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OPA354A-Q1: 电机电流采样运放输出异常

Part Number: OPA354A-Q1

如上图,在TINA中模拟的电机单电阻电流采样,输出正确。

但是在实际电路中,只要给驱动板上电,采样电阻上根本没电流流过,但是输出端却有2V的电压。

另外,对于三相PMSM的单电阻电流采样,运放的选择需要注意哪些参数?