Patent ID: 11955887
Assignee: MAGNACHIP SEMICONDUCTOR, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 6:
7. A Quasi-Resonant Mode Buck Converter switch control method of a switch control circuit, comprising;
sensing a decrease of an inductor current when a gate terminal of a first switch is in a low state using a sensing circuit comprising a first resistor, a second switch, and a second resistor connected in series between a drain terminal of the first switch and a ground terminal;
comparing a drain sensing voltage of the first switch with a predetermined reference voltage when the inductor current has a value of 0 A; and
outputting a control signal to place the gate terminal in a high state when the drain sensing voltage is less than the predetermined reference voltage,
wherein the second switch is configured to prevent current from the input power source terminal from flowing to the first resistor and the second resistor through a load when the switch control circuit is not being operated.