低压大电流高效率同步整流BUCK变换器的分析与设计  

Analysis and Design of Low-Voltage large-current and High Efficiency Synchronous Rectifier BUCK Converter

作　　者：王斌[1] 邰永红[1] 杨郑浩[1] 

机构地区：[1]中国航空无线电电子研究所,上海200241

出　　处：《航空电子技术》2013年第2期42-47,共6页Avionics Technology

摘　　要：随着电子技术的迅速发展及各种微处理器、IC芯片和DSP的普及应用,对低压大电流输出的DC-DC变换器的效率要求越来越高;同步整流是采用低导通电阻的MOSFET来取代整流二极管,可以有效降低整流损耗,提高功率变换器的效率;在分析非隔离同步整流BUCK变换器效率的基础上,介绍一种外部驱动芯片MAX797在非隔离同步整流BUCK变换器中的应用,该芯片在很宽的输入输出电压范围内可以保持较高的效率。With the rapid development of electronic technology and prevalent application of microprocessor, IC and DSP, high DC-DC converter efficiency is required for low-voltage and large-current circuit. The synchronous rectification is to replace rectifying diode with power MOSFET which has low turn-on resistance, so it can decrease the dissipation of rectifier greatly and improve converter efficiency. The paper analyzes efficiency of synchronous rectification non-insulate BUCK converter and recommends external driver chip MAX797 in application of non-insulate BUCK converter. The chip can keep high efficiency in large range of input and output voltage.

关 键 词：同步整流 BUCK变换器 PWM控制 MAX797 

分 类 号：TM461[电气工程—电器]