NSLMZ14203H输入42V输出3A电源的实现.docx

PAGE 1 PAGE 1 NSLMZ14203H输入42V输出3A电源的实现  LMZ14203H电源模块适用于6V至42V的输入电压轨，并可供应可调的高精度输出电压，其电压值可达24V.工程师只需使用一个电阻便可调整开关频率，这令电路设计具有更大的敏捷性。这款电源模块除了可与同系列的其他型号引脚兼容外，还集成了隔离电感器，令其效率可高达97%.集成的电感器可以减轻电磁干扰（EMI），令这几款电源模块符合 CISPR 22 B 类电磁波辐射及传导放射等标准的规定。LMZ14203H电源模块可驱动1A至3A的负载，适用于采纳分立式负载点架构（POL）的供电系统，并可在系统中生成中间总线电压。超高效率与出众的热性能令这三款电源模块抱负用于无法通风散热的系统。此外，这几款产品与特别应用电路搭配使用时，可生成-15V 的偏压供电，令音频放大器（例如美国国家半导体的LME49880芯片）可以获得更宽的动态范围。  LMZ14203H: 3A SIMPLE SWITCHER? Power Module with 42V Maximum Input  The LMZ14203H SIMPLE SWITCHER power module is an easy-to-use step-down DC-DC solution capable of driving up to 3A load with exceptional power conversion efficiency, line and load regulation, and output accuracy. The LMZ14203H is available in an innovative package that enhances thermal performance and allows for hand or machine soldering.  The LMZ14203H can accept an input voltage rail between 6V and 42V and deliver an adjustable and highly accurate output voltage as low as 5V. The LMZ14203H only requires three external resistors and four external capacitors to complete the power solution. The LMZ14203H is a reliable and robust design with the following protection features: thermal shutdown, input under-voltage lockout, output over-voltage protection, short-circuit protection, output current limit, and allows startup into a pre-biased output. A single resistor adjusts the switching frequency up to 1 MHz.  LMZ14203H电指标：  ■ Up to 3A output current  ■ Input voltage range 6V to 42V  ■ Output voltage as low as 5V  ■ Efficiency up to 97%  LMZ14203H主要特性：  ■ Integrated shielded inductor  ■ Simple PCB layout  ■ Flexible startup sequencing using external soft-start and precision enable  ■ Protection against inrush currents  ■ Input UVLO and output short circuit protection  ■ –40℃ to 125℃ junction temperature range  ■ Single exposed pad and standard pinout for easy mounting and manufacturing  ■ Low output voltage ripple  ■ Pin-to