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关于TI的电流检测芯片INA282的一点问题

Other Parts Discussed in Thread: INA282

使用TI的电流检测芯片INA282,供电电压为18v,采样电阻为20mΩ,当流过采样电阻的电流为0.1A时,输出电压为9.07V,之后电流每升高0.1A,输出电压升高0.1v左右。可是INA282是放大50倍的啊,怎么会是在一个9V电压上的一个线性输出,而不是从0-50V的线性输出呢?