基于 lm5117 的降压型直流稳压电源摘要：这个系统主要就是借助两种工具为核心器件，一种是降压控制器 LM5117芯片，另一种是 CSD18532KCS2MOS 场效应管,它们共同去组成同步整流电路,设计系统是一种降压型的直流开关条件下的稳压电源。测控模块的保护方法采用的是继电器过流,通过这种监控输出电流实现整个系统的过流保护。系统可以实现:输入的额定电压一定要在 16V 下,输出的电压最大偏差为 UO100mV,可以输出的最大的电流只可以达到 3A;可以输出的噪声纹波电压峰峰为 UOPP<50mV;UO 从满载变到 UOMAX,轻载 0.2imax 时,负载调整率为 0.04%;UIN 变化到 17.6V 和13.V,电压调整率是 0.06%;效率可达到大约 92.18%，具有过流保护功能,这种电源还具有一种负载识别的功能,能够帮助系统满足各种要求。关键词:降压芯片 LM5117;CSD18532KCS;同步整流;过流保护;负载识别Abstract: The synchronous rectifier circuit is composed of step-down controller LM5117 chip and CSD1853 2KCS2 Mosth field effect tube.The system is designed as step-down dc switching voltage stabilizing power supply. The measurement and control module adopts relay overcurrent protection and monitors the output current to realize overcurrent.Protection. The system can achieve: rated input voltage 16V, output voltage deviation UO100mV, the maximum output current up to3 A; Output noise ripple voltage peak-to-peak value UOPPmV; 1o from full load to Omax light load 0.2imax, negative.Load adjustment rate is 0.04%; UIN changes to 17.6v and 13.v, and the voltage adjustment rate is 0.06%. The efficiency can reach 92.18%.With over current protection function, the power supply has load identification function. The system meets all requirements.Key words: step-down chip LM5117; CSD18532KCS; Synchronous rectifier; Overcurrent protection; Load identification目录方案描述............................................................2 1 系统方案论证与选择...............................................21.1 抑制纹波电压.............................
