Re: Pushing a TL494

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Brett Miller <brmtesla2@xxxxxxxxx>

Steve,

Awesome, that's good news for me too since I've wanted
to try an audio modulation project with either a
flyback driver or a small single MOSFET SSTC.

Of course a flyback runs plenty slow enough for the
494.

-Brett


--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: "Steve Ward" <steve.ward@xxxxxxxxx>
>
> Ive run the TL494 at 1MHz in the past.  Im guessing
> the upper
> frequency limit is given either because the slow
> output drivers (open
> collector / open emitter, depending on
> configuration) or because maybe
> the deadtime control is out of spec or something
> along those lines
> (perhaps a slow comparator for the DTC is used
> internally).  Anyway,
> it should work ok.
>
> Steve Ward
>
> On 4/5/07, Tesla list <tesla@xxxxxxxxxx> wrote:
> >Original poster: "Joshua Johnson"
> <jjohnson98@xxxxxxxxx>
> >
> >I am trying to throw together a audio modulated
> SSTC. The
> >secondary/topload I am going to use looks like 400
> to 500 kHz for a
> >resonant frequency. I was wondering if I could
> stick with the TL494
> >controller even though the spec sheet says it's
> only good to 300 kHz.
> >The Plasmasonic II setup,
>
><http://www.easternvoltageresearch.com/designfiles/plasma02_presentation.pdf>http://www.easternvoltageresearch.com/designfiles/plasma02_presentation.pdf
> >is tested to 400 kHz with the TL494. Can I push it
> a bit farther?
> >Anyone run at higher frequencies with this
> controller?
> >
> >I skimmed through Texas Instruments' SMPS
> controllers that handle
> >higher frequencies but they don't have the handy
> Dead-Time Controller
> >pin like the TL494 where you can just feed in the
> audio for modulation.
> >
> >Any ideas much appreciated.
> >
> >Thanks,
> >JJ
> >
> >
>
>
>
>
>




____________________________________________________________________________________
Now that's room service!  Choose from over 150,000 hotels
in 45,000 destinations on Yahoo! Travel to find your fit.
http://farechase.yahoo.com/promo-generic-14795097