A primary controller comprising a control circuit coupled to determine a mode of operation and to generate a first mode of operation signal and a second mode of operation signal. The control circuit coupled to generate a control signal in response to the first mode of operation signal or the second mode of operation signal, the control signal causes a delay time to enable a turn ON of a power switch after a turn OFF of a clamp switch. The control circuit coupled to output a clamp drive signal to control the clamp switch and comprises a delay circuit coupled to receive the first mode of operation signal and the second mode of operation signal, wherein the delay circuit is coupled to apply a first delay time or a second delay time to the control signal, the second delay time being longer than the first delay time.