A constant off-time controlled boost converter with adaptive current sensing technique

Author

Lin Cheng ; Jinhua Ni ; Zhiliang Hong ; Liu, Bill Yang

Author_Institution

State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China

fYear

2011

fDate

12-16 Sept. 2011

Firstpage

443

Lastpage

446

Abstract

Using adaptive current sensing (ACS) technique, a constant off-time controlled boost converter with an improved off-time generator (OTG) is presented. With the ACS technique, this boost converter achieves wide conversion range operation without external compensation circuits. An improved OTG is proposed to compensate the switching frequency variation. The converter has been implemented in 0.5um 40V BCD process. Measurement results show that a conversion range of 5V input to 5.5~36V output and switching frequency variation of 1% can be obtained. The overshoot or undershoot in different conversion ratios is only about 0.5% of the output voltage with a load current step of 200mA.

Keywords

power control; power convertors; power electronics; switching circuits; adaptive current sensing technique; constant off-time controlled boost converter; current 200 mA; off-time generator; size 0.5 mum; switching frequency variation; voltage 40 V; voltage 5 V; wide conversion range operation; Current measurement; Gain; Poles and zeros; Sensors; Switching frequency; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

ESSCIRC (ESSCIRC), 2011 Proceedings of the

Conference_Location

Helsinki

ISSN

1930-8833

Print_ISBN

978-1-4577-0703-2

Electronic_ISBN

1930-8833

Type

conf

DOI

10.1109/ESSCIRC.2011.6045002

Filename

6045002