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R: [TCML] ESBT Transistors now available in Tesla hobbiest quantities
I have had 5 years ago from ST, some engineering sample of T0247-4L
STL12IE90 (12A 900V) and isotop STE50DE100 (50A 1000V) of these ESBT The
first is now in production as STC20DE90HV But I never tested them. In
past I used this cascode configuration when high voltage mosfet was
expensive but today these are no reasons to use it. Seeing ST actual
production I concord with Steve The current capacity is too weak in
order to meet the hard working in a TC.
Vladi Mazzilli
-----Messaggio originale-----
Da: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] Per conto
di Steve Ward
Inviato: giovedì 7 gennaio 2010 23.38
A: Tesla Coil Mailing List
Oggetto: Re: [TCML] ESBT Transistors now available in Tesla hobbiest
quantities
I honestly dont see the benefit, other than the high voltage rating
(which you dont really need). The current capacity is pretty weak, and
the "low" on resistance aint all that low compared to good mosfets or
good IGBTs.
The switching at 150khz sounds highly optimistic given their storage
time (turn off time) being several hundred nS on the one datasheet i
looked at.
Powerful SSTCs (or SSTCs of any kind) have to deal with large reactive
currents, so these devices are pitiful when compared to IGBTs that can
effortlessly do 10's to 100's to 1000's of amps and switch just as fast.
Sorry to rain on a parade, but im just giving my opinion: i dont think
these ESBTs are particularly useful for us. The applications they list
(line operated flyback converter) DOES sound like a great use for them,
but that really doesnt make for a good tesla coil drive, at least not
compared to devices that are currently available in the IGBT and MOSFET
variety.
Steve Ward
On Thu, Jan 7, 2010 at 7:37 AM, Bert Pool <micro_wave@xxxxxxxxxxx>
wrote:
> A friend of mine sent me an e-mail this week with links to the Mouser
> site on the ESBT, Emitter Switched Bipolar Transistors. It's my
> understanding that these transistors have been out there about five
> years, but available only if you bought large batches. Now we can buy
them in small quantities
> at very affordable prices. (no, I have no Mouser or STMicro stock
:>)
>
> What do these transistors do for us?
>
> 1) very low "on" resistance, 0.075 ohms
> 2) 8 amps at 1500 volts (there is one version that will do 4 amps at
> 1700
> volts)
> 3) switching speeds of 150 kilohertz
> 4) price of $8.75 in onesies, $7.70 in lots of 10, $6.30 in lots of
100
>
> Mind you, these are the published maximum ratings - no coiler worth
> his salt would run one with out trying to push it at least 25% to 50%
> beyond those ratings (and a few of you would try way more than that!)
>
> I foresee some very affordable, very powerful SSTC's being built by
> members of this list based upon this technology.
>
> Link to the Mouser catalog page on these parts:
> http://www.mouser.com/Search/Refine.aspx?Keyword=esbt
>
> Link to more information on ESBT transistors and what they are and how
> they
> work:
>
http://www.st.com/search?q=esbt&ud=1&sort=date%3AD%3AL%3Ad1&output=xml_n
o_dtd&entqr=3&entsp=a&access=p&oe=UTF-8&ie=UTF-8&client=ST_COM_frontend&
proxystylesheet=ST_COM_frontend&site=ST_COM
>
> I want to thank Bob Paddock for sharing this info with us.
>
> Bert Pool
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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