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XTR105参照数据手册设计的,为什么恒流源输出电流不对,如图所示

Other Parts Discussed in Thread: XTR105

如图所示:按照数据手册上所说:1、14脚输出应该为0.8mA,实际测量的如图所示,7脚输出电流,按照计算应该为3.5mA左右,但实际测量:2.28mA左右,望请帮忙看一下,是什么原因呢?