Re: [TCML] Silicon Carbide MOSFET for SSTC designs

[Steve Ward <steve.ward@xxxxxxxxx>]

While these new SiC devices are very fast switching, they still have rather
poor conduction losses compared to even "cheap" MOSFETs and IGBTs.  Unless
you are trying some exotic, very high frequency SSTC (in the MHz range),
then i see no reason to use these SiC fets.  They will probably perform
worse than a 5 dollar MOSFET or IGBT that switches 2-3 times slower but has
2-3X less conduction loss.

I also dont see how this sort of thing could ever replace the IGBT, at least
for folks like me who exploit the IGBTs ability to handle tremendous peak
currents.  These SiC things look like they have a fixed on resistance, which
means their losses go up with the square of the current.  IGBTs maintain
relatively low voltage drop even with pulses 10X their average current
rating, and as far as i can see, SiC inherently cant do this.

$46 for one of those sounds pretty absurd, i bet they dont get used much
yet.

Steve

On Thu, Jun 16, 2011 at 1:28 PM, <jeremyee@xxxxxxxx> wrote:

> List,
>                 Just came across this device from Cree (
> http://www.cree.com/products/pdf/CMF10120D.pdf) and was wondering how it
> would work in an SSTC application. The snippet from the article in High
> Frequency electronics states that it will be a replacement for Silicon
> IGBTs. I have not yet endeavored down the solid state tesla coil road but
> thought this part might be of interest and I am curious what the solid state
> experts think. This part is $46 on Digi-key. Hope everyone is doing well!
>
> Jeremy
> Cincinnati, Ohio
>
> Sent from my BlackBerry device from Cincinnati Bell Wireless
> _______________________________________________
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>
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