Reduction of equivalent series inductor effect in delay-ripple reshaped constant on-time control for buck converter with multilayer ceramic capacitors

Wei Chung Chen*, Ching Sung Wang, Yi Ping Su, Yu Huei Lee, Chia Ching Lin, Ke-Horng Chen, Ming Jhe Du

*Corresponding author for this work

Research output: Contribution to journalArticle

28 Scopus citations

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 10mV and high efficiency of 91 when ESR is smaller than 1mΩ and large interference from ESL effect is 40mV.

Original languageEnglish
Article number6289370
Pages (from-to)2366-2376
Number of pages11
JournalIEEE Transactions on Power Electronics
Volume28
Issue number5
DOIs
StatePublished - 1 Jan 2013

Keywords

  • Constant on-time control for buck converter
  • equivalent series inductor (ESL)
  • multilayer ceramic capacitors (MLCC)
  • power management

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