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Old 29th May 2019, 10:47 AM   #1661
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by Abartels1965 View Post
Thanks Jan for answering this quick!

Is there any preferred opamp which is capable of +/-36V?

I tried to read all the 160+ pages, but it's a lot to read.

What kind of zener do you prefer for 60V regulated output?


Many thanks and cheers! (hmm, it's a bit early for a Bernardus Abt )

Alex
I'm not familair with high voltage opamps, but the OPA454 and ADA4700 come to mind. Not sure they fit the PCB footprint.

If you mean the zener on the opamp output, should be half total supply, but not critical. Only necessary to keep the opamp output away from ground and supply, so for 60V anything between 20 and 40V would work..

Jan
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Old 29th May 2019, 11:02 AM   #1662
Abartels1965 is offline Abartels1965  Netherlands
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Thanks Jan, looking at datasheets of those opamps, they have rather high noise rates.


What are, in your opinion, the most important characteristics to look for in a suitable opamp in this design?
I haven't a clue what to look for, bandwidth, slew-rate, Noise, Unity gain, cmrr, etc?

Sorry for asking these questions, but I really haven't a clue
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Old 29th May 2019, 11:02 AM   #1663
EUVL is offline EUVL  Europe
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ADHV4702-1 Datasheet and Product Info | Analog Devices


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Old 29th May 2019, 11:04 AM   #1664
Abartels1965 is offline Abartels1965  Netherlands
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Hi Patrick, I noticed that one too, specs seems great to me, but again, I haven't a clue if they are good for this design. If I am not mistaken, Jan did not like this one for regulator design
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Old 29th May 2019, 11:57 AM   #1665
jan.didden is offline jan.didden  Europe
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Trust Patrick to find some exotics! ;-)
Spec-wise this looks good, the problem with this one is that it is hardly diy-solderable.
The ADA4700 is solderable, as is the OPA545. In this app the back plane soldering can be omitted, just put some thermal grease.

Slew rate is not that important, the output barely moves. Low noise is nice, wide bandwidth is nice. Ohh and unity-gain stable preferably...

Jan
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Last edited by jan.didden; 29th May 2019 at 12:02 PM.
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Old 29th May 2019, 12:03 PM   #1666
Abartels1965 is offline Abartels1965  Netherlands
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Ok, thanks a lot Jan, and Patrick too

I soldered NDK NZ2520SD XO's by hand, they measure 2.5x2.0mm only, these ADHV4702 measure 7x7mm, they are big, hahaha

Maybe I will try them, or get some soldered to brown-dog adapter or other.

Cheers!

I will try LTC6090-5 first, 24m bandwith, 14n noise, little bit easier to solder
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Last edited by Abartels1965; 29th May 2019 at 12:15 PM.
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Old 29th May 2019, 12:20 PM   #1667
Abartels1965 is offline Abartels1965  Netherlands
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"The LTC6090 is unity gain stable. The LTC6090-5 is stable in noise gain configurations of 5 or greater"

Can I use the -5 version or not? If not I definitely will go for ADHV4702
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Old 29th May 2019, 01:44 PM   #1668
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by Abartels1965 View Post
"The LTC6090 is unity gain stable. The LTC6090-5 is stable in noise gain configurations of 5 or greater"

Can I use the -5 version or not? If not I definitely will go for ADHV4702
It's hard to say, there's a lot of gain in that loop, and for sure don't use the -5. You probably can compensate externally but without some pretty good scope and knowing what you do its hard. This is also for me uncharted terrain.

Personally I would give the 6090 a try.

Jan
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Old 30th May 2019, 12:46 PM   #1669
jackinnj is offline jackinnj  United States
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Super Regulator
On the BOM, the voltage divider resistors are specified as 1K, 0.25W metal film. Higher dissipation, better temco resistors are better (if you can fit them!).
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Old 30th May 2019, 01:11 PM   #1670
jan.didden is offline jan.didden  Europe
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Especially with 60V, you need to recalculate the divider ratio of course, and there's much more voltage across the top R. P = E^2/R ;-)

Jan
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