宽电压大负载应用DC-DC变换器的电流采样电路  

Current-Sensing Circuit of DC-DC Converters Used Under Wide Voltage and Heavy Load

作　　者：曼茂立 田辉[3] 柯凤琴[1] 许海东[1] 

机构地区：[1]承德石油高等专科学校汽车工程系,河北承德067000 [2]河北省仪器仪表工程技术研究中心,河北承德067000 [3]承德石油高等专科学校机械工程系,河北承德067000

出　　处：《承德石油高等专科学校学报》2017年第2期33-37,共5页Journal of Chengde Petroleum College

基　　金：承德市科学技术研究与发展计划项目(车用电流模降压型DC-DC变换器芯片的研究):201601A087;承德市科学技术研究与发展计划项目资助(高精度双轴太阳自动跟踪系统研究):20157002

摘　　要：提出了一种新颖的电流模降压型DC-DC变换器的电流采样电路。该电路结合传统电流采样电路的优点,合理地使用LDMOS,实现了宽电压大负载应用DC-DC变换器的电感电流的精确采样。该结构在一款0.35μm BCD工艺的降压型DC-DC变换器中进行了投片验证。仿真和测试结果表明,输入电压为4.75 V^25 V、负载为0 A^3 A的情况下,DC-DC变换器芯片输出稳定,纹波较小且瞬态特性良好。A novel current-sensing circuit for current-mode DC-DC converters is presented. The in- ductor current of DC-DC converters used under wide voltage and heavy load is accurately sensed by the proposed circuit which combines the advantages of traditional current-sensing circuits and uses LDMOS properly. The proposed structure has been used in a buck DC-DC converter and it has been fabricated in a 0.35 μm BCD process. The performance is verified by simulation and test. With a 4.75 - 25 V supply voltage range and a 0 -3 A toad range, the DC-DC converter works steadily, and it also has a small ripple voltage and a good transient response.

关 键 词：DC—DC变换器 电流采样电路 宽输入电压 BCD工艺 

分 类 号：TN432[电子电信—微电子学与固体电子学]