具有DCM环路校准的ACOOT控制全集成Buck
Design of fully integrated Buck converter with precise DCM operation
陈添之 1邹志革 1谢锦红 1皮庆广 1李龙迪 1童乔凌 1刘冬生1
作者信息
- 1. 华中科技大学 集成电路学院,湖北 武汉 430074
- 折叠
摘要
为解决高频下过零检测不精确所导致DCM模式下转换器存在较大反向电感电流损耗的问题,提出了一种基于自适应固定导通与关断时间控制的全集成Buck转换器.该控制方式属于脉冲频率调制(PFM),可根据输入输出电压和负载大小自动地调整导通时间和关断时间,改善轻载时输出电压纹波和效率.此外,设计了DCM校准环路,实现了精确的DCM工作.采用SMIC 65 nm CMOS工艺进行电路设计.仿真结果表明:在 2.5 V输入电压,1.2 V输出电压,负载范围为 0～150 mA条件下,最大输出电压纹波为 69 mV,峰值效率提高系数为 34.2%,峰值效率为 73%;当负载为 10 mA时,峰值效率为 51.1%.
Abstract
For solving the problem that the zero-crossing sensing is not accurate at high frequency,which causes the converter in DCM has a large reverse inductor current loss,an adaptive constant on/off time controlled fully integrated Buck converter is proposed.The control method belongs to PFM(Pulse frequency modulation),which can automatically adjust the on-time and off-time according to the input and output voltage and load,and optimizes the output voltage ripple and efficiency under light load.In addition,a DCM calibration loop is designed to achieve precise DCM operation.The circuit is designed by SMIC 65 nm CMOS process.The simulation results show that,in the case of input voltage of 2.5 V and output voltage of 1.2 V,the load range is 0-150 mA,and the maximum output voltage ripple is 69 mV,the peak efficiency enhancement factor is 34.2%,and the peak efficiency is 73%.At 10 mA light load,the peak efficiency is 51.1%.
关键词
全集成转换器/自适应固定导通与关断时间/轻载效率/非连续导通模式Key words
fully integrated converter/adaptive constant on/off time/light-load efficiency/discontinuous conduction mode引用本文复制引用
基金项目
国家自然科学基金(61874163)
国家自然科学基金(62104076)
国家自然科学基金(62134002)
国家重点研发计划(2021YFA0715502)
出版年
2024
NETL
NSTL
万方数据