Patent ID: 8643352

Claim:
A switching power supply control apparatus that controls a switching power supply having first and second switching elements connected in series between a DC power supply and a ground in which a voltage produced by stepping down the voltage of the DC power supply is formed at an output terminal by a current that flows through a node between the two switching elements, the switching power supply control apparatus comprising: a comparator configured to compare a voltage proportional to an output voltage with a reference voltage; a clock generator configured to generate a clock signal; and a control circuit connected to the comparator and the clock generator and configured to generate a first delayed clock signal obtained by delaying the clock signal by a first time delay that is less than a half period of the clock signal and a second delayed clock signal obtained by delaying the clock signal by a second time delay that is greater than the first time delay and less than the half period of the clock signal, and to generate a control signal based on a comparison result of the comparator and the first and second delayed clock signals, the control signal causing the first switching element on a side of the DC power supply to perform an ON/OFF operation at least once in each period of the clock signal.