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请教XTR115 为什么没有电流输出

Other Parts Discussed in Thread: XTR115

可以帮忙看看我的这个XTR115为什么没有电流输出呢?

CHNNEL0为3.3V,我测了一下Iin的电流,大约为0.19mA,Iout不是应该100*Iin,理论上应该上20mA左右,可以就是没有输出,地已经隔离了,可能会时哪里的问题呢?