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I assume you mean voltage regulator not variator. If you have a thermometer, I would hold it against the parts and see what the actual temperature is.
If the temperature is somewhere between 40-50 degrees C. that would not be excessive. 80 C would be excessive. There are electronic parts like electrolytic capacitors what have maximum operating temperature ratings of around 85 C. to 100 C. so you would want some design margin if it is a lower end part.
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