一种峰值电流型降压DC-DC转换电路的设计  

Design of peak current type buck DC-DC converter circuit

作　　者：刘培研 赵毅强 叶茂 LIU Peiyan;ZHAO Yiqiang;YE Mao(School of Microelectronics,Tianjin University,Tianjin,300072 China)

机构地区：[1]天津大学微电子学院,天津300072

出　　处：《光电子．激光》2021年第7期753-759,共7页Journal of Optoelectronics·Laser

基　　金：天津市科技计划项目:基于封闭园区及开放道路的L4级智能网联汽车研发及示范运行(18ZXZNGX00230)资助项目。

摘　　要：设计了一款基于SMIC 0.35μmBCD工艺的降压型DC-DC转换芯片,主要应用于大功率宽输入范围的电源管理系统。采用峰值电流型PWM控制方式提供优良的负载调整特性和抗输入电源扰动能力;在电流采样的输出端添加斜坡补偿模块消除峰值电流模式引起的次谐波振荡问题;设计高增益、大带宽的电压反馈误差放大器以提供大的负载调整率并提高负载的瞬态响应能力;设计高单位增益带宽的PWM控制器以满足高开关频率工作的要求,同时提高转换效率。此外,加入了一系列保护模块以维持芯片的正常工作。系统仿真结果表明:在10-40 V的输入电压范围内,稳定输出5.5 V电压,开关频率为330 kHz,额定输出电流为1.5 A,在输入范围内的转换效率均在80%以上,典型应用下转换效率高达90%。This paper designed a buck DC-DC converter chip based on SMIC 0.35μm BCD process,which is mainly used in high-power and wide-input power management systems.In this paper,the peak current type PWM control method was used to provide excellent load regulation characteristics and resistance to input power disturbance;slope compensation was added to the output of the current sampling to eliminate the sub-harmonic oscillation caused by the peak current mode;this paper designed a high-gain,wide-bandwidth voltage feedback error amplifier to provide large load regulation and load transient response capability;the PWM controller with high unity gain bandwidth was designed to meet the requirements of high switching frequency operation and improve the conversion efficiency.In addition,this design added a series of protection modules to maintain the normal operation of the chip.The simulation results show that:this design stably outputs 5.5 V voltage within the input voltage range of 10-40 V,the switching frequency is 330 kHz,the rated output current is 1.5 A,and the conversion efficiency in the input range is above 80%.The conversion efficiency up to 90%in typical application.

关 键 词：Buck转换器 宽输入范围 峰值电流模式 斜坡补偿 高效率 

分 类 号：TN432[电子电信—微电子学与固体电子学]