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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 18th January 2013, 04:06 PM   #3741
LouderIsBetter is offline LouderIsBetter  United States
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Is it possible to run the SSHV2 at lowish voltage and highish current. Such as 100v and 200mA output?
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Old 18th January 2013, 04:28 PM   #3742
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
100V yes, 200mA no. The particular Supertex parts won't provide.
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Old 18th January 2013, 05:16 PM   #3743
LouderIsBetter is offline LouderIsBetter  United States
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What is the highest current it can provide at 100v?
Thanks for your reply!

Mark
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Old 18th January 2013, 05:33 PM   #3744
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Near lower depletion Mosfet CCS part's IDSS. It varies per unit. Maybe 100mA plus. To surely go 100V you would need 27K resistors instead of 68K in SSHV2. SSHV1 has much more capability in CCS current by using a single enhancement mode part.
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Old 18th January 2013, 09:36 PM   #3745
quanghao is offline quanghao  Viet Nam
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[QUOTE=lordvader;
The next plan is to leave it running for a while, then readjust. How long will be ideal before I can deem everything stable?

Sent from my GT-P3110 using Tapatalk HD[/QUOTE]

I know,

You run for about 3 minutes, the output voltage will stabilize
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Old 18th January 2013, 09:40 PM   #3746
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by LouderIsBetter View Post
Is it possible to run the SSHV2 at lowish voltage and highish current. Such as 100v and 200mA output?
i think SSHV V1 can run 200mA at 100V

V in = 120VDC
So you can set R current all = 230 to 250mA . ( R1 ~ 7-10R )
And you need 200mA, can try to make it!
thanks
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Old 19th January 2013, 07:43 PM   #3747
merlin el mago is offline merlin el mago
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Salas I want to use only the CCS part of your regulator, could you tell how many volts draws?
Attached Images
File Type: jpg SSHV2 CCS 001.jpg (66.4 KB, 235 views)
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Old 19th January 2013, 08:55 PM   #3748
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
If you mean how many volts it drops across the cascode, then its about 7 plus whatever mA you set times (R4+R5).
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Old 19th January 2013, 09:14 PM   #3749
merlin el mago is offline merlin el mago
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With DCin 176VDC & 32,5mA for two #26 tube preamp, tx is 125VDC 100VA , I ask because I haven't enough space to fit a big heatsink for SSHV2, wich will be the minimum heatsink required if I use all SSHV2,because my box is only 40mm high?

Last edited by merlin el mago; 19th January 2013 at 09:19 PM.
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Old 19th January 2013, 09:19 PM   #3750
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
The sinked CCS Mosfet will burn about 1.5W in that case (with ~30mA setting). So a small one like we use for not too hot LM317 situations will do the job.
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