This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8870: 该芯片的VREF引脚0V时电流控制异常?

Part Number: DRV8870
Other Parts Discussed in Thread: DRV8251

Hi,all

我使用DRV8870做斩波恒流,DRV8870的VREF由DAC驱动,ISEN电阻为0.1Ω

我发现IN1或IN2给定运动方向时,即便VREF电压为0V,DRV8870并不会输出0A电流,大约有450mA电流输出,这与预期不一致

当给定1A的指令值时,DRV8870输出电流为1A,与预期一致

我看规格书里面写的VREF输入范围为0.3~4V,因此即便外部输入0V时,芯片内部是按照实际0.3V来控制电流么?

TI有相似的pin2pin芯片支持VREF输入低至0V么?