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XTR115输出电流不变的问题

Other Parts Discussed in Thread: XTR111

这是115的电路图,

当Vin接地时,输出电流为7.1mA
当Vin接5V时,输出为32.4mA
当Vin为1.0V 时,输出也为32.4mA
请问这是为什么呢???