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'[EE]: High Voltage Transistors or Op Amps..'
2001\05\31@040446 by Jim Paul

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All,

Does anyone have any ideas for high voltage transistors?  I need some with
a BVCEO of between 1200 and 3000 VDC.  I know this is quite an order, but
I don't see any way aorund it at this time.  If no transistors are available, some
high voltage op amps are available from APEX, but at $550.00 per amp, and I
need two, that gets quite expensive.  Anyway, if anyone has any ideas, let me know.

                                                                       Thanks and Regards,

                                                                                   Jim

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2001\05\31@051612 by Roman Black

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Jim Paul wrote:
>
> All,
>
> Does anyone have any ideas for high voltage transistors?  I need some with
> a BVCEO of between 1200 and 3000 VDC.  I know this is quite an order, but
> I don't see any way aorund it at this time.  If no transistors are available, some
> high voltage op amps are available from APEX, but at $550.00 per amp, and I
> need two, that gets quite expensive.  Anyway, if anyone has any ideas, let me
> know.


That spec is often seen in the TV industry, not
common but available. Try some of the T0-3 types
used in older Sanyo sets, 2500v/3000v 5A is common.

Also, I have seen some TV manufacturers errata
sheets that show these transistors can be replaced
with more common (lower volt spec) types, usually
with the addition of a simple snubber consisting of
a 6kv ceramic and a resistor.

I think the big problem is the slew rate, if you slow
the change of voltage across the transistor, the
higher voltage can be better tolerated. From memory,
one errata sheet showed the 3000v transistor could be
replaced by a much more common 2000v one simply by
adding the snubber.

Hope that helps, I you want part numbers I can check
further. If you have a modern transistor book, look for
all the transistors marked as "TV h-out" and you should
find something. :o)
-Roman

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2001\05\31@052759 by Spehro Pefhany

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At 12:36 AM 5/31/01 -0500, you wrote:
>All,
>
>Does anyone have any ideas for high voltage transistors?  I need some with
>a BVCEO of between 1200 and 3000 VDC.  I know this is quite an order, but
>I don't see any way aorund it at this time.  If no transistors are
available, some
>high voltage op amps are available from APEX, but at $550.00 per amp, and I
>need two, that gets quite expensive.  Anyway, if anyone has any ideas, let
me
>know.

Also you'll be waiting a long time for anything from Apex.

As has been suggested, try horizontal output NPN BJTs for big-screen,
projection and
HD television sets. Probably Japanese manufacturers/part numbers.

Also you could consider IGBTs from places such as http://www.irf.com, they are
easily available and cheap at 1200V. AFAIK, there is nothing available that
is PNP
and very high voltage, so review your output topologies if you need
push-pull.

Best regards,
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2001\05\31@091328 by James Paul

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Roman,

Thanks.  Part numbers would be great.   Although this isn't
for a TV, I thought of HO transistors when I was asked to find
something.   I would appreciate some numbers though.

                                        Thanks and Regards,

                                               Jim



On Thu, 31 May 2001, Roman Black wrote:

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2001\05\31@092827 by David VanHorn

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At 12:36 AM 5/31/01 -0500, Jim Paul wrote:
>All,
>
>Does anyone have any ideas for high voltage transistors?  I need some with
>a BVCEO of between 1200 and 3000 VDC.  I know this is quite an order, but
>I don't see any way aorund it at this time.  If no transistors are
>available, some
>high voltage op amps are available from APEX, but at $550.00 per amp, and I
>need two, that gets quite expensive.  Anyway, if anyone has any ideas, let me
>know.

Look into transistors specified for Horizontal output service. These
usually run >1000VCE


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2001\05\31@142628 by Nigel Goodwin

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In message <RemoveME20010531131228.10766.cpmtaTakeThisOuTspamc004.sfo.cp.net>, James Paul
<spamBeGonejimspamBeGonespamJPES.COM> writes
> Roman,
>
> Thanks.  Part numbers would be great.   Although this isn't
> for a TV, I thought of HO transistors when I was asked to find
> something.   I would appreciate some numbers though.

