一种降压型直流开关稳压电源的设计  

Design of a buck DC switching power supply

作　　者：胡克用[1] 章真亮 倪莉莉[1] 张慧熙[1] 叶霞[1] 陈仙明 

机构地区：[1]杭州师范大学钱江学院,浙江杭州310018 [2]浙江水利水电学院机械与汽车工程学院,浙江杭州310018

出　　处：《微型机与应用》2017年第21期100-103,107,共5页Microcomputer & Its Applications

基　　金：浙江省自然科学基金(LY17E070004);浙江省教育厅科研项目(Y201533652);浙江省高等教育课堂教学改革项目(kg2015590);杭州市属高校市级精品课程建设项目(杭教高师[2015]14号)

摘　　要：为了解决传统DC-DC变换器存在的能量损耗大、效率低、输出纹波大等问题,以LM5117芯片和CSD 18532KCS MOS场效应管为核心器件,实现了16 V到5 V的直流电压降压转换。文中先通过对比各种降压型直流开关稳压电源的转换机理,确定了基于LM5117芯片的Buck变换器设计方案;接着详细阐述了电路设计中降压变换与稳压控制的方法,针对LM5117芯片外围关键的元件参数,给出了计算公式与参考数据,同时对于传统的电流采样与斜波补偿电路进行了改进;最后,经过实验验证,该设计的降压型直流开关电路负载调整率为3%,电压调整率为0.5%,效率达到87%,并且输出纹波得到较好的抑制,达到了预期设计的效果。In order to solve the problems of high energy consumption,low efficiency and large output ripple in the traditional DC-DC converter,in this paper,LM5117 chip and CSD 18532 KCS MOS field-effect tube were used as the core devices to realize 16 V to 5 V buck DC conversion. Firstly,the design scheme of the buck converter based on the LM5117 chip was determined by studying the conversion mechanism of the other switching power supply. Then,the methods of buck conversion and voltage regulation in circuit design were described in detail. According to the key parameters of the peripheral components near the LM5117 chip,the calculation formulas and reference data were given. Meanwhile,the traditional current sampling and ramp compensation circuits were improved. Finally,by the experimental verification,the designed buck DC switching power supply has the load regulation rate of 3%,voltage regulation rate of 0. 5% and conversion efficiency of 87%,and the output ripple is well restrained. The desired design effect has been achieved.

关 键 词：LM5117 开关电源 电压转换 降压 纹波 

分 类 号：TN43[电子电信—微电子学与固体电子学] TN47