Title: A synthetic ripple buck converter with dynamic hysteretic band modulation

Authors: C.T. Tsai, H.P. Chou

Addresses: Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 30013, Taiwan. ' Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 30013, Taiwan

Abstract: This paper presents an integrated DC-DC buck converter using a synthetic ripple hysteresis control scheme with a feed forward path to define the boundary of hysteresis band. The hysteresis band and the switching frequency are adjustable according to load current changes; therefore, it accelerates regulation and reduces overshoot. Full chip simulation indicated that the output voltage recovery time is shortened within 10 µs for load current transients in the range between 100 mA to 500 mA. The present circuit requires no external compensation capacitors and can be implemented with the modern integrated circuit technology for on-chip regulators.

Keywords: DC-DC buck converters; synthetic ripple hysteresis control; dynamic hysteretic band modulation; switching frequency; load current changes; simulation; on-chip regulators.

DOI: 10.1504/IJPELEC.2011.038894

International Journal of Power Electronics, 2011 Vol.3 No.2, pp.213 - 224

Received: 24 Feb 2010
Accepted: 01 Apr 2010

Published online: 05 Mar 2011 *

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