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

作     者：李演明 来新泉 叶强 袁冰 贾新章 陈富吉 Li Yanming;Lai Xinquan;Ye Qiang;Yuan Bing;Jia Xinzhang;Chen Fuji

作者机构：Institute of Electronic CADXidian University Microelectronics InstituteXidian University 

出 版 物：《Journal of Semiconductors》 (半导体学报（英文版）)

年 卷 期：2009年第30卷第2期

页      面：74-80页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 081101[工学-控制理论与控制工程] 0811[工学-控制科学与工程] 0702[理学-物理学] 

主　　题：buck DC-DC current-mode adaptive on-time loop stability high efficiency 

摘      要：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.