A novel adaptive hysteresis DC-DC buck converter for portable devices

Authors

SUNG SIK PARK
JU SANG LEE
SANG DAE YU

DOI

10.3906/elk-1809-45

Abstract

This paper presents a new technique that adjusts the hysteresis window depending on the variations in load current caused by a voltage-mode circuit to reduce the voltage and current ripples. Moreover, a compact current-sensing circuit is used to provide an accurate sensing signal for achieving fast hysteresis window adjustment. In addition, a zero-current detection circuit is also proposed to eliminate the reverse current at light loads. As a result, this technique reduces the voltage ripple below 8.08 mV$_{\rm pp}$ and the current ripple below 93.98 mA$_{\rm pp}$ for a load current of 500 mA. Circuit simulation is performed using 0.18 ${\mu}$m CMOS process parameters

Keywords

DC-DC buck converter, zero-current detection, hysteresis comparator

First Page

807

Last Page

818

Recommended Citation

PARK, SUNG SIK; LEE, JU SANG; and YU, SANG DAE (2019) "A novel adaptive hysteresis DC-DC buck converter for portable devices," Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 27: No. 2, Article 10. https://doi.org/10.3906/elk-1809-45
Available at: https://journals.tubitak.gov.tr/elektrik/vol27/iss2/10