用于Buck型电源芯片的电流检测电路  

Novel current sensing circuit for monolithic Buck power management

作　　者：刘颖杰[1] 冯全源[1] 

机构地区：[1]西南交通大学微电子研究所,四川成都610031

出　　处：《电子技术应用》2009年第4期76-78,共3页Application of Electronic Technique

摘　　要：电流检测是采用电流模式PWM控制方案的DC-DC变换器中最重要的技术之一。分析了目前电流检测电路的优点和不足,基于TSMC0.18μm工艺,设计了一款高精度的电流检测电路,该电路不需要运算放大器,从而简化了电路结构,降低了设计的复杂度,而且有很好的线性度,其采样率不会随着温度和输入电压的改变而改变,实现了高精度的检测。Current-sensing is one of the most important technologies in current-mode PWM controlled DC-DC converters. This paper presents several kinds of commonly used current sensing circuits, the advantages and disadvantages of the different current sensing techniques are analyzed. Then a novel current-sensing circuit implemented in a TSMC0.18μm process is proposed. This circuit has the advantage of simple topology, high precision, And, more importantly, its sampling rate is constant when the temperature and input voltage change. It realizes a high precision current＇ sensing circuit.

关 键 词：电流检测 电流模式 BUCK DC-DC变换器 电源管理 

分 类 号：TN492[电子电信—微电子学与固体电子学]