DCM,FSM,dead time and width controllers for a high frequency high efficiency buck DC-DC converter over a wide load range  

作　　者：皮常明 严伟 张科 李文宏 

机构地区：[1]State Key Laboratory of ASIC & Systems,Fudan University

出　　处：《Journal of Semiconductors》2010年第8期114-120,共7页半导体学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(No.60676013).

摘　　要：This paper presents a width controller,a dead time controller,a discontinuous current mode（DCM） controller and a frequency skipping modulation（FSM） controller for a high frequency high efficiency buck DC-DC converter. To improve the efficiency over a wide load range,especially at high switching frequency,the dead time controller and width controller are applied to enhance the high load efficiency,while the DCM controller and FSM controller are proposed to increase the light load efficiency.The proposed DC-DC converter controllers have been designed and fabricated in the Chartered 0.35μm CMOS process,and the measured results show that the efficiency of the buck DC-DC converter is above 80%over a wide load current range from 8 to 570 mA,and the peak efficiency is 86%at 10 MHz switching frequency.This paper presents a width controller,a dead time controller,a discontinuous current mode（DCM） controller and a frequency skipping modulation（FSM） controller for a high frequency high efficiency buck DC-DC converter. To improve the efficiency over a wide load range,especially at high switching frequency,the dead time controller and width controller are applied to enhance the high load efficiency,while the DCM controller and FSM controller are proposed to increase the light load efficiency.The proposed DC-DC converter controllers have been designed and fabricated in the Chartered 0.35μm CMOS process,and the measured results show that the efficiency of the buck DC-DC converter is above 80%over a wide load current range from 8 to 570 mA,and the peak efficiency is 86%at 10 MHz switching frequency.

关 键 词：buck DC-DC converter dead time controller discontinuous current mode width controller frequency skipping modulation 

分 类 号：TM46[电气工程—电器] TM571.2