Patent ID: 7294994

Claim:
A power supply, comprising: a converter unit for transforming power supply input voltage to a predetermined power supply output voltage based on an error signal, and an output detection feedback section for outputting the error signal according to the power supply output voltage, the output detection feedback section comprising: an error amplifier for outputting the error signal obtained by amplifying a voltage difference between a reference voltage and an output detection voltage obtained from the power supply output voltage, a phase compensation circuit having a circuit of a capacitor and a resistor to compensate a phase of the error amplifier, a state detection circuit for outputting a state signal indicating whether the voltage difference between the output detection voltage and the reference voltage is within a predetermined range, and a response compensation circuit for inputting thereinto the state signal, and setting a voltage of the capacitor of the phase compensation circuit to a predetermined value when the voltage difference between the output detection voltage and the reference voltage is beyond the predetermined range.