I calculated the thermal resistance between the ends of a Coilcraft
The heat source is a Supertex depletion fet. I'm seeing about 83 K/W, which still feels high but is believable.
Probably a factor of 2*pi or something in your math, I'm always checking my math with electronics. If you were a physics type, then within a factor of ten is close enough. :^)
Hey here's a crazy (too expensive) idea, copper clad with single loops of copper, wrapped by hand over some form...? maybe a coil 'embedded' into the pcb, soldered into place.
George H.
I based the thermal resistance on the specified electrical resistance. The ratio for copper is about 150,000 K/W per ohm.
Maybe there is short-cut thermal coupling between the coils or something.
Anyhow, the low theta will help keep the inner turns cool.
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