摘要
设计了一种用于升压型DC-DC转换器的限流电路,可以防止芯片内部的功率开关管遭受大电流的冲击。该电路把电流流过开关管产生的压降与参考电流流过参考管产生的压降相比较,输出电流限制信号,克服了传统限流电路功耗大等缺陷。还设计了一种低功耗的动态参考电流源,其软启动功能能够减小输出电压的过冲。Spectre仿真结果表明,限流电路有效限制了开关管的最大电流,满足设计要求。
A current-limiting circuit which can prevent the power switch on the chip from being under attack of high-current was designed for boost DC-DC converter. The circuit supplies the current-limiting signal by comparing the voltage drop of switch MOS with the voltage drop of reference MOS. A lossless current reference having changeable current value was also designed. The soft-start circuit can reduce the overshoot of the output voltage. The Spectre simulating result shows that the current-limiting circuit limits the maximum current effectively. This current-limiting circuit can meet the design requirements.
出处
《半导体技术》
CAS
CSCD
北大核心
2009年第9期915-918,共4页
Semiconductor Technology
基金
沈阳市技术创新开发研究计划(1053125-1-13)
