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为串口屏供5V电时，电压不稳定，5V输出电压如图。（串口屏工作电流550mA）
HI
TEST2处是否有电压干扰？ 输出被拉低负载上是否有改变？
为串口屏供5V电时，电压不稳定，5V输出电压如图
。（串口屏工作电流550mA）