US Patent 11764677 Control circuit, switching converter and integrated circuit

A control circuit for a switching converter having a main power switch, the control circuit including: a voltage generation circuit configured to be connected with a common connection terminal of the main power switch and an inductor to receive a drain-source voltage of the main power switch, and to generate a first voltage according to the drain-source voltage; a valley detection circuit configured to generate a valley detection signal according to the first voltage when the drain-source voltage resonates to a valley; and where the control circuit is configured to turn on the main power switch according to the valley detection signal.