集成于电流模降压型DC-DC变换器的电流采样电路  

An Integrated Current-Sensing Circuit for Current-Mode DC-DC Buck Converters

作　　者：袁冰[1] 来新泉[2] 叶强[2] 李演明[1] 贾新章[1] 

机构地区：[1]西安电子科技大学微电子学院,西安710071 [2]西安电子科技大学电路CAD所,西安710071

出　　处：《Journal of Semiconductors》2008年第8期1627-1631,共5页半导体学报（英文版）

摘　　要：针对电流模降压型DC-DC变换器,提出了一种新颖的CMOS片上电流采样电路.该电路结构简单,易于集成,功率损耗小,且通过MOSFET的匹配使采样比例几乎不受温度、模型以及电源电压变化影响.并通过进一步的优化设计,使得响应速度更快,工作电压进一步降低.提出的采样电路在一款基于0.5μm CMOS工艺设计的单片电流模降压型DC-DC变换器中进行了验证.在2.5~5.5V的电压范围,0~2A的负载范围内芯片工作稳定,瞬态响应良好,且效率高达96%.A novel integrated CMOS current-sensing circuit for current-mode DC-DC buck converters is presented, The circuit is con- cise and simple to implement,and the power loss is low, Also,the achieved sense ratio is almost independent of temperature, model, and supply voltage after matching the MOSFETs. Through optimization, the response speed is faster and the minimum input voltage is lower, A current-mode DC-DC buck converter with the proposed structure has been fabricated in a 0, 5μm CMOS process for valida- tion, With a 2, 5-5, 5V input range,the chip works steadily in the load current range of 0-2A, It has a good transient response and the measured maximum efficiency is up to 96%,

关 键 词：降压型DC-DC变换器 电流模控制 电流采样电路 

分 类 号：TM46[电气工程—电器]