The most common European numbers are BU208 (TO3) and BU508 (Plastic),
these can be used to replace line output devices in most TV's.
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2001\05\31@151154 by Roman Black

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Nigel Goodwin wrote:
>
> In message <20010531131228.10766.cpmtaEraseMEspam.....c004.sfo.cp.net>, James Paul
> <EraseMEjimspamJPES.COM> writes
> > Roman,
> >
> > Thanks.  Part numbers would be great.   Although this isn't
> > for a TV, I thought of HO transistors when I was asked to find
> > something.   I would appreciate some numbers though.
>
> The most common European numbers are BU208 (TO3) and BU508 (Plastic),
> these can be used to replace line output devices in most TV's.


Yep, BU508 are great, we use a lot each week.
They are only about 1500v, 8A 125w NPN,

2SD995 2500v 3A
Does that help?
-Roman

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'[EE]: High Voltage Transistors or Op Amps..'
2001\06\01@071922 by Spehro Pefhany
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At 06:12 AM 5/31/01 -0700, you wrote:
> Roman,
>
> Thanks.  Part numbers would be great.   Although this isn't
> for a TV, I thought of HO transistors when I was asked to find
> something.   I would appreciate some numbers though.

Consider a 2SC4760, Vcbo = 2,000 V, Ic = 8A, Pd = 200W (Tc = 25'C).

Best regards,


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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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2001\06\01@103123 by James Paul

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Thanks to all who replied to this request.  I appreciate the help.
These transistors are to be used in an electrostatic deflection
project.  Current handling and power handling capability are of
only minor importance since the currents needed are just a few uA.
But I'll try some of these and see what happens.

                                       Thanks again,

                                            Jim


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2001\06\01@105625 by Russell McMahon

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Does anyone have any ideas for high voltage transistors?  I need some with
a BVCEO of between 1200 and 3000 VDC.  I know this is quite an order, but
I don't see any way aorund it at this time.  If no transistors are
available, some
high voltage op amps are available from APEX, but at $550.00 per amp, and I
need two, that gets quite expensive.  Anyway, if anyone has any ideas, let
me
know.


What are you using them for?
What sort of power / current ratings do you need?


Here are some candidates:

BU226            SI-N 2000V 1.5A 10W   TO3
2SC1413A     SI-N 1200V 5A 50W
2SC3178       SI-N 1200V 2A 60W
2SC3642       SI-N 1200V 6A 100W 200ns
BUV48C        SI-N 1200/700V 15A 150W
BUX98C        SI-N 1200V     30A 250W 5MHz
MJW16206    SI-N 1200V     12A 150W 3MHz
2SC5045       SI-N 1600V      15A 75W
2SC5047       SI-N 1600V 25A 250W
2SC5048       SI-N 1500V   12A 50W 0.3us
2SC5244A     SI-N 1600V   30A 200W
2SC3026       SI-N 1700V      5A 50W POWER
2SC4532       SI-N 1700V 10A 200W 2uS
2SC4538       SI-N 900V  5A 80W
2SC5144       SI-N 1700V   20A 200W
2SC5150       SI-N 1700V 10A 50W 03us
2SD2253       SI-N+D 1700V 6A 50W
BDX32           SI-N 1700V   4A 40W
BU208D         SI-N+D 1500V 8A 150W
BU209            SI-N 1700V   4A 12.5W   TO3
BU2527AX    SI-N 1500V 12A 45W 0.2US
BU2722AF     SI-N 1700V   10A 45W
BUH515D       SI-N+D 1500/700V 8A 60W
BUH517          SI-N 1700V   8A 60W 3.9us
BUY71             SI-N 2200V 2A 40W HORDEFL


regards


           Russell McMahon

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2001\06\01@110610 by Roman Black

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James Paul wrote:
>
>  Thanks to all who replied to this request.  I appreciate the help.
>  These transistors are to be used in an electrostatic deflection
>  project.  Current handling and power handling capability are of
>  only minor importance since the currents needed are just a few uA.
>  But I'll try some of these and see what happens.
>
>                                         Thanks again,
>
>                                              Jim


Hi Jim, I am sure I won't be the only person
here interested in what you find out. Please fill
us in on any cool info you come across regarding this
project.:o)
-Roman

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2001\06\01@110614 by J.Feldhaar

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Hi Jim,

I don't know if you are aware of the concept of "stacking" transistors to get them
to operate at higher voltages, if fast switching speeds are not important.
This scheme is not universal, but for simple switching to gnd it is rather well
suited. Unfortunately I haven't used it in years, will have to look up the
schematic at home. I'll try my best to describe it here...
It works along the following lines: You have one transistor configured normally,
but the collector of this one (NPN example) is connected to the emitter of the one
above, and the base is connected to the other base via a resistor, and so on, you
get a vertical line of transistors, and the resistor ladder connected to the bases
will distribute the voltage in equal portions among the transistors. The current
through all of this is adjusted by the bottom transistor, you can even add some
feedback and so on. Just keep in mind that the resistor ladder has to have a value
suited to the application...and some HV transistors may have external metal parts,
then being at considerable voltage....also if one of the resistors develops a
fault, one of the transistors will be overloaded, then the next etc..

