Super Regulator

Mark Johnson

Member
Paid Member
2011-05-27 3:27 pm
Silicon Valley
Octopart.com says there are plenty of parts for sale at Texas Instruments' web store. Image #1 below.

I logged in to my account at the TI store to double check. TI agrees with octopart: plenty of parts on the shelf. Image #2 below.

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I'm thinking of using the regulator on the DAC as well.
I designed them a few years ago, and using the LT3042 for the analog 5v.
Would using the cascade Jung Regulator (jung->LT3042) be redundant? useless? :unsure:
Should I eliminate the LT3042 and put the jung regulator directly on rail 5v?
What is more convenient?
 
Hello, is me again and i hit 2 roadblocks. I cannot figure out the Z6.8 D1/D7, if its 6.8V Zener then im stupid and excuse me. Second problem is that i wont be able to get LM329's but found the PM829 which uses 2 1N5234B diodes back to back as a replacement. I'm asking if any modification have to made to the board to house the replacement. Thx in advance.
(Figured out that the sense wires go with the power wires)
 
If you look at the schematic you'll see the zener symbol. chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://linearaudio.nl/sites/linearaudio.net/files/superreg%20article%20V2.3.pdf
D7/D8 are totally uncritical, they are there to place the opamp output 'about' in the middle of the supply range. For +/-15V that's about 7V.
You can use anything from 4.7V to 8.2V.
PM826's can be used for the references, yes. Walt shows how to wire them in series.
chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://refsnregs.waltjung.org/The_PM829_Reference.pdf
When you are going to buy 6.2V zeners, you can also use them for D7/D8 so you only need to get one value.

Jan
 
Thanks for answering Jan, but i'm back with one more question if you don't mind. How much problem would a 2 stage LC and an EMI filter would cause in front of the super reg?
 

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Mark Johnson

Member
Paid Member
2011-05-27 3:27 pm
Silicon Valley
If and when I include a series inductor in a DC supply, I try to find out that particular inductor's "self resonant frequency" . Either by looking it up on the datasheet, or by attempting to measure it on the bench. Then I attempt to devise damping circuitry that will lower the resonant "Q" below 0.5, so the inductor won't oscillate/ring at its self resonant frequency.

Perhaps this is needless paranoia, but the cost is usually very small, while the benefit (peace of mind) is, for me anyway, quite large.

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