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DRV8889-Q1: Effect of current value on torque count

Part Number: DRV8889-Q1

Hello, team.

As shown in the figure below, when I change the current value to 0.4 [A] and move the motor, the maximum torque count remains the same as 0.2 [A] and the torque count when it decreases is greater than 0.2 [A]. Could you tell me why this happens?

I am sorry to trouble you, but I would appreciate your reply.