Dynamic sawtooth compensation (DSC) technique with self-tuning mode selection (SMS) for current-mode Buck-Boost converter

Yi Ping Su*, Shih Wei Wang, Yu Huei Lee, Ke-Horng Chen

*Corresponding author for this work

Research output: Contribution to conferencePaper

1 Scopus citations

Abstract

the current-mode Buck-Boost (BB) converter with the proposed dynamic sawtooth compensation (DSC) technique is able to improve transient response and system stability. To prevent the system switches between buck and boost operations once input and output are nearly equivalent, self-tuning mode selection (SMS) is proposed to decrease output ripple and redundant power consumption by eliminating the mode misjudgment. The duty cycle is decided by the output of error amplifier and sawtooth signal, which can be adequately adjusted to ensure small output ripple and thus to improve efficiency. Besides, the DSC and SMS technique can reduce the inductor current level and the numbers of switching to decrease switching and conduction losses for high efficiency. The converter with the switching frequency of 1MHz was fabricated in 1P3M 0.25-μm CMOS process. The input voltage is in the range of 2.7V to 4.8V for battery-powered devices. The efficiency is higher than 88% when load ranges from 100mA to 400mA.

Original languageEnglish
Pages221-224
Number of pages4
DOIs
StatePublished - 28 Sep 2012
Event2012 IEEE International Symposium on Circuits and Systems, ISCAS 2012 - Seoul, Korea, Republic of
Duration: 20 May 201223 May 2012

Conference

Conference2012 IEEE International Symposium on Circuits and Systems, ISCAS 2012
CountryKorea, Republic of
CitySeoul
Period20/05/1223/05/12

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    Su, Y. P., Wang, S. W., Lee, Y. H., & Chen, K-H. (2012). Dynamic sawtooth compensation (DSC) technique with self-tuning mode selection (SMS) for current-mode Buck-Boost converter. 221-224. Paper presented at 2012 IEEE International Symposium on Circuits and Systems, ISCAS 2012, Seoul, Korea, Republic of. https://doi.org/10.1109/ISCAS.2012.6271729