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使用LM3424芯片,如何通过开关电路实现RSNS电阻并连一个电阻,如下图所示

想实现功能是;

       通过电阻来控制LED电流。

问:

      如何实现Rsns电阻并联,通过MOS或三极管开关电路实现电阻并联

      MOS管 G极 与三极管基极  电压 已设置可以0V或者5V输入。