Inrush transients, Thermal question

Part Number:DRV8801A-Q1

Hi Motor Drive Team,

My customer is seeing a significant inrush current when starting the the motor from cold when the motor initially tries to move with the DRV8801A.

With the current limit resistors the worst case scenario looks something like below (2.3A for 150ms followed by 500mA steadystate for 5.85s):

We're trying to understand if inrush transient can cause any thermal concerns or what the thermal rise might be from this.

I see that the worstcase rds,on is about 0.75ohms:

And the theta,ja is 36.8:

From this it looks like the steady state thermal rise at 2.3A would be 146 degrees, but I'm not sure how to look at this for a 150ms transient.

Thanks for all the help!

Best,

David