Analysis of Coupled Inductors for Low-Ripple Fast-Response Buck Converter

Santhos A. WIBOWO  Zhang TING  Masashi KONO  Tetsuya TAURA  Yasunori KOBORI  Ken-ichi ONDA  Haruo KOBAYASHI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E92-A   No.2   pp.451-455
Publication Date: 2009/02/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E92.A.451
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Analog Circuit Techniques and Related Topics)
coupled inductor,  multiphase,  buck converter,  DC-DC converter,  

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This letter presents an analysis of characteristics of multiphase buck converters with coupled inductors. We derive equivalent inductances that provide both low per-phase steady-state ripple current and fast transient response. The characteristics of coupled-inductor circuits--low per-phase ripple current and fast response--were examined and verified by circuit simulation and experiments.