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tech / sci.electronics.design / Re: 4500 volt mosfet

SubjectAuthor
* 4500 volt mosfetjlarkin
+* Re: 4500 volt mosfetDecadentLinuxUserNumeroUno
|`- Re: 4500 volt mosfetjlarkin
+- Re: 4500 volt mosfetRhydian
+- Re: 4500 volt mosfetPhil Allison
`* Re: 4500 volt mosfetJoerg
 `- Re: 4500 volt mosfetJohn Larkin

1
4500 volt mosfet

<8gdveg1188en4vg0bphd53vsicu588ce42@4ax.com>

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From: jlar...@highlandsniptechnology.com
Newsgroups: sci.electronics.design
Subject: 4500 volt mosfet
Date: Wed, 14 Jul 2021 21:19:37 -0700
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 by: jlar...@highlandsniptechnology.com - Thu, 15 Jul 2021 04:19 UTC

https://www.digikey.com/en/products/detail/ixys/IXTT02N450HV/3737633?s=N4IgTCBcDaIJYA8AuSAMYB2IC6BfIA

Rds_on is < 625 ohms! More like a tube!

It sure Spices nice.

https://www.dropbox.com/s/wlpc73azpm0iyzn/T855_Totem_2.jpg?raw=1

--

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

Re: 4500 volt mosfet

<scoffn$5ka$1@gioia.aioe.org>

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From: Decadent...@decadence.org
Newsgroups: sci.electronics.design
Subject: Re: 4500 volt mosfet
Date: Thu, 15 Jul 2021 05:01:43 +0000 (UTC)
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 by: Decadent...@decadence.org - Thu, 15 Jul 2021 05:01 UTC

jlarkin@highlandsniptechnology.com wrote in
news:8gdveg1188en4vg0bphd53vsicu588ce42@4ax.com:

>
> https://www.digikey.com/en/products/detail/ixys/IXTT02N450HV/373763
> 3?s=N4IgTCBcDaIJYA8AuSAMYB2IC6BfIA
>
> Rds_on is < 625 ohms! More like a tube!
>
> It sure Spices nice.
>
> https://www.dropbox.com/s/wlpc73azpm0iyzn/T855_Totem_2.jpg?raw=1
>
>
>
>

Ya saw how far apart them thar legs are.

At those potentials everything would need to be potted.

Incorporate at full potential very carefully (planning and
engineering).

Re: 4500 volt mosfet

<scorsd$el2$2@dont-email.me>

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From: new...@rblack01.plus.com (Rhydian)
Newsgroups: sci.electronics.design
Subject: Re: 4500 volt mosfet
Date: Thu, 15 Jul 2021 08:33:17 -0000 (UTC)
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 by: Rhydian - Thu, 15 Jul 2021 08:33 UTC

On Wed, 14 Jul 2021 21:19:37 -0700, jlarkin wrote:

> https://www.digikey.com/en/products/detail/ixys/IXTT02N450HV/3737633?
s=N4IgTCBcDaIJYA8AuSAMYB2IC6BfIA
>
> Rds_on is < 625 ohms! More like a tube!
>
> It sure Spices nice.
>
> https://www.dropbox.com/s/wlpc73azpm0iyzn/T855_Totem_2.jpg?raw=1

That data sheet is a bit sneaky. The DC specs (fig 13 and 14) are
nowhere near as impressive as the headline figures.

But, given that a lot of your designs are about making crazy-fast pulses,
that might not matter.

Re: 4500 volt mosfet

<0852fc0e-2a44-4c19-b447-e3b48215d1aen@googlegroups.com>

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Subject: Re: 4500 volt mosfet
From: palliso...@gmail.com (Phil Allison)
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 by: Phil Allison - Thu, 15 Jul 2021 09:37 UTC

jla...@highlandsniptechnology.com wrote:

==============================
> https://www.digikey.com/en/products/detail/ixys/IXTT02N450HV/3737633?s=N4IgTCBcDaIJYA8AuSAMYB2IC6BfIA
>
> Rds_on is < 625 ohms! More like a tube!
>

** OK - which tube then ??

How about the venerable 6BQ5 ??
With 100V on the plate, it will pass over 150mA = 600 ohms Rpk on.
Max plate V is speced at 1100V - it will easily take double that without breakdown.

Transconductance is about 12mA/V = well less than a MOSFET, but not bad thing with kV of output signal involved.
Dissipation is 12W long term, 10 times that ( 150mA at 800V) for a few seconds without failure.
That big lump of steel ( the plate ) takes some time to get red hot.

