Offline Flyback

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Component selectionDesign tips

Characteristics

The flyback converter is a simple isolated switching regulator topology. ”Offline” in this context means, that the converter is not operated directly on mains voltage, but behind a rectifier.

For use in protection class II applications, the transformer is designed with reinforced insulation. The isolated output feedback can be acquired either directly from a winding of the transformer or by using an optocoupler.

The flyback is the simplest solution for an isolated switching power supply (SMPS) with low power output. For power ratings above 50 W, usually more efficient topologies are used.