[Amps] 50V FET output transformer
manfred at ludens.cl
Wed Jul 23 13:42:51 EDT 2014
> Has anyone built an output transformer for a 50V LDMOS FET (Freescale
> device) that could lend some help with this?
I have some experience with such transformers. Not specifically with the
Freescale devices, but that shouldn't matter. Also with 100V supplies.
> By my estimation a 16:1 constructed of (2) 4:1 Guanella?s should give a
> satisfactory match to 50 ohms.
As long as they are for the correct impedances, yes. Building a Guanella
transformer for 3.1:12.5 ohm isn't entirely trivial.
> The XFMR I've built currently only gives about 33% efficiency.
Tell me the details of its construction, and I should be able to suggest
improvements. Most likely the leakage inductance is killing it.
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