Patent ID: 9553514
Date: 2017-01-24
CPC Classifications: H02M

Claim:
1. A DC-DC converter comprising: an error amplifier which amplifies a difference between a divided voltage obtained by dividing a voltage outputted from an output transistor and a reference voltage to output a voltage VERR; a ramp wave generating circuit which generates a ramp wave; a PWM comparator which compares the voltage VERR and the ramp wave and thereby outputs a signal PWM; a 100% DUTY detection circuit which detects that the signal PWM is brought to 100% DUTY, and outputs a 100% DUTY detection signal; a phase compensation capacitor and a phase compensation resistor provided at an output terminal of the error amplifier; a power supply voltage rise detection circuit which detects a rise in a power supply voltage; and a discharge control circuit which discharges an electric charge of the phase compensation capacitor in response to an output signal of the power supply voltage rise detection circuit.