MAXREFDES1088: 91.9% Efficient Small Form Factor, 12V/250mA, Synchronous, Optocouplerless Flyback DC-DC Converter

Due to its simplicity and low cost, the flyback converter is the preferred choice for low-to-medium isolated DC-DC power-conversion applications. However, the use of an optocoupler or an auxiliary winding on the flyback transformer for voltage feedback across the isolation barrier increases the number of components and design complexity. The MAX17690 eliminates the need for an optocoupler or auxiliary transformer winding and achieves ±5% output voltage regulation over line, load, and temperature variations.

12V PWM hot-swap controller MAX5945 evaluation board diagram