A MOS current-mode buck DC-DC Converter with a 240-kHz loop bandwidth and unaltered frequency characteristics using a quadratic and input-voltage-dependent compensation slope

Author

Sugimoto, Yasuhiro

Author_Institution

Dept. of Electr., Electron., & Commun. Eng., Chuo Univ., Tokyo, Japan

fYear

2009

fDate

14-18 Sept. 2009

Firstpage

460

Lastpage

463

Abstract

In this study, we verified that a quadratic slope was the best-fit compensation slope for the current feedback loop of a current-mode DC-DC converter by considering the stability of the inductor current when the current disturbance was applied. We also verified that the introduction of the input voltage dependency to the quadratic slope enabled the frequency characteristics of the current feedback loop to remain completely constant without depending on the input and output voltage change of a DC-DC converter. The test chip of a MOS current-mode buck DC-DC converter using a 0.35-mum CMOS process and a 5-MHz clock realized two loop frequency bandwidths of 130 kHz and 240 kHz and was operated in two different input and output voltage settings for each frequency bandwidth. As a result, the unaltered gain and phase frequency characteristics were obtained for two different settings in each frequency bandwidth.

Keywords

CMOS integrated circuits; DC-DC power convertors; circuit feedback; compensation; current-mode circuits; power integrated circuits; CMOS process; MOS current-mode buck DC-DC Converter; bandwidth 130 kHz; bandwidth 240 kHz; current feedback loop; input-voltage-dependent compensation slope; quadratic compensation slope; size 0.35 mum; unaltered frequency characteristics; Bandwidth; CMOS process; Clocks; DC-DC power converters; Feedback loop; Frequency conversion; Inductors; Stability; Testing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

ESSCIRC, 2009. ESSCIRC '09. Proceedings of

Conference_Location

Athens

ISSN

1930-8833

Print_ISBN

978-1-4244-4354-3

Type

conf

DOI

10.1109/ESSCIRC.2009.5325976

Filename

5325976