Patent ID: 8310797

Claim:
A short-circuit protection circuit for a power supply device, comprising: a driving transistor, for controlling to output an input voltage to a load according to a first control voltage; a shutdown transistor, coupled to the driving transistor, for controlling a level of the first control voltage according to a second control voltage; and an energy storage module, coupled to the shutdown transistor, for storing energy of the input voltage, to output a specific voltage as the second control voltage in a specific interval after short-circuit occurs, comprising: a current source, for receiving the input voltage, and outputting a charging current; a diode, coupled to the current source, for controlling conduction of the charging current according to a capacitor voltage and the input voltage; a capacitor, coupled to the diode, for generating the capacitor voltage after being charged by the charging current; and a level shifter, coupled to the capacitor, for outputting the second control voltage according to the capacitor voltage after short-circuit occurs.