采用主从电流共享的多相DC-DC电源设计  

Design of a Multiphase DC-DC Converter with Master-Slave Current Sharing

作　　者：郭国勇[1] 石秉学[1] 

机构地区：[1]清华大学微电子学研究所,北京100084

出　　处：《微电子学》2005年第1期97-99,共3页Microelectronics

基　　金：国家自然科学基金资助项目(69636030)

摘　　要：多相PWM DC-DC电源能提供大电流和高速负载瞬态响应,可满足新一代CPU对主板 电源的要求。在多相电源中,关键的问题是如何平衡各相电流。文章提出了一种新的电流共享方法 --主从电流共享。该方法可以很好地保证各项电流的平衡。另外,为了提高效率,提出了一种新的 电流检测方法,利用降压型电源下功率管的导通电阻,准确地检测电感电流。此电源芯片采用1 μm CMOS工艺流片。测试结果表明,该电源符合英特尔公司为P4处理器电源制定的VRM9.0标准。As a candidate topology, the multiphase DC-DC converter exhibits very good performance, such as fast transient response and very high power density. In multiphase DC-DC converter, how to balance the currents in each phase is a crucial problem. To solve this problem, a novel current sharing method, master-slave current sharing, is presented in the paper. In order to increase efficiency, a novel current sensing method is also introduced, which senses the inductor current through the lower MOSFET Rdson. The DC-DC converter has been fabricated in 1-μm CMOS process. Experimental results show that the device is in accordance with specifications of Intel's VRM9. 0 design guideline for power supply of high-performance Pentium IV CPU's.

关 键 词：多相 DC—DC转换器 主从电流共享 CMOS 

分 类 号：TN452[电子电信—微电子学与固体电子学]