Super Regulator, collecting the facts

[jackinnj]

Originally posted by peranders

Somewhere between 500-1000 mW. Since I have a groundplane I'll get cooling also. I haven't tested the absolute limit.

Mine dissipates about 800 mW -- the D-Pak is about 50% more efficient than the SO-223 package and is a pretty close analog to the D44 and D45 used by WJ and JD in their designs -- but in both cases the required surface area under the chip is pretty small -- at least according to National Semi AN-1028.

[lineup]

Originally posted by ALW
The AD797 is a remarkable chip,
but not in this reg.
---
Not one of my AD825-based units has ever oscillated

ALW
I agree with first part of yur statement - because it is for me TRUE!

jackinnj
great work and excellent investigations.

I also can tell, for anyone not knowing already, there is not many that have succh nice test-gears, (some of it he has built himself) as jackinnj.
Me lineup has not!
... but I many times can recoginze a good circuit, by the sight of it.
AD797 is such a circuit.
Anyone that has followed my works and postings here, would know about my likings of AD797.

Do a forum search: lineup AD797





In this special Super Regulator application
it looks like AD825 does well,
but both AD797 and LT1055 does better, by one level.



May I also remind of one Topic I started, where I published a discrete Clone of AD797.
Those who can understand what is a good Amplifier
has already downloaded my schematics

the AD797 chip, has got it's limitations:
mainly:
- Supply Voltage upper limit
- Ouput Drive Current limit, comes from how much heat a DIL8 can take
... while my Clone and any customly design AD797-Clone does not need to have
such restricted performance.
-------------------------------------------------------------------------


Keep on this Super Regulator work boys and girls!
( I see jackinnj is most probably a dear Lady )
and .... peranders is a very good man in Low Noise Extreme apps.
( See for example peranders Extreme Low Noise RIAA Amp )


Couldnt be a better Team here,
for making The Ultimate Best Regulator ... ever


Regards
lineup

.................................................. .................

APPENDIX A.
Amplifiers >Solid State > AD797 Clone people! Who can make a better one.

AD797 Clone people! Who can make a better one.

Originally posted by lineup
12th December 2006
Everything tells me, that AD797 is not only a very good operational amplifier
The topology used has got to be something extremely good!
----
A few details from me, for those who want to try to make a better AD797 Clone.
... but I am not sure anyone could do this better than myself
... maybe get some similar results, but not better, I doubt.
----
My circuit is in attachment and follows the AD797 schematic

[jackinnj]

Originally posted by lineup



Keep on this Super Regulator work boys and girls!
( I see jackinnj is most probably a dear Lady )

No, it's just that Carol Beer is my favorite actrix.

[lineup]

Originally posted by jackinnj

No, it's just that Carol Beer is my favorite actrix.

There has been 'a pair of boys' on our TV up here.
It is two crazy english boys, and they dresses in Womans clothes.
Often also one of them is sitting in a wheel chair.

I wonder, maybe 'Carol' is in that English TV-serie?
Anyway, it is almost as fun & good as 'Monty Python's Flying Circus'
... another totally absurd English invention.

Regards
lineup - not english, - but I fancy them Crazy English
like: John Cleese - my good what Childish Man ;D

[peranders]

lineup, can't you stick to the topic please? Do you have anything technical to add?

[peranders]

Originally posted by peranders
A tube based sort of super regulator, an article by Mr. Bob Pease.

http://www.elecdesign.com/Articles/I...ArticleID=1509

I think it look like an super regulator if the basic concept is considered as an voltage reference powered from the output and an error amp also powered from the output.

What do you say guys, tube dudes? Can this circuit be labeled as "super regulator"?

[aparatusonitus]

Here is my implementation of W. Jung Regulator in Eagle3d image. Real thing works without any sort of problem even with AD797 opamp.

http://img.photobucket.com/albums/v5...usonitus/W.jpg

[gootee]

If anyone already has any scope photos (or just data) of transient testing with a dynamic load, such as when drawing fast-edged current steps that rise from near minimum to near maximum and fall from near maximum to near minimum, or whatever else you might have, perhaps something that might be a more-appropriate transient test, I would be interested in seeing them.

[AndrewT]

Hi Aparatus,
give us more, I'm banging the spoon.

[aparatusonitus]

Originally posted by gootee
If anyone already has any scope photos (or just data) of transient testing with a dynamic load, such as when drawing fast-edged current steps that rise from near minimum to near maximum and fall from near maximum to near minimum, or whatever else you might have, perhaps something that might be a more-appropriate transient test, I would be interested in seeing them.

I don't have scope, but I do have a friend owning one, so if you explane me step by step how and what I need beside scope, maybe I can performe same testing in future (emphasize on maybe and future), cos I've never deal with scope and stuff beffore.

Originally posted by AndrewT
Hi Aparatus,
give us more, I'm banging the spoon.

Will do I hope, but what exatly you want Andrew?

...and my apologize to Mr. Walt Jung 'cos I put his name on thing which he has no involvement in. Anyway, I will remove his name if I ever produce some more PCBs, 'cos I have deep respect for him (thx Per-Anders )