DC-DC converter utilizing respectively separate low-pass filters in feedback control and output voltage smoothing and method of designing the DC-DC converter

摘要

A DC-DC converter includes a switching circuit controlled to convert an input DC voltage to a voltage having a repetitively varying waveform, a first low-pass filter circuit that includes a first capacitor and which smoothes the output voltage from the switching circuit, a control circuit applying feedback control to the switching circuit to regulate the output voltage from the first low-pass filter circuit, and a second low-pass filter circuit including a second capacitor, for smoothing the output voltage from the first low-pass filter circuit, with the second capacitor selected to have a lower value of equivalent series resistance than the first capacitor.