摘要
PWM电流模控制方式在DC-DC转换器设计电路中得到了广泛应用,也带来了斜率补偿问题。讨论了降压型DC-DC转换器中斜率补偿技术的原理,分析了传统的线性补偿技术并详细介绍了一种改进的分段线性补偿电路,给出了在1.6 MHz降压转换器中的实际应用电路。电路基于CSMC 0.5μm CMOS工艺设计,通过Cadence Spectre仿真验证,该斜坡补偿电路有效解决了子谐波振荡以及过补偿问题。
PWM current control mode technology is widely used in DC- DC converter,it brings the problem of slope compensation as well. This paper discusses the principle of slope compensation in DC - DC buck converter. The technique of traditional linear compensation is analyzed and an ameliorated piecewise linear slope compensation circuit is introduced in details. It presents an applicable slope compensation circuit for the buck converter at 1.6 MHz working frequency. This circuit is designed in CSMC 0.5 μm CMOS process, and its performance has been verified by Cadence Spectre simulation,it effectively resolves the problems of sub harmonic oscillations and over compensation.
出处
《现代电子技术》
2008年第3期106-108,共3页
Modern Electronics Technique
