COT架构降压型变换器片上纹波补偿电路  

An On-Chip Ripple Compensation Circuit for COT Architecture Buck Converter

作　　者：高峡[1] 冯全源[1] 

机构地区：[1]西南交通大学信息科学与技术学院微电子研究所,成都611756

出　　处：《微电子学》2016年第5期612-614,619,共4页Microelectronics

基　　金：国家自然科学基金资助项目(61531016);国家自然科学基金面上项目(61271090);四川省科技支撑计划资助项目(2015GZ0103)

摘　　要：基于0.18μm BCD工艺,设计了适用于电压模式恒定导通时间（COT）架构DC-DC降压型变换器的纹波补偿电路。分析了使用电解电容作为输出电容以及片外纹波补偿电路的缺点,并设计了一种新颖的片内纹波补偿电路来克服这些缺点。在芯片系统典型应用环境下,利用Cadence和Hspice软件进行电路设计和仿真。结果表明,在电源电压为5V,温度为25℃的条件下,芯片输出电压的纹波仅为2.15mV,通过纹波补偿电路的反馈电压的纹波为37mV,完全满足系统稳定要求。当温度在-20℃~125℃内变化时,输出最大纹波仅为12.6mV。An on-chip ripple compensation circuit for constant on-time（COT）Buck converter was designed in a0.18μm BCD technology.The disadvantages of using electrolytic capacitor as output capacitor and off-chip ripple compensation circuit were analyzed. A novel ripple compensation circuit was designed to overcome these shortcomings.Cadence and Hspice softwares were used for the circuit design and simulation.Under the typical operating conditions of chip system,the simulation results indicated that the ripple of output voltage VOUT was only2.15 mV at 5Vpower supply and 25 ℃ temperature.The ripple of feedback voltage VFBreached 37 mV,which fully met the system requirement.The maximum output ripple was only 12.6 mV when the temperature changed from-20 ℃to 125 ℃.

关 键 词：降压型变换器 恒定导通时间 纹波补偿 

分 类 号：TN433[电子电信—微电子学与固体电子学]