摘要
利用片内补偿实现了一款单片电流模降压型DC-DC变换器。设计的分段线性斜坡补偿电路大大缓解了传统线性方法的过补偿问题,提高了系统响应速度。集成的RC频率补偿结构克服了稳定性对输出负载以及陶瓷输出电容ESR的依赖,简化了设计,节省了PCB面积。芯片基于标准0.5μm CMOS工艺实现,内部补偿实现了良好的环路稳定性,负载调整率以及线性调整率均小于0.4%,400 mA负载阶跃对应输出电压的响应时间小于8μs。同步整流技术使得效率高达94%。
A monolithic current-mode DC-DC buck converter with internal compensation is presented. The proposed piecewise linear slope compensation circuit deals with the overcompensation of linear method and improves transient response. Integrated RC frequency compensation structure overcomes the drawback of traditional stability dependency on load resistance and the ceramic output capacitor＇s ESR, which reduces the complexity of the design and saves the PCB space. The DC-DC converter has been fabricated with a standard 0. 5 μm CMOS process. Internal compensation technique provides high loop stability, both load and line regulations are less than 0. 4$. And the output voltage can recover within 8μs for 400mA load step. High efficiency up to 94% is achieved through internal synchronous rectification.
出处
《固体电子学研究与进展》
CAS
CSCD
北大核心
2008年第3期440-444,459,共6页
Research & Progress of SSE
基金
国家自然科学基金(60172004)
国家教育部博士点基金项目(20010701003)资助
关键词
降压型DC—DC
电流模控制
斜坡补偿
频率补偿
DC-DC buck converter
current-mode control
slope compensation
frequency compensation
