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DRV8412: Over current protection threshold

Part Number: DRV8412

Hi there,

I use one DRV8412 to drive one brushed DC motor. The DRV8412 working mode is mode3. IN pin is driven by 40KHz 80% duty cycle PWM. The resistor on OC_ADJ pin is 120K ohm.

According to table 2 on datasheet, the OC threshold is 2.4A with 120K ohm. However, my test result shows the OC threshold is about 4.4A. Why is that?

Below is my capture: Channel 1 current on DC motor, Channel 2 Differential voltage on DC motor terminal, Channel 3 PWM drive signal on IN pin.