I noticed that the current protection is to detect the high-side FET, is it right?
The customer is worried one Motor wire is shorted to Vbat+.
Then there will be high current flowing through the low side FET.
If the OCP only detect the high-side FET current, Then DRV8243 can not detect the OCP.
The customer is worried about this working condition.
Can you explain this?
Hey Fabio,
Correct, the IPROPI current sensing is only on the high side FET as shown in the block diagram below. Same for the 1/2 bridge driver variant the DRV8143-Q1. This current sensing is used for ITRIP / current regulation.
OCP is a different feature, which is built into every FET. So no matter how the load is connected, OCP will still trip and protect the device. But for a HS load using just lower FET to switch you would not be able to use ITRIP regulation.
Best,
Jacob
