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1. A circuit comprising: a flyback DC-DC converter comprising: a transformer having a primary winding and a secondary winding, the primary winding extending from a first terminal to a second terminal; a first switch having a first gate terminal, a first source terminal and a first drain terminal, the first drain terminal coupled to the first terminal of the primary winding; a second switch having a second gate terminal, a second source terminal and a second drain terminal, the second source terminal coupled to the first terminal of the primary winding; and a capacitor coupled between the second drain terminal and the second terminal of the primary winding; wherein the second switch is arranged to transition between on and off states such that a sum of a first time period and a second time period equals a sum of a third time period and a fourth time period, wherein: the first time period is a delay time period from a time that the first switch is turned off to a time that the second switch is turned on; the second time period is a time period that the second switch is on; the third time period is a resonance time period of a resonator, the resonator formed by a leakage inductance of the transformer and a capacitance of the capacitor; and the fourth time period is a time period to discharge the leakage inductance of the transformer into the capacitor.
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