基于LM5117的降压型直流开关稳压电源设计  

Design of Buck DC Switching Power Supply Based on LM5117

作　　者：胡红东[1] 朱保鹏 魏海峰[1] 

机构地区：[1]江苏科技大学电子信息学院

出　　处：《变频器世界》2016年第10期92-95,共4页The World of Inverters

摘　　要：降压型直流开关稳压电源具有功耗小、效率高、输出稳定电压范围宽等优点,使其在当今电子设备中充当着重要角色。本文通过研究降压型直流开关稳压电源的转换机理,对降压型直流开关稳压电源进行建模并进行了电路设计,以及对电路模型进行理论计算和进行电路验证,根据对电路的转换功率、输出电压以及纹波的分析,得到了降压型直流开关稳压电源的电压调整率、负载调整率以及稳压波动的影响。整个电路设计采用LM5117主控芯片,通过CSD18532KCS MOS场效应管调节电路,实现电压的稳定输出。整个电路包括LM5117降压芯片、驱动电路、H桥电路、滤波电路、自举电路以及过流保护电路。最终实现小于0.5%的电压调整率和1%的负载调整率。Buck DC switching power supply has the advantages of low power consumption, high efficiency and wide output voltage range, which makes it play an important role in today＇s electronic devices. In this paper through the study of Buck Switching DC regulated power supply conversion mechanism, to buck DC switching regulator power supply model and the circuit is designed, and the circuit model through theoretical calculation and are performed to verify the circuit, according to the analysis of the circuit of power conversion, output voltage and ripple, Buck DC switching regulator power supply voltage regulation, load regulation and voltage fluctuation influence. The whole circuit is designed using LM5117 master chip, through the MOS CSD18532KCS field effect transistor regulation circuit, to achieve the stable output voltage. The circuit comprises a LM5117 buck the chip, drive circuit, H bridge circuit, filter circuit, self holding circuit and over-current protection circuit. The voltage regulation rate of less than 0.5% and the load regulation rate of 1% are finally realized.

关 键 词：降压型直流 开关稳压电源 电压调整率 负载调整率 电路设计 

分 类 号：TN86[电子电信—信息与通信工程]