1 MHz High-Speed Digitally Controlled DC-DC Converter

Fujio KUROKAWA  Masahiro SASAKI  Seiichi HIURA  Hirofumi MATSUO  

IEICE TRANSACTIONS on Communications   Vol.E87-B   No.12   pp.3437-3442
Publication Date: 2004/12/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on the 25th International Telecommunications Energy Conference (INTELEC'03))
dc-dc converter,  digital control,  P-I-D control,  VCO,  

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A digitally controlled dc-dc power converter is useful to dc power supply systems for telecommunications and data communications systems that require high reliability and high performance. This paper presents a design criterion and output characteristics of 1 MHz high-speed digitally controlled dc-dc converter using a voltage controlled oscillator (VCO) as an analog to digital signal converter in the digital control circuit. As a result, it is revealed theoretically and experimentally that the proposed 1 MHz high-speed digitally controlled dc-dc converter has excellent static and dynamic characteristics. The adjustability of output voltage is less than 10 mV and there is no steady-state error within the integral controlled regulation range. Also, the overshoot is suppressed enough within 0.1 V and the transient time is very short.