High power CCS

db! · 13th December 2011, 06:34 PM

I'm looking to start playing with some power tubes that require relatively high B+(700+ volts) and high currents(150+mA). I would also like to stick with a solid state design to keep the design simple.

Would any of the following designs work ?

- A typical transistor & LED/Zener reference CCS. The transistor will obviously be sized according to the voltage and dissipation.

- A whole bunch of IXYS 10M90 in parallel to deliver the required current.

Any input would be appreciated!

Alastair E · 13th December 2011, 06:53 PM

How about a simple MOSFET CCS as plate-load, a mosfet Mu -follower...?

No need for complication, ref the gate to say, half +B coupled to gate by around 4.7M and you're done....

Just make sure the MOSFET chosen has a relatively low reverse-transfer capacitance, and use a Gate-Stopper of around 400-200 ohm in Carbon Compo, and keep the Gate connections to gate-stopper and protection zener good and short...

--Seeing you're running a fairly high current, a Plate-load resistor of only a few hundred ohms is needed--Figure dropping around 15-20V across it....

Ive had good results with this idea.....

SemperFi · 08:39 PM

I assume this is a PP output stage and the ccs goes in the cathode end. ? Then I'd go for your first suggestion.
What is the voltage available for the ccs? What tube is it?

I think u need to elaborate a little more about what u're making.

tomchr · 13th December 2011, 09:06 PM

IXYS 10M45 with a cascode (assuming you have the headroom) would work as well.

I see no reason a normal LED-based CCS wouldn't work as long as the devices don't see over-voltage, over-current, or SOA overload conditions. I'd probably run some sims to ensure that none of these silicon killers are present during start-up as well as normal operation. Or at least think it through...

~Tom

db! · 13th December 2011, 09:08 PM

The plan is for a CCS-loaded parafeed; B+ is around 750v or more, currents are around 150-200ma.
I am still experimenting at this stage so there isn't a formal plan. I'd at least like to get these firebottles glowing.
The tubes in question is eimac 100th and 4E27.

DF96 · 13th December 2011, 09:39 PM

Could you use a pentode as CCS?

db! · 13th December 2011, 10:25 PM

Quote:

Originally Posted by DF96

Could you use a pentode as CCS?

Unless there is no reasonable way to do this with solid state parts, I'd like to avoid tube/hybrid CCS.

Bas Horneman · 10:36 PM

How about IXYS IXTH 20N50D? Perhaps with the IXYS IXTP01N100D on top? (several parallel (not sure if that is possible) (1000V)

piano3 · 10:39 PM

Quote:

Originally Posted by DF96

Could you use a pentode as CCS?

Hello DF, can you think of any with both suitable gain and current capability of 150mA?

DF96 · 13th December 2011, 10:40 PM

Well, maybe a transmitter tetrode? These go up to very big sizes.

13th December 2011, 06:34 PM	#1
db! diyAudio Member Join Date: Nov 2009 Location: Ontario	High power CCS I'm looking to start playing with some power tubes that require relatively high B+(700+ volts) and high currents(150+mA). I would also like to stick with a solid state design to keep the design simple. Would any of the following designs work ? - A typical transistor & LED/Zener reference CCS. The transistor will obviously be sized according to the voltage and dissipation. - A whole bunch of IXYS 10M90 in parallel to deliver the required current. Any input would be appreciated!

13th December 2011, 06:53 PM	#2
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	How about a simple MOSFET CCS as plate-load, a mosfet Mu -follower...? No need for complication, ref the gate to say, half +B coupled to gate by around 4.7M and you're done.... Just make sure the MOSFET chosen has a relatively low reverse-transfer capacitance, and use a Gate-Stopper of around 400-200 ohm in Carbon Compo, and keep the Gate connections to gate-stopper and protection zener good and short... --Seeing you're running a fairly high current, a Plate-load resistor of only a few hundred ohms is needed--Figure dropping around 15-20V across it.... Ive had good results with this idea..... __________________ Das Beste Oder Nichts

13th December 2011, 08:36 PM	#3
SemperFi diyAudio Member Join Date: Jan 2002 Location: nowhere	I assume this is a PP output stage and the ccs goes in the cathode end. ? Then I'd go for your first suggestion. What is the voltage available for the ccs? What tube is it? I think u need to elaborate a little more about what u're making. Last edited by SemperFi; 13th December 2011 at 08:39 PM.

13th December 2011, 09:06 PM	#4
tomchr diyAudio Member Join Date: Feb 2009 Location: Greater Seattle Area	IXYS 10M45 with a cascode (assuming you have the headroom) would work as well. I see no reason a normal LED-based CCS wouldn't work as long as the devices don't see over-voltage, over-current, or SOA overload conditions. I'd probably run some sims to ensure that none of these silicon killers are present during start-up as well as normal operation. Or at least think it through... ~Tom __________________ "50 % of the game is mental and the other 50 % is being mental. I've got that part down, no problem." http://www.neurochrome.com/audio

13th December 2011, 10:28 PM	#8
Bas Horneman diyAudio Moderator Emeritus Join Date: Apr 2002 Location: The Netherlands Blog Entries: 18	How about IXYS IXTH 20N50D? Perhaps with the IXYS IXTP01N100D on top? (several parallel (not sure if that is possible) (1000V) __________________ Boatanchor amps forum My "adventures" in audio Last edited by Bas Horneman; 13th December 2011 at 10:36 PM.

13th December 2011, 09:08 PM	#5
db! diyAudio Member Join Date: Nov 2009 Location: Ontario	The plan is for a CCS-loaded parafeed; B+ is around 750v or more, currents are around 150-200ma. I am still experimenting at this stage so there isn't a formal plan. I'd at least like to get these firebottles glowing. The tubes in question is eimac 100th and 4E27.

13th December 2011, 09:39 PM	#6
DF96 diyAudio Member Join Date: May 2007	Could you use a pentode as CCS?

13th December 2011, 10:40 PM	#10
DF96 diyAudio Member Join Date: May 2007	Well, maybe a transmitter tetrode? These go up to very big sizes.

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