DocumentCode
51275
Title
Load current-sensing circuit integrated in high-frequency PWM/PFM hybrid DC–DC buck converter
Author
Bing Yuan ; Xinquan Lai ; Yuxin Liu
Author_Institution
Minist. of Educ., Xidian Univ., Xi´an, China
Volume
50
Issue
18
fYear
2014
fDate
August 28 2014
Firstpage
1310
Lastpage
1312
Abstract
An average current-sensing circuit integrated in a hybrid DC-DC buck converter is presented. Both the high-side and the low-side switch currents are fully sensed by detecting the filtered smooth voltage of the switch node, which maintains a substantially constant mode changing point and seamless transition between pulse width modulation (PWM) and pulse frequency modulation (PFM) under various duty cycles. The achieved mode changing point is almost independent of temperature and supply voltage. The proposed circuit is suitable for high-frequency hybrid DC-DC applications.
Keywords
DC-DC power convertors; PWM power convertors; switching convertors; PFM; PWM; constant mode changing point; duty cycles; filtered smooth voltage; high-frequency hybrid DC-DC applications; high-side switch currents; hybrid DC-DC buck converter; load current-sensing circuit; low-side switch currents; switch node;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el.2013.4206
Filename
6888578
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