基于单稳态电路的PFM控制器设计  

Design of PFM boost DC-DC controller for low voltage

作　　者：邹雪城[1] 陈继明[1] 郑朝霞[1] 肖华[1] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2008年第1期22-25,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

摘　　要：在分析脉冲频率调制(PFM)对开关电源轻负载效率提升的基础上,设计了一款新颖的PFM升压DC-DC转换器控制芯片,内部采用独特的低压偏置产生电路和单稳态电路,结构简单(仅有21个双极型晶体管——BJT(bipolar junction transistor),它与外接高性能元件配合构成驱动LED(lightemitting diode)的高效升压电路.HSPICE仿真结果表明:在BCD-0.6μm-30 V工艺下,最低工作电压只需0.9 V,效率高达94%以上,达到了设计预期的结果,具有很好的应用前景.On the basis of the tight relation between pulse-frequency-modulation and load efficiency, a novel pulse frequency modulation boost DC-DC controller was proposed and achieved by only 21 BJTs （bipolar junction transistor）, including a monostable circuit and a special circuit generating low-voltage bias connected with external peripheral components to built a boost converter for driving several LEDs. The result of the simulation that was carried out by HSPICE using 0.6μm BCD 30 V process. Thereafter it was concluded that the lowest operation voltage is 0. 9 V and the efficiency is above 94 %.

关 键 词：脉冲频率调制(PFM) 单稳态 直流-直流变换器 发光二极管驱动 双极型 互补型 双扩散 金属氧化物半导体(BCD) 

分 类 号：TN402[电子电信—微电子学与固体电子学]