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DRV8825: Noise and current distortion

Part Number: DRV8825

Hi Team

Customer are using our DRV8825 to drive a stepper motor which spec show as following. and the VM=24V, I_Chop=2A, 1/32microstep. When it works at 4000 step(1.8°)/s, the phase current show as following, and there is distinct noise.  Can you help to show your comments why does this phase current distortion happen?