Auto-Tuned Synchronous Rectifier Controller

A method comprising:

• receiving, at high-pass filter circuit, a drain-source voltage from a drain node of a synchronous rectifier switch at a secondary-side of a power converter;
• generating, by the high-pass filter circuit, a filtered drain-source voltage using the received drain-source voltage;
• receiving, at a current comparison circuit, a current indicative of a current through the synchronous rectifier switch;
• generating, by the current comparison circuit, a current comparison signal using the received current;
• turning the synchronous rectifier switch on upon determining by an auto-tuning controller, using the current comparison signal, that a body diode conduction of the synchronous rectifier switch has occurred;
• commencing, by the auto-tuning controller, an auto-tuned delay upon determining, using the current comparison signal, that the current through the synchronous rectifier switch has changed direction;
• turning the synchronous rectifier switch off upon expiration of the auto-tuned delay;
• and
• updating, by the auto-tuning controller, during a detection window of time, a duration of the auto-tuned delay based on the filtered drain-source voltage.