摘 要 开关稳压电源具有集成度高、外围电路简单、电源效率高等长处,在多种电子产品中得到广泛的应用。尤其是基于电池供电的便携式系统数量日益增长 ,开关稳压电源已经取代效率较低的线性稳压器,成为现代超大规模集成电路系统中不可或缺的部分。本文重要研究降压型直流开关稳压电源。 本文首先简介了降压型开关稳压电路的概念，并在此基础上设计几种方案，通过比较与分析采用了基于同步降压控制器 LM5117PMHE，Mos 管 CSD18532KCS的 Buck 电路，并根据降压控制器和场效应管的特性进行了理论分析与计算。另一方面，本文运用 TI 在线仿真软件对理论计算进行了仿真验证，仿真成果与理论计算一致。最终，本文简介了测试方案与条件，并对测试成果进行了分析。关键词： 降压型直流开关稳压电源 LM5117PMHE CSD18532KCS Abstract Switching power supply has many advantages such as high integration, simple external circuit and high efficiency power supply. It has been widely used in various electronic products, especially with the growing number of portable systems, which based on battery-powered, switching power supply has been replaced by less efficient linear regulators and becoming an indispensable part of modern VLSI systems .This paper mainly studies a step-down switching regulator DC power supply. This paper introduces the concept of the stepdown switching regulator circuit, and shows several schemes on this basis. Analyzing and comparing with each schemes, we use a buck circuit which based on synchronous buck controller LM5117PMHE and MOSFET CSD18532KCS. According to the characteristic of buck controller and MOSFET，we have several analyses and calculations. Secondly, we use TI-online simulation software and the simulation results is consistent with the theoretical calculation. Finally, this paper describes the test schemes and conditions, and the test results are analyzed.Key words: Switching power supply, LM5117PMHE, CSD18532KCS一、设计任务及阐明1.1 ...
