Fixed-frequency adaptive-on-time boost converter with fast transient response and light load efficiency enhancement by auto-frequency-hopping

Author

Jing, Xiaocheng ; Mok, Philip K T

Author_Institution

Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China

fYear

2011

fDate

15-17 June 2011

Firstpage

16

Lastpage

17

Abstract

An integrated fixed-frequency adaptive-on-time DC-DC converter with fast transient response and high light load efficiency is presented. To achieve fixed frequency at continuous conduction mode, the on-time is adaptively controlled to force the switching frequency tracks the reference frequency with less than +/-0.5% error within the whole operating range. To enhance the light load efficiency as well as reduce EMI noise problem, the on-time is adjusted to maintain the switching frequency hops between 1MHz and 1MHz/N where N = 2ⁱ and i = 1 to 5 according to the loads without load current sensor.

Keywords

DC-DC power convertors; adaptive-on-time boost converter; autofrequency-hopping; continuous conduction mode; fast transient response; fixed-frequency boost converter; integrated DC-DC converter; light load efficiency enhancement; switching frequency tracks; Control systems; Detectors; Frequency control; Frequency conversion; Frequency synchronization; Switching frequency; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Circuits (VLSIC), 2011 Symposium on

Conference_Location

Honolulu, HI

ISSN

2158-5601

Print_ISBN

978-1-61284-175-5

Type

conf

Filename

5986402