But perhaps this can help with some K-Volts.

My 0,02 Euro worth....

Greets
Jochen Feldhaar DH6FAZ

James Paul schrieb:

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2001\06\01@152723 by James Paul
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All,

In my request for HV Transistors, it appears as though I may not
have given enough information.   Some of you have suggested
transistors to be used in switch mode.  Actually, these will be
operated class 'A' as linear amplifiers.  Frequency response is
basically a don't care.  Frequencies involves are DC to about 2Khz
or so.  Same with current and power handling capability.  They
will be used in a static deflection application.  They will be
driven with a 0 to 5 volt analog level, and will output 0 to 2500
volts DC or so.   As soon as I can find some suitable transistors
and get a circuit designed to fill my specs, I'll share it with all
if I'm allowed.  This is for my work, so it my be considered
proprietary.   Anyway, I'll do what I can.  And thanks to all for
your suggestions so far.  If you find anything else, don't hesitate
to let me know.   I'll take all I can get.   And the more parts I
have to choose from, could allow more substitutions, therefore it
will be easier to duplicate.

                                         Thanks and Regards,

                                                Jim




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2001\06\01@155243 by Mark Newland

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If it wasn't work related, I would have suggested vacuum tubes.

James Paul wrote:

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2001\06\02@034603 by Chris Carr

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This configuration is called "Cascode". Unfortunately, I did a quick look
with a search engine and did not find much of use. So you will probably have
to revert to textbooks for more information.     8-(

Regards
Chris Carr

{Original Message removed}

2001\06\02@051419 by Roman Black

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Hi Jim, you should have no probs with the big TV h-out
transistors. These switch about 120w at 2kv+ p/p and
15kHz rate. Your requirements are much more gentle.
:o)
-Roman


James Paul wrote:
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2001\06\02@070340 by Peter L. Peres

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Since your speed requirements are lax, could you not use a DC/DC topology
at a much higher frequency using a transformer or choke and a high voltage
diode in a closed loop (which is much easier to come by) ?

Peter

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2001\06\02@071155 by Peter L. Peres

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Are you sure that a transformer cannot be used ?

Peter

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2001\06\02@104605 by Jim Paul

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Unfortunately no.  These frequencies are the range of the electrostatic
device, so therefore must be
used.  We have a DC-DC power brick that allows 0-12 volts DC in, and gives
out 0 2500 volts DC
that is proportional to the input.    These are about $150.00 or so each.
And the power bricks are
not designed to be fed a varying voltage at that rate.  They were designed
to be programmed to one
voltage and remain there.

If anyone is interested in the device I'm working with, go to http://www.i-o.com
and look for the "MEMS"
link.  Go to the "MEMS" pages and you'll see a "DuraScan" TM mirror link.
Click this and you'll see
what I'm working with.  There are also some white papers and other
discussion of this device there.

If anyone wants to use one of these in their application, or you know of
someone who does, have
them contact one of the persons listed and tell them I (Jim Paul) sent you.
I won't get anything for it,
but they'll at least know that I'm helping to promote it.   There is also
some information on the "MEMS
Accelerometer" there too.  Same here as far as applications are concerned.
Just call one of the
persons listed.

And since I've gone this far telling about my work, as an FYI, "Applied
MEMS" an Input-Output
Company, where I work, has one of the few "Bulk Micromachining Fabs" in the
world.  We have
had several customers visit the fab and all have said how impressed they
were with the facility
and how l;eading edge the technology is and how all of the equipment is
first rate and about the best
in the business.   So if anyone needs any bulk micromachining done, again
call one of the persons
listed there.   Especially Howard Goldberg, or Jeff Gannon.  and again, tell
them I sent you.

And if there are any more suggestions for HV Transistors, keep them coming.



Thanks and Regards,


Jim
{Original Message removed}

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