A method for operating a push-pull converter in an above resonant
frequency operating mode, where the above resonant frequency operating
mode produces a switching frequency that is higher than the natural
operating resonant frequency of the converter circuit. As a result, the
resonant period is longer than the turn-on period of each of the switches
in the primary circuit. The push-pull converter has two power switches
operating in alternating sequence. The push pull converter also includes
a transformer with a primary winding coupled to the power switches and a
secondary winding coupled to a secondary circuit, and an output
capacitor. The method also includes generating an operating resonant
frequency from a leakage inductance of the transformer in series with a
an input capacitance; and generating a switching frequency for the power
switches that is higher than the operating resonant frequency.