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LT3080 High Voltage Floating Regulator
LT3080 High Voltage Floating Regulator
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Old 3rd May 2016, 10:02 PM   #1
jackinnj is offline jackinnj  United States
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LT3080 High Voltage Floating Regulator
Default LT3080 High Voltage Floating Regulator

In the Power Supply Section of the new edition of "Art of Electronics" a simple HV regulator using Linear Tech's LT3080. This seems to work nicely:
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File Type: png LT3080 Stepped Output.png (9.0 KB, 1479 views)
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Old 8th May 2016, 11:05 AM   #2
panos29 is offline panos29  Greece
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What if we raise the bar a bit and make it more useable by getting rid of the CCS and instead use resistors and a cascade of mosfets to raise useable current to lets say 200mA and share the HV drop to 2 mosfets? In the simulation seems to be able to handle shorts but c3 puzzles me a bit in case of direct short circuit.
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Old 10th May 2016, 05:51 PM   #3
jackinnj is offline jackinnj  United States
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LT3080 High Voltage Floating Regulator
I am having difficulty getting #1 to work, before moving onto #2.
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Old 10th May 2016, 05:54 PM   #4
panos29 is offline panos29  Greece
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what is the problem you are facing with #1 ?
I see a little mistake in your schematic though.the anode of D1 should be connected directly to source of M1 and not after R2. Also R4 should be bypassed wth 47-100uf.

Last edited by panos29; 10th May 2016 at 05:58 PM.
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Old 11th May 2016, 08:53 PM   #5
jackinnj is offline jackinnj  United States
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LT3080 High Voltage Floating Regulator
I've been away in Spain for a few days visiting a supplier, so haven't had much time to investigate.

D1 shouldn't make a difference, and that's how it's shown in Figure 9.113 of the new AofE.

The cap on Iset's resistor isn't necessary at this point, but is discussed over a few paragraphs in the datasheet.
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Old 16th May 2016, 05:50 PM   #6
jackinnj is offline jackinnj  United States
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LT3080 High Voltage Floating Regulator
My apologies to Tom in Calgary, this topic has been well rehearsed: http://www.diyaudio.com/forums/tubes...regulator.html
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Old 6th June 2017, 08:37 PM   #7
DualTriode is offline DualTriode  United States
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Default LT3080 version of series regulator

Hello jacjinnj,

Tom in Calgary has gone to the dark side and his series regulator in now commercial. No longer DIY supported.

Looking at your first post in this thread the STP8NM60 in the CCS is obsolete. (Is there a substitute?)

Are you using or building this LT3080 version of series regulator? If so with what results?

Thanks DT

Last edited by DualTriode; 6th June 2017 at 08:38 PM. Reason: LT3080 added
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Old 7th June 2017, 01:52 AM   #8
jackinnj is offline jackinnj  United States
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LT3080 High Voltage Floating Regulator
Quote:
Originally Posted by DualTriode View Post
Tom in Calgary has gone to the dark side and his series regulator in now commercial. No longer DIY supported.
Bare board is $50. The secret sauce is illustrated above and on his posts.
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Old 7th June 2017, 08:02 PM   #9
Ketje is offline Ketje  Belgium
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Quote:
Originally Posted by jackinnj View Post
I am having difficulty getting #1 to work, before moving onto #2.
Try it like this
Mona
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Old 13th June 2017, 10:59 PM   #10
DualTriode is offline DualTriode  United States
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Quote:
Originally Posted by Ketje View Post
Try it like this
Mona
Mona,

I have had the chance to read the power supply section in the new “Art of Electronics”. In your post you show going back to the original IRF840, added a gate stopper to the LND150 and rearranged the location of D1.

Will you share your process for moving D1?

Thanks
DT
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