I have designed one multi-output power supply for printing application.
kindly find an attached schematic.
I did my design and product is in production now.
but I am getting some random failures of PSU from the field.
Problem: one particular ic damaged/burning U3 (TOP258PN) kindly note schematic.
we are doing the burn-in test too before selling.
and getting damaged PSU from field after 2-3 months.
what is the reason getting damaged of one particular ic? and what precautions we have to take in production/design?