Dithering skip modulator with a novel load sensor for ultra-wide-load high-efficiency DC-DC converters

Hong Wei Huang*, Hsin Hsin Ho, Ke-Horng Chen, Sv Yen Kuo

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Scopus citations

Abstract

Dithering skip mode with a novel load sensor for DC-DC converters is proposed to maintain a high efficiency over a wide load range. Due to the efficiency drop of the transition from the pulse-width modulation (PWM) to pulse-frequency modulation (PFM), a novel dithering skip modulation (DSM) is introduced to smooth the efficiency curve. Importantly, DSM mode can dynamically skip the number of gate driving pulses, which is inverse proportional to load current. Besides, a novel proposed load sensor can automatically select the optimum modulation method from these three modulation methods without an external selection pin. Simulation results shows DSM can maintain the efficiency of converters as high as about 89% over a wide load current range from 3mA to 500mA.

Original languageEnglish
Title of host publicationISLPED'06 - Proceedings of the 2006 International Symposium on Low Power Electronics and Design
Pages388-393
Number of pages6
DOIs
StatePublished - 1 Dec 2006
EventISLPED'06 - 11th ACM/IEEE International Symposium on Low Power Electronics and Design - Tegernsee, Bavaria, Germany
Duration: 4 Oct 20066 Oct 2006

Publication series

NameProceedings of the International Symposium on Low Power Electronics and Design
Volume2006
ISSN (Print)1533-4678

Conference

ConferenceISLPED'06 - 11th ACM/IEEE International Symposium on Low Power Electronics and Design
CountryGermany
CityTegernsee, Bavaria
Period4/10/066/10/06

Keywords

  • Delay-line chain
  • Dithering skip modulation
  • Load sensing circuit
  • Switching converter

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