This document introduces the features of FOD2743 optically isolated amplifier. This product is mainly used in ac/dc power supplies and dc/dc converters, with high precision, low temperature drift, high reliability and other characteristics.
The FOD2743A, FOD2743B and FOD2743C are optically isolated error amplifiers that combine a precision reference, an optocoupler and an error‑amplifier in a single 8‑pin DIP package. They are intended for use in isolated AC‑DC power supplies and DC‑DC converters, reducing component count and board space.
Key specifications include a 2.5 V reference, current transfer ratio of 50 %–100 % at 1 mA, isolation voltage of 5000 V RMS, temperature coefficient of 50 ppm/°C, operating temperature from –25 °C to +85 °C, and a bandwidth of 50 kHz. The devices are offered in three tolerance grades (0.5 %, 1 %, 2 %).
| Reference voltage | 2.5 V |
|---|---|
| Current Transfer Ratio (CTR) | 50%–100% at 1 mA |
| Isolation voltage | 5000 V RMS |
| Temperature coefficient | 50 ppm/°C |
| Bandwidth | 50 kHz |
| Input power dissipation | 145 mW |
The devices provide an isolation voltage of 5000 V RMS.
FOD2743A has 0.5 % tolerance, FOD2743B 1 % tolerance, and FOD2743C 2 % tolerance.
They are used for power‑supply regulation and DC‑to‑DC converters.
The maximum collector current is 50 mA.