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Over Current Protection for PFM Control DC-DC Converter

Kouhei YAMADA, Satoshi SUGAHARA, Nobuo FUJII

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Summary :

An over current protection method suitable for Fixed ON-time PFM (Pulse Frequency Modulation) Control DC-DC converters is proposed. It is based on inductor bottom current limiting, realized by monitoring the synchronous rectifier current and extending the OFF-phase of the main switch until it decreases to a predetermined limit, and can properly limit the output current even in case of short circuit. A Fixed ON-time PFM DC-DC converter with the proposed over current protection was designed and fabricated in CMOS IC. Its current limiting operation was verified with simulations and measurements.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E92-A No.5 pp.1301-1307
Publication Date
2009/05/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E92.A.1301
Type of Manuscript
PAPER
Category
Analog Signal Processing

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