Circuit and method for controlling a synchronous rectifier. A circuit for monitoring the drain to source voltage of an SR transistor in a secondary side circuit of a voltage converter is disclosed, having a circuit for generating a gate control circuit for the SR MOSFET; the circuit preventing subsequent gate control signals until a primary turn on detection signal is received. In another embodiment a circuit for generating the primary turn on detection signal is provided. A method for controlling an SR transistor is disclosed comprising monitoring the drain to source voltage of the SR MOSFET, generating a gate control output, and preventing subsequent gate control output signals until a primary turn on detection signal is received. In another method embodiment a method for generating the primary turn on detection signal is disclosed. An SR embodiment incorporating the control circuit embodiments is disclosed.