Patent ID: 9612604
Date: 2017-04-04
CPC Classifications: G05F,G09G,H02M,H03K,H04N,Y02B

Claim:
1. A DC-DC converter for converting a DC input voltage into a desired DC output voltage to output the DC output voltage, comprising: a high-side switching device connected to the DC input voltage and operable in synchronism with a clock signal; a first driver fed with a first drive signal stepped-up to or over the DC input voltage so as to be operable to drive the high-side switching device; a bootstrap circuit having a bootstrap capacitor so as to be operable to generate the first drive signal; a low-side switching device connected in series with the high-side switching device between the DC input voltage and a ground voltage, the low-side switching device being operable to be on during a period in which the high-side switching device is off; a second driver operable to drive the low-side switching device, the second driver being fed with a second drive signal which is complementary with the first drive signal; and a drive logic circuit operable to drive the first and second drivers, wherein the drive logic circuit includes a selector operable to select one of the second drive signal and a third drive signal, the third signal being for turning on the low-side switching device during a period which corresponds, not to entirety of, but to a part of the period in which the high-side switching device is off, wherein the one of the second drive signal and the third drive signal selected by the selector is fed to the second driver.