【摘要】 TI生产的LM3481将开关电源的输入电压范围降低到了一个新台阶,最低工作电压仅2.9 V。分析和研究采用PWM方法调制的高性能稳压控制芯片LM3481,以其为核心设计制作了一款体积小、功耗低、频率高、输入范围宽的DC/DC升降压型变换器,电路采用SEPIC拓扑结构。实测表明:LM3481DC/DC变换器特别适合于物联网中的小型太阳能供电系统对3.3V电压的需求,能够很好地将不稳定的太阳能板输出电压转换为稳定电压供负载节点长久使用。LM3481给出了一个比单靠电池供电更优化的电源解决方案。更多还原

【Abstract】 LM3481 is a power management production of TI,which makes a great progress in reducing the input voltage down to 2. 9v of switching power supply. As a high-performance voltage control chip using PWM,LM3481 has been studied and designed in this dissertation; the high efficiency SEPIC DC / DC converter realized by LM3481 has small volume,low power consumption,high frequency,and wide input range; it can easily convert unstable output voltage of solar panels to stability energy continuously in small solar power supply system. LM3481 is particularly suitable for the voltage demand of 3. 3V in the internet of things,and it can keep terminal node working long time,which puts forward an optimized power supply solution better than battery alone.更多还原