DC-DC converter with pseudo ripple voltage generation

摘要

The DC-DC converter includes: a switching element connected between an inductor and a power supply terminal; a pseudo ripple generation circuit configured to generate a pseudo ripple voltage depending on a ripple component that is generated in the output voltage, and a smoothed voltage by smoothing the pseudo ripple voltage; a comparison circuit configured to combine a first comparison result obtained by comparing the pseudo ripple voltage and the smoothed voltage to each other, and a second comparison result obtained by comparing a reference voltage and a feedback voltage obtained by dividing the output voltage to each other, and output a comparison result signal; and an output control circuit configured to control the switching element to be turned on and off based on the comparison result signal. The comparison circuit is configured to output only the second comparison result, as the comparison result signal, when a load becomes lighter.