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XTR111为啥不能正常工作

Other Parts Discussed in Thread: XTR111

请大家帮忙分析一下,这个电路XTR111为啥不能正常工作,直接用电流表测试电流很大,达到45mA,而且接负载电流会变小,如接120欧姆,电流会变成25mA,这根本就不是电流源