bountyhunter
- Joined Sep 7, 2009
- 2,512
No, no, and no. There is no manufacturer that leaves 60% of usable capacity in the garage when they spec their products. They spec what it is and what it does under the conditions they believe are reliable and give stated operating life and performance data. You can run it over spec, and the consequences are known.But have very likely been labeled with a good sized safety margin so a transformer rated at 2A AC absolute max will probably be usable in a DC supply supplying 2A absolute max.
No, no, and no. That number comes from a fairly complex mathematical analysis of the FWB/cap circuit which relates DC current to the AC RMS current. It is simply the factor to use to follow the transformer spec rating. It's not a "derating" at all, it is the translation of DC load current to AC winding current.i'm interested in your input finding out some good derating figures as the earlier quoted "DC amps = AC amps /1.7" is obviously way too conservative
I'll pass, but I can probably copy out the sections on the training material for the published app note I wrote on transformer ratings and post it.This is getting a bit off-topic so I'm happy to take this to a "transformer max safe ratings" thread if you like
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