DocumentCode
523407
Title
A PWM/PFM switch technique of dual-mode buck converter
Author
Bi, Zhuo ; Xia, Wenbin
Author_Institution
Micro-electronic R&D Center, Shanghai University, Shanghai 200072, China
fYear
2009
fDate
7-9 Dec. 2009
Firstpage
357
Lastpage
360
Abstract
In this paper, a new model of dual-mode DC/DC buck converter for portable applications was proposed. The converter combines pulse width modulation (PWM) and pulse frequency modulation (PFM) to keep high efficiency of overall load range. The switch between PWM and PFM mode is based on the judgment of Zero-Current detector and PWM/PFM detector. The converter can operate at 600kHz with supply voltage 2.4V to 4.5V, which is suitable for single-cell lithium-ion battery supply applications[1]. The converter is modeled and simulated by Simulink. Experimental results show the maximum conversion efficiency is 93% at 140mA load current. Within all load current range from 10mA to 500mA, the converter efficiency is over 85%.
Keywords
PFM; PWM; buck converter; dual-mode converter;
fLanguage
English
Publisher
iet
Conference_Titel
Wireless Mobile and Computing (CCWMC 2009), IET International Communication Conference on
Conference_Location
Shanghai, China
Type
conf
Filename
5522002
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