Low power (ultra) high voltage MOSFET

[Ad Sprenkels]

Hi All,

First post here...
Anyone knows if they even exist and where to get an N-channel Mosfet capable
of Vds>2000V at currents up to 1mA?

More detail: Vds>2000V, Vdg>2000V, Id < 1mA and VT 3-10V.

Thanks for any hint or comment,
Best regards,
Ad

 

[MooseFET]

Hi All,

First post here...
Anyone knows if they even exist and where to get an N-channel Mosfet capable
of Vds>2000V at currents up to 1mA?

More detail: Vds>2000V, Vdg>2000V, Id < 1mA and VT 3-10V.

Thanks for any hint or comment,
Best regards,
Ad

I don't thuink there are any they meet this. You may have to build
some sort of cascode circuit. Mosfets like the DN3145 from Supertex
would allow a few hundred volts per stage of the cascode. Depletion
mode devices have advanages in the later stages of a cascode. You can
make their gate voltages from the drain voltage of the last device.
This makes for good sharing of the power all the way down to ground.

 

[Ad Sprenkels]

Thanks for your comment!

I did indeed some experiments with two 1200V (enhancement) Mosfets in a
cascode like circuit, but has resulted in a rather complicated circuit.
I was wondering whether anyone on this forum would know about different
devices. It would simplify the circuit tremendously.
Thanks again,
Ad

 

[D from BC]

Thanks for your comment!

I did indeed some experiments with two 1200V (enhancement) Mosfets in a
cascode like circuit, but has resulted in a rather complicated circuit.
I was wondering whether anyone on this forum would know about different
devices. It would simplify the circuit tremendously.
Thanks again,
Ad

[snip]

Maybe check out tube technology..
D from BC

 

[Marte Schwarz]

Hi Ad,

OK, not exact fit but may be ;-)

look to www.IXYS.com IXLF19N250A

OK it is built for 19 A but the rest may be OK

Marte

 

[Ad Sprenkels]

Hi Marte,

Thanks for the info!
I have spoken to the rep here in the Netherlands about these devices (IGBT)
but they accept only a minimum order of 24 pieces costing about $105 each.
This is beyond my budget....
Anyway, thanks very much and I will try to find another supplier with a more
appropriate offer.

Best Regards,
Ad

 

[Phil Hobbs]

Hi Marte,

Thanks for the info!
I have spoken to the rep here in the Netherlands about these devices (IGBT)
but they accept only a minimum order of 24 pieces costing about $105 each.
This is beyond my budget....
Anyway, thanks very much and I will try to find another supplier with a more
appropriate offer.

Best Regards,
Ad

Sounds like a job for a tube. Last time I needed to do this sort of
thing I used an 811A--I really really needed low capacitance as
well--about 5 pF iirc. That was in about 1990, not 1960, btw. Tubes
are really amazing for that sort of job--they're not only for separating
fools from their money.

Cheers,

Phil Hobbs

 

[Ad Sprenkels]

Sounds like a job for a tube. Last time I needed to do this sort of thing
I used an 811A--I really really needed low capacitance as well--about 5 pF
iirc. That was in about 1990, not 1960, btw. Tubes are really amazing
for that sort of job--they're not only for separating fools from their
money.

Cheers,

Phil Hobbs

Hi Phil,

Thanks for the advice.
I am really going to look for the tube solution, although I am not very
familiar with using tubes.
Perhaps a nice time to learn something new...
Thanks again,
Ad

 

[Marte Schwarz]

Hi Ad,

I have spoken to the rep here in the Netherlands about these devices
(IGBT) but they accept only a minimum order of 24 pieces costing about
$105 each.

Uff, few years ago I got samples for 20 EUR/piece. They told me that the
price in series production would be in this range, too. If you don't need
too much switching speed then you could use a series connection.
What's your goal? May be I can help more when I know what you want to do.
You may write me a mail. I'm not every day here, because there is too much
offtopic nowadays :-(

Marte