A dc-dc converter and a method for controlling a dc-dc converter

A switch-mode DC-DC power converter, comprising:

• one or more input terminals for receiving an input voltage from a voltage source;
• one or more output terminals for supplying an output voltage to a load;
• a transformer coupled between the input and output terminals, the transformer including at least one primary winding and at least one secondary winding;
• a primary switch coupled to control current through the at least one primary winding;
• a synchronous rectifier coupled to control current through the at least one secondary winding;
• and
• a control circuit coupled to receive an input signal indicative of active operation of the DC-DC converter from one of the windings of the transformer or an isolator coupled between primary and secondary sides of the transformer, and control switching operation of the synchronous rectifier by enabling switching operation of the synchronous rectifier for a defined time delay in response to the input signal transitioning to a logical low level and disabling switching operating of the synchronous rectifier after the defined time delay has elapsed.