Other Parts Discussed in Thread: UCC256402,
Tool/software:
Hello, we have a malfunctioning product equipped with the UCC256402. The board that supplies 12V from 72V stops functioning unexpectedly between 30 minutes to 72 hours for boards experiencing failures. According to the Excel calculation sheet, the components surrounding the UCC are chosen correctly. Numerous other component values besides those determined by this sheet have been tested without preventing the failure. We have been able to capture the precise moment when the failure occurs. During the failure, the board has a fixed load (tested with a resistive load). It appears that the MOS control signals stop being sent without reason. Indeed, we observe the current reversing on the ISNS pin, but the MOS controls do not change, and a few milliseconds later, both control signals drop to 0V. In order to get the board working again, it needs to be powered down and then powered back up. Do you have any elements that could explain this failure?
