电流模式BUCK转换器宽占空比片内补偿方案  

Design of internal compensation for peak-current-mode BUCK converter with wide duty cycle

作　　者：邓扬扬[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：《电子元件与材料》2014年第6期58-61,65,共5页Electronic Components And Materials

基　　金：国家自然科学基金重大资助项目(No.60990320;No.60990323);国家自然科学基金面上资助项目(No.61271090);国家高技术研究发展计划("863"计划)重大资助项目(No.2012AA012305);四川省科技支撑计划资助项目(No.2012GZ0101)

摘　　要：提出了一种适用于峰值电流模式BUCK转换器的片内补偿方案,针对宽占空比范围的情况,不用改变芯片内部补偿模块,只需微调芯片外部的一个电阻,便可以得到较好的相位裕度。本设计提高了系统响应速度,克服了稳定性对输出负载和陶瓷输出电容ESR的依赖,且设计简单,可操作性强,实现了芯片的高稳定性。采用0.25μm UMC工艺仿真,结果显示在不同占空比情况下,内部补偿均实现了良好的环路稳定性。The internal compensation was proposed for peak-current-mode BUCK converter. In the situation of wide duty cycle, without changing the compensation module in the chip, simply trimming a resistor outside the chip, a better phase margin could be get. The proposed converter increases system response speed and overcomes the drawback of traditional stability which depends on load resistance and the ceramic output capacitor＇s equivalent series resistance （ESR）. This design is simple, easily operational, and makes the chip high stability. The converter was based on 0.25 μm UMC technology. The simulation results show that in the case stability. of different duty cycles, the internal compensation can achieve loop stability.

关 键 词：BUCK转换器 峰值电流模式 频率补偿 宽占空比 相位裕度 内部补偿 

分 类 号：TN43[电子电信—微电子学与固体电子学]