一种BUCK型开关稳压器负载电流检测电路  

A Load Current Sensing Circuit for BUCK Switching Regulator

作　　者：王辉[1] 王松林[1] 来新泉[2] 牟在鑫[1] 郭宝龙[1] 

机构地区：[1]西安电子科技大学机电工程学院,西安710071 [2]西安电子科技大学CAD所,西安710071

出　　处：《固体电子学研究与进展》2009年第1期117-121,共5页Research & Progress of SSE

基　　金：国家自然科学基金资助项目(基金号:60572152)

摘　　要：针对Buck型开关稳压器的断续工作模式(DCM),基于CSMC0.5μm CMOS工艺设计实现了一种新颖的负载电流检测电路。同传统的电感电流采样方式不同,该结构直接应用与负载电流变化几乎同步的同步管栅极驱动信号作为"电流采样"信号,实现了负载平均电流的检测。经投片验证,提出的电流检测电路工作良好,且面积仅占芯片的1.5%,同传统采样方式相比,面积减小了21%,静态时的耗电仅为原来的40%。By adopting CSMC 0. 5μm CMOS process, a novel load current sensing circuit is presented for DCM of BUCK switching regulator. Different from the traditional inductor current sensing circuit, the sensing of load current is realized by detecting the gate driver signal of synchronous MOSFET which changes with the load current simultaneously. The measurement result shows that the proposed current sensing circuit works normally in the fabricated chip for verification. The circuit occupies only 1.5% area of the chip. Comparing with traditional method, the area is reduced by 21% and power dissipation is only 40% of that.

关 键 词：开关稳压器 断续模式 电流检测 采样电路 

分 类 号：TN433[电子电信—微电子学与固体电子学]