原理图如下，是按照官方给的图做了一点简化：
上电之后，pin5可以输出5.0v电压，比较正常。
但是当我再j2端调节电压从0-5v变化时，j1段测量到的电流一直是16ma左右，没有任何的变化。
请教一下是什么原因吗？
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