一种多模式降压型DC-DC变换器的分析与设计  

Analysis and Design of Multi-Mode Buck DC/DC Converter

作　　者：安鸿峰[1] 吴晓波[1] 陈海[1] 娄佳娜[1] 

机构地区：[1]浙江大学超大规模集成电路设计研究所,杭州310027

出　　处：《微电子学》2008年第5期722-726,共5页Microelectronics

基　　金：国家自然科学基金资助项目(90707002)

摘　　要：为提高轻载下DC-DC变换器的效率,设计了一种降压型多模式DC-DC变换器控制芯片。其特点是在不同负载条件下采用不同的工作模式:在重、中载条件下采用脉宽调制(PWM),轻载条件下采用Burst调制,从而明显提高轻载条件下的效率。同时,采用片上集成功率开关管和同步整流管,提高了功率密度和变换器的效率。该芯片采用BCD1.5μm工艺实现。仿真结果表明,在重载和轻载条件下,变换器效率分别达到90%和80%以上。To improve the efficiency of DC-DC converter at light load condition, a multi-mode high efficiency buck regulator was proposed. The circuit operates in different working modes for different load conditions, i. e. PWM mode for heavy/medium load conditions and Burst modulation mode for light load condition, which results in obvious improvement of efficiency at light load condition. The converter was designed and simulated in 1.5 μm BCD technology. Simulation results showed that the converter had an efficiency above 90% and 80% at heavy and light load conditions, respectively.

关 键 词：降压型 DC-DC变换器 多模式 脉宽调制 Burst模式 

分 类 号：TN433[电子电信—微电子学与固体电子学]