峰值电流型PWM调制buck DC-DC的建模与仿真分析

摘要

针对目前直流转直流(DC-DC)变换器系统建模方法受限于实际电路的局限性,提出了一种新型的Cadence系统建模方法.利用Cadence工具及其理想元器件,建立脉宽调制(PWM)峰值电流型buck DC-DC的系统模型.为验证模型的性能,在旺宏0.5μm BCD工艺条件下,用电路结构替换理想模型,得到电路系统,并将其与系统模型的仿真结果进行对比.仿真结果表明,以该系统模型为指导设计的buck DC-DC芯片在340 kHz工作频率下具有宽输出电压范围,并能提供2 A的大负载电流,从而验证了该设计方法的可行性.%From the perspective of engineering practice, a new Cadence system modeling method is proposed considering the limitations of the Direct Current to Direct Current(DC-DC) system modeling methods in circuit application. A peak current-mode controlled DC-DC Pulse Width Modulation(PWM) buck converter system model is presented, which adopts ideal components in the Cadence platform to build model. A new circuit system is achieved by replacing the ideal system model with circuit construction in MXIC standard 0.5μm BCD process in order to verify the performance of the model. Compared with the circuit system, the buck DC-DC converter chip based on the system model has a wide output voltage range and a large load current of 2 A at 340 kHz operating frequency.