一种集成软启动功能的频率抖动技术  

Frequency Jitter Technology With Integrated Soft-start Function

作　　者：肖斌[1] 黄晨[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《物联网技术》2011年第5期50-52,共3页Internet of things technologies

摘　　要：介绍了一种应用于开关电源芯片中集成软启动功能的频率抖动技术。此技术能避免较复杂的数字分频控制电路,以简化电路设计。同时还有软启动功能,并具有较好的复用性。芯片上电后,可在17ms软启动后实现±5kHz的频率抖动。文中分析了频率抖动信号产生电路的工作原理,并用TSMC0.5μmCMOS工艺库对信号产生电路进行了HSPICE仿真验证。仿真结果证明,其电路的输出与手工计算的结果基本一致。This paper first introduces frequency jitter technology with integrated soft-start function applied in switch chips.The technology can avoid complex digital frequency-division control circuit to simplify the circuit design with soft- start function and better reusability and can realize a±5kHz frequency jitter in a 17ms soft start at power-on-chip. Then it analyzes the operating principle of the circuit due to frequency jitter.Finally the circuit is HSPICE simulated by using the TSMC 0.50μm CMOS process library.It is shown by the simulated waveform that the output of the circuit is consistent with manual calculations.

关 键 词：频率抖动 软启动 电磁干扰 浪涌电流 

分 类 号：TN937[电子电信—信号与信息处理]