A current-mode buck DC–DC controller with adaptive on-time control

作者：Li Yanming Lai Xinquan Ye Qiang Yuan Bing Jia Xinzhang and Chen Fuji

来源：Pan Tao Ti Hsueh Pao/chinese Journal of Semiconductors, 2009, 30(02): 74-80.

DOI：10.1088/1674-4926/30/2/025007

• buck DC– DC
• current-mode
• adaptive on-time
• loop stability
• high efficiency

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.

• 出版日期2009-2-15
• 单位西安电子科技大学