Greetings everyone,
So for a project of mine, I am using TI's DRV 8801 H bridge and found a strange issue with the OCP. The datasheet states that the OCP kicks in when the voltage on the SENSE pin exceeds 500mV, but in my case it kicks in at 100mV.
Now the weird part is that the output of the H bridge for current sense is another pin called VPROPI (Voltage proportional to current) which multiplies the voltage from the SENSE pin by 5. I guess this is done to allow for a smaller sense resistor. What bothers me is that the proportion of my error is the same. The OCP kicks in at 5x less than it should. On the other hand, it makes no sense for the VPROPI pin to be saturated at 500mV...
The issue exists on all of my boards (around 30 H bridges).
I have asked TI's support and they told me to ask my distributor for support because "we (TI) are less technical but sometimes we can help out". So I asked Farnell, who apparently has an "internal link with a team of TI dedicated engineers for technical support", but got no answer.
Has anyone encountered similar issues with the OCP on TI devices? Or am I missing something entirely.