Part Number:DRV8871
Hi,
I have an application where I drive a miniature peristaltic pump using the DRV8871. Its worked great in the past with no issues. I purchased a new batch that's going on an existing board. The trouble is now only out2 works. Out1 fails to drive at all.
I have tried every combination of options trying to resolve it
Another chip (same batch) Same issue
Swapping the inputs, Same issue
Changed the ilim resistor from 15k to 22k same result no drive on Out2
I dug out an old working board and swapped the old chip with the new and it is the same no drive on Out2
So yesterday I ordered direct from TI a new batch, but looking at the tracking it seems to be coming from Digikey where I purchased the last batch.
Is there any other way to diagnose why only Out2 is working? I have on order some DRV8870 so will see what happens with that (I know about the ilim change, I will tie 5v to the input and keep ISEN tied to Grnd)
Thanks
Tim Box