SWITCH CONTROL CIRCUIT, SWITCH CONTROL METHOD AND POWER SUPPLY DEVICE USING THE SAME

摘要

Embodiment relates to a switch control circuit, a switch control method, and a power supply using the switch control circuit. The power supply supplies power to a load using an input voltage. The switch control circuit controls a switching operation of the power switch that controls the power supply. The switch control circuit detects a duty of the power switch using a signal for controlling the switching operation of the power switch, detects the load using the feedback voltage, and determines a short-circuit of the sense resistor according to the detected duty and the detected load.

主权项

1. A switch control circuit comprising:
a power switch configured to control a power supply; and a PWM controller configured to control a switching operation of the power switch using a sense voltage generated in a sense resistor to which a drain current flowing to the power switch flows and a feedback voltage corresponding to the output voltage, to detect a duty of the power switch and a load connected to the power supply, and to determine a short-circuit of the sense resistor according to the detected duty and the detected load.