Derating Factor
Operating Temperature range is normally 0 to 50oC,
derate 20% for each additional 10oC increase above
50oC.
Operating Temperature range; 0oC to +70oC.
Full power to +50oC then derate 2.5%/oC to
+70oC. Or, derate linearly from 100% load @ 50oC to
75% @ 60, derated at 10% per oC to a Maximum of
+65oC
Forced air cooling [20CFM nominal]: a power supply may require a
forced air flow to operate at its rated maximum temperature rating.
Derate 20% with out cooling
Open Frame supplies: may require an additional 15% power de-rating
when covered by a frame.
About: The power supply specification should detail its operation,
use the above as a rule of thumb. Normal operational temperature range is
defined as ambient [Maximum].
A list of Power Supply manufacturers.
How to Derate; Guideline for Derating Electronic Components
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