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

Claim 8:
9. A power supply device, comprising:
a switch control circuit; and
a load, an inductor, and a first switch, each connected in series with an input power source terminal,
wherein the switch control circuit comprises:
a sensing circuit comprising a first resistor, a second switch, and a second resistor connected to a drain terminal of the first switch, and configured to sense a drain voltage of the first switch; and
a controller, configured to determine a turn-on timing of the first switch based on a drain sensing voltage detected by the sensing circuit,
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 the load when the switch control circuit is not being operated.