Part Number:DRV8873
Hi,
Back EMF can be an issue if the motor turns while the IC is not powered.
About Phase node output pin, Abs Max Ratings is VM+1V in datasheet.
For example, BEMF is 12V by the motor turns while the IC is not powered.
Then, VM pin is up to 11.2V. This cause is to supply power by BEMF through body diode of internal high side FET.
0.8V is forward voltage of body diode(12V-0.8V=11.2V).
Here, I have a question.
Body diode of internal high side FET can be too hot at this time.
Can TI show the abs max ratings of body diode current?
How can we define acceptable body diode current of this IC at this time?
Best regards,
Shimizu