| 摘要 |
A control circuit of a DC-DC converter that has a switching element, including an error amplifier that amplifies a difference between a reference voltage and a feedback voltage corresponding to an output voltage of the DC-DC converter, a voltage reduction comparator that outputs an interrupt signal when the feedback voltage is lower than a voltage reduction threshold that has a value lower than that of the reference voltage, and a pulse-width modulation (PWM) signal generator circuit. The PWM signal generator circuit generates a PWM signal of a predetermined frequency based on the voltage difference when no interrupt signal is generated, or otherwise generates a switch drive signal to activate the switching element for a first period of time corresponding to the difference output by the error amplifier, and to deactivate the switching element for a second period of time after the first period of time has elapsed. |
