[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Pushing a TL494
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