Hi
I have a query need your help.
The setting as below:
The OCC threshold is 2mv, R-sense resistor value of 0.5 milliohms, delay time is 100, and recovery threshold 0.
After the OCC is triggered, the current is cut off. If the DMOS is turned off and the CMOS is turned on, the OCC will not recover.
If both the CMOS and DMOS are turned off, the OCC can recover normally.
Does it normal?
Waiting for your reply.
Thanks
Star
Hi Star,
See below from the TRM.
The minimum threshold for OCC is 4mV. The threshold register setting uses 2mV units, so a setting of 2 equals a 4mV threshold, see below.
To answer your question, OCC turns off the CHG FET, so the current should stop and if a load is attached the voltage on the PACK pin should drop below the recovery threshold, either allowing the device to recover from the protection. If the CHG FET does not turn off, then the current would have to drop below the recovery threshold for the duration of the recovery time in order for the device to recover.
I recommend reading Section 5.2.7 of the TRM for more information on OCC and how the device recovers from it.
Regards,
Max Verboncoeur
