference, an optocoupler, and an error‑amplifier in a single 8‑pin SO package. It is intended for isolated AC‑to‑DC power supplies and DC‑DC converters, offering low temperature coefficient and high isolation.
Key specifications include a reference voltage of 2.5 V, current transfer ratio of 100 %–200 %, 2500 Vrms isolation, and a temperature coefficient of 50 ppm/°C. The device is available in three tolerance grades (0.5 %, 1 %, 2 %) and operates from –25 °C to +85 °C.
| Reference voltage | 2.5 V |
|---|---|
| Current Transfer Ratio (CTR) | 100 % – 200 % |
| Isolation rating | 2500 Vrms |
| Temperature coefficient | 50 ppm/°C max |
| Storage temperature range | -40 °C to +125 °C |
| Operating temperature range | -25 °C to +85 °C |
The reference voltage is 2.5 V.
It provides 2500 Vrms isolation.
FOD2742A has 0.5 % tolerance, FOD2742B 1 %, and FOD2742C 2 % tolerance.
The device can operate up to +85 °C.