Title: Reduction of Equivalent Series Inductor Effect in Delay-Ripple Reshaped Constant On-Time Control for Buck Converter With Multilayer Ceramic Capacitors
Authors: Chen, Wei-Chung
Wang, Ching-Sung
Su, Yi-Ping
Lee, Yu-Huei
Lin, Chia-Ching
Chen, Ke-Horng
Du, Ming-Jhe
Department of Electrical and Computer Engineering
Keywords: Constant on-time control for buck converter;equivalent series inductor (ESL);multilayer ceramic capacitors (MLCC);power management
Issue Date: 1-May-2013
Abstract: The stability of conventional constant on-time control buck converter is constrained by the time constant, which is the product of the output capacitor and its equivalent series resistance (ESR). Specialty polymer capacitor which is mostly used as output capacitor for such a consideration although it limits the performance of converter. On the other hand, the multilayer ceramic capacitors are widely used in commercial power management ICs due to the advantages of low cost and ESR. However, the stability often confronts with the subharmonic problem caused by small time constant. A differential-zero compensator with the noise margin enhancement (DZC-NME) technique in constant on-time control buck dc-dc converter with output ceramic capacitor is proposed in this paper. Thus, the proposed DZC-NME technique not only eliminates the limit of large time constant but also tolerates the existence of equivalent series inductor (ESL) effect. Experiment results demonstrate small output ripple of 10 mV and high efficiency of 91% when ESR is smaller than 1 m Omega and large interference from ESL effect is 40 mV.
URI: http://dx.doi.org/10.1109/TPEL.2012.2215886
ISSN: 0885-8993
DOI: 10.1109/TPEL.2012.2215886
Volume: 28
Issue: 5
Begin Page: 2366
End Page: 2376
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