We’re used to those high voltage projects which use a self-oscillating transformer circuit with a TV flyback winding ... the same idea is used to create a low voltage instead of a high one?

A power tip that discusses how to address highly integrated USB PD charger design constraints with a self-biasing circuit.

Most of these power supplies use a transformer to step down the voltage to a more usable level and also to provide some galvanic isolation to the low voltage circuit. But for circuits where weight ...