基于LM25116的车用开关电源

On the Automotive Switching Power Supply Based on LM25116

设计了一种基于LM25116的车用开关电源,输入直流电压为24 V,输出电压为12 V。采用BUCK电路拓扑结构,将阻抗较小的MOS管代替传统的二极管,以实现同步整流,提高电源的输出效率。分析了主电路、控制电路、驱动电路的工作原理。实物测试结果表明,本电路能稳定输出电压,输出效率可达90%以上,性能满足设计要求。

A kind of automotive switch power supply, which is based on LM25116, has been designed, with 24 V its input DC voltage, and 12 V its output DC voltage. By adopting BUCK circuit topological structure, the system substitutes MOS tubes with lower impedance for the traditional diodes, thus achieving the synchronous rectification and improving the efficiency of the power output. A thorough analysis has been made of the working principles of the main circuit, the control and drive circuit. The experimental results show that a stable output voltage can be achieved, with an output efficiency even higher than 90%, an indication that its function and performance meet the design requirements.