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DRV8323: 放大器输入SPx和SNx差分电压很小,且SOx无输出

Part Number: DRV8323

  你好,我设计了一个电机驱动,目前电机已经驱动起来,但是在电流采样时SPx和SNx电压差很小。Rsensor用的是20mΩ,测试电机线上的电流有5A时,SPx和SNx电压差只有15mV,且放大器无输出。CSA寄存器配置为默认值。原理图及Layout如图,高亮部分时放大器的输入和输出网络