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UC2845AQ: UC2845A Question about noise and temperature.

Part Number: UC2845AQ
Other Parts Discussed in Thread: UC2845A, TEST

Dear support member,

My customer made UC2845A board.
I have a question about noise and temperature.


(Situation)
After turning on the power, after several minutes it is operating as designed and operating stably.

But after that time, the ON duty of switching becomes unstable and abnormal oscillation has occurred.


(Question)
Switching has abnormally oscillated after a while.

Q1
Is this not related to temperature rise?

Q2
I think that the noise increases by changing the temperature characteristics inside the parts such as control IC and FET.
Have you ever received reports that noise increases with temperature?


Best regard.
Bob Lee.