OTOH the MOSFET chip will fail in sub 1 mS if abused like that.

Tubes can actually arc over internally from extreme plate voltages without failure, particularly all glass types like the 6BQ5.
AKA the EL84 to non Yanks .....

FYI:

I have a test rig here that uses a pair in P-P, 650V on the plates and 325V on the screens.
Operated in Class AB.
Outputs 60W of clean, sine wave power without distress.

....... Phil

Re: 4500 volt mosfet

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From: jlar...@highlandsniptechnology.com
Newsgroups: sci.electronics.design
Subject: Re: 4500 volt mosfet
Date: Thu, 15 Jul 2021 07:05:27 -0700
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 by: jlar...@highlandsniptechnology.com - Thu, 15 Jul 2021 14:05 UTC

On Thu, 15 Jul 2021 05:01:43 +0000 (UTC),
DecadentLinuxUserNumeroUno@decadence.org wrote:

>jlarkin@highlandsniptechnology.com wrote in
>news:8gdveg1188en4vg0bphd53vsicu588ce42@4ax.com:
>
>>
>> https://www.digikey.com/en/products/detail/ixys/IXTT02N450HV/373763
>> 3?s=N4IgTCBcDaIJYA8AuSAMYB2IC6BfIA
>>
>> Rds_on is < 625 ohms! More like a tube!
>>
>> It sure Spices nice.
>>
>> https://www.dropbox.com/s/wlpc73azpm0iyzn/T855_Totem_2.jpg?raw=1
>>
>>
>>
>>
>
> Ya saw how far apart them thar legs are.
>
> At those potentials everything would need to be potted.
>
> Incorporate at full potential very carefully (planning and
>engineering).

At 40 volts/mil creepage, that fet is good for 8 KV or so. One could
put a little slot in the board too. Or a dab of conformal coat around
the pins.

I'd expect the silicon to break down before the pcb insulation does.
I'll have to test one and see what actually happens. I have an old
Spellman 30 KV supply that might still work.

--

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

Re: 4500 volt mosfet

<ilb7oiFjti7U1@mid.individual.net>

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From: new...@analogconsultants.com (Joerg)
Newsgroups: sci.electronics.design
Subject: Re: 4500 volt mosfet
Date: Thu, 15 Jul 2021 09:57:54 -0700
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 by: Joerg - Thu, 15 Jul 2021 16:57 UTC

On 7/14/21 9:19 PM, jlarkin@highlandsniptechnology.com wrote:
>
> https://www.digikey.com/en/products/detail/ixys/IXTT02N450HV/3737633?s=N4IgTCBcDaIJYA8AuSAMYB2IC6BfIA
>
> Rds_on is < 625 ohms! More like a tube!
>
> It sure Spices nice.
>
> https://www.dropbox.com/s/wlpc73azpm0iyzn/T855_Totem_2.jpg?raw=1
>
>

But a tube costs less and, if picking a Russian one, is more available
right now :-)

--
Regards, Joerg

http://www.analogconsultants.com/

Re: 4500 volt mosfet

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From: jlar...@highland_atwork_technology.com (John Larkin)
Newsgroups: sci.electronics.design
Subject: Re: 4500 volt mosfet
Date: Thu, 15 Jul 2021 11:13:56 -0700
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 by: John Larkin - Thu, 15 Jul 2021 18:13 UTC

On Thu, 15 Jul 2021 09:57:54 -0700, Joerg <news@analogconsultants.com>
wrote:

>On 7/14/21 9:19 PM, jlarkin@highlandsniptechnology.com wrote:
>>
>> https://www.digikey.com/en/products/detail/ixys/IXTT02N450HV/3737633?s=N4IgTCBcDaIJYA8AuSAMYB2IC6BfIA
>>
>> Rds_on is < 625 ohms! More like a tube!
>>
>> It sure Spices nice.
>>
>> https://www.dropbox.com/s/wlpc73azpm0iyzn/T855_Totem_2.jpg?raw=1
>>
>>
>
>But a tube costs less and, if picking a Russian one, is more available
>right now :-)

Just need the tube and a floating grid driver and a 4500 volt isolated
filament transformer. All surface mount of course.

I just got some Ixys mega-dpak parts to play with, so they seem to be
available. I'll crank up the old Spellman and blow some up.

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