Analysis and implementation of a semi-integrated Buck converter with static feedback control

Author

Strandberg, Roland ; Yuan, Jiren

Author_Institution

Dept. of Appl. Electron., Lund Univ., Sweden

Volume

2

fYear

2000

fDate

2000

Firstpage

934

Abstract

The switches and the control circuit of Buck converter with static feedback control have been implemented in a standard digital 0.6 μm CMOS process. The control used is a direct large-signal approach, and the converter has been proven to be globally asymptotically stable using the theory of successors in combination with Lyapunov´s direct method. One very important design parameter is the output ripple, and prediction has shown good agreement between the describing function method and simulations. The simulated ripple of the implemented converter is of the order of ±3%, and the efficiency of the complete converter is approximately 75% at 1.5 V output on a 10Ω resistive load. The inductor and capacitor are external components, but the rest of the converter is integrated and occupies 1.9 mm². The start-up is very quick (≃10 μs) and so is the recovery from any disturbance

Keywords

CMOS analogue integrated circuits; DC-DC power convertors; Lyapunov methods; circuit feedback; circuit stability; integrated circuit design; power integrated circuits; 0.6 micron; 1.5 V; 10 mus; 10 ohm; 75 percent; CMOS; Lyapunov´s direct method; describing function method; design parameter; direct large-signal approach; globally asymptotically stable converters; output ripple; semi-integrated Buck converter; static feedback control; theory of successors; Buck converters; CMOS process; Capacitors; Feedback circuits; Feedback control; Inductors; Predictive models; Process control; Switches; Switching circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2000. Proceedings of the 43rd IEEE Midwest Symposium on

Conference_Location

Lansing, MI

Print_ISBN

0-7803-6475-9

Type

conf

DOI

10.1109/MWSCAS.2000.952907

Filename

952907