| Citation: |
Li Yanming, Lai Xinquan, Yuan Bing, Jia Xinzhang, Zhang Wei, Ye Qiang. Design and Implementation of a Buck DC-DC Controller with Adaptive On-Time Control[J]. Journal of Semiconductors, 2008, In Press.
Li Y M, Lai X Q, Yuan B, Jia X Z, Zhang W, Ye Q. Design and Implementation of a Buck DC-DC Controller with Adaptive On-Time Control[J]. J. Semicond., 2008, 29(7): 1396.
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Design and Implementation of a Buck DC-DC Controller with Adaptive On-Time Control
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Abstract
A buck DC-DC controller based on adaptive on-time (AOT) control is presented in this paper.The adaptive on-time is achieved by input voltage feedforward and output voltage feedback,and the linearity of the on-time is corrected by the novel charging current compensation and charging time ahead circuits.The designed controller can operate at fixed frequency without an internal oscillator,which has better output voltage ripple.Simultaneously,the AOT controller will operate at the minimum off-time cycle or continuous shutoff when load steps,which greatly enhances the transient response speed of the system.In addition,the auto-skip PFM (pulse frequency modulation) mode boosts conversion efficiency during light load operation.The controller has been successfully fabricated with a UMC 0.6μm BCD process,and the detailed experimental results are shown at the end of the article.-
Keywords:
- buck DC-DC,
- adaptive on-time,
- fast transient response,
- high efficiency
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References
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