We have a power supply in our equipment (30V, 2.5A) in which we use a TOP250YN. We have produced the equipment for almost 2 years without problem.
However in this january and february 2016 about 30% of power supplys present a problem. They turn off as if heating up to limiting temperature. After cooling down it turns on again. The temperature measured on TOP surface is only around 40 ºC. The correction for the problem is just changing for a new TOP. The percentage of defcts is too high. It appears to be LOT dependent.
How can we solve this problem??