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170 degrees c ambient too hot for ferrite?

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If there's no risk to reach the Curie point by additional power dissipation, why should it be a problem?
 
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It seems to me that for a gate drive transformer you want the highest Ui you can get. And for the high temperature drilling project you want the highest curie. It looks to me that the best material in that pdf is N95. The drawback is limited core shapes.
 

N88 a good choice too....
 
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One of the key parameters in very high temp supplies is -as others have mentioned- minimize self heating.
This usually means, among other things, utilizing components at a small fraction of their 25C ratings. For a transformer, this would mean an oversize core and a very large copper cross section.
 
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