| Citation: |
Li Yanming, Lai Xinquan, Ye Qiang, Yuan Bing, Jia Xinzhang, Chen Fuji. A current-mode buck DC–DC controller with adaptive on-time control[J]. Journal of Semiconductors, 2009, 30(2): 025007. doi: 10.1088/1674-4926/30/2/025007
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Li Y M, Lai X Q, Ye Q, Yuan B, Jia X Z, Chen F J. A current-mode buck DC–DC controller with adaptive on-time control[J]. J. Semicond., 2009, 30(2): 025007. doi: 10.1088/1674-4926/30/2/025007.
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A current-mode buck DC–DC controller with adaptive on-time control
DOI: 10.1088/1674-4926/30/2/025007
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Abstract
A current-mode buck DC–DC controller based on adaptive on-time (AOT) control is presented. The on-time is obtained by the techniques of input feedforward and output feedback, and the adaptive control is achieved by a sample-hold and time-ahead circuit. The AOT current-mode control scheme not only obtains excellent transient response speed, but also achieves the independence of loop stability on output capacitor ESR. In addition, the AOT current-mode control does not have subharmonic oscillation phenomenon seen in fixed frequency peak current-mode control, so there is no need of the slope compensation circuit. The auto-skip pulse frequency modulation (PFM) mode improves the conversion efficiency of light load effectively. The controller has been fabricated with UMC 0.6-µm BCD process successfully and the detailed experimental results are shown.-
Keywords:
- buck DC–DC
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References
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Proportional views
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