I'm trying to build an SMPS in low volume (read 1-10 units).  I don't 
want to use an off-the-shelf solution for a number of reasons that I'd 
rather not get into.

I'm looking for a transformer which can handle 400V @ (2A avg, 2.5A 
peak) on the primary side and 12V@(25A avg, 32A peak). Total power 
transfer is 300W.  Turns ratio between 15:1 and 25:1.  Permeability must 
be ~300, so a gapped core is necessary.  Operating frequency must be >= 
700kHz (1MHz prefered)

I don't know where to look for such a beast.  I've been through digikey 
and mouser with no luck, I've tried google and I'm out of ideas.

I don't mind winding my own transformers for the volumes I'm doing, but 
then I need a source of cores which can handle that frequency and 
power.  I also need to know if there are any special considerations for 
winding 1MHz transformers.

Any ideas on sources would be greatly appreciated.

Thanks,
Brendan


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