Design of a current-mode, MOS, DC-DC buck converter with a quadratic slope compensation scheme

Author

Sakurai, Hiroki ; Sugimoto, Yasuhiro

Author_Institution

Chuo Univ., Tokyo, Japan

fYear

2005

fDate

7-10 Aug. 2005

Firstpage

671

Abstract

We propose the use of quadratic slope compensation in a current-mode DC-DC buck converter in place of the conventional linear slope compensation scheme. When the inductor-current detection circuit is constructed such that it has a transfer function that is inversely proportional to the input voltage, the slope value of the current feedback loop becomes insensitive to the converter´s output voltage and the damping factor of the loop becomes constant. Therefore, stable operation with large frequency bandwidth is realized. Applying the quadratic slope compensation, a CMOS DC-DC buck converter was designed that had an output voltage range from 4.5V to 0.7V, an output current range up to 1A, and a switching frequency of 5MHz using a 0.6μm CMOS process.

Keywords

CMOS integrated circuits; DC-DC power convertors; current-mode circuits; feedback; transfer functions; 0.6 micron; 0.7 to 4.5 V; 1 A; 5 MHz; CMOS DC-DC buck converter; conventional linear slope compensation; current feedback loop; current-mode DC-DC buck converter; damping factor; inductor-current detection circuit; quadratic slope compensation; transfer function; Bandwidth; Buck converters; CMOS process; Circuits; DC-DC power converters; Feedback loop; Operational amplifiers; Switching frequency; Transfer functions; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. 48th Midwest Symposium on

Print_ISBN

0-7803-9197-7

Type

conf

DOI

10.1109/MWSCAS.2005.1594190

Filename

1594190