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Old 26th July 2017, 12:39 PM   #1
Stammheim is offline Stammheim  Germany
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Join Date: Jul 2012
Default FS: „Ultra Low Noise“ Power Supply, LT3045 based PCB’s

Friends,

I’ve got some PCB’s left to built up an „Ultra Low Noise“ power supply, which I’d like to offer here.
It’s about LT3045 based PCB’s, so you can built up symmetrical (connected by a jumper) or separate power supplies, the PCB itself can be devided in the middle as shown on the pictures, so you’ll get two power supplies for different projects.
Up to 3x LT3045 can be used per side, which gives up to 1,5A per rail.
Output voltage is to be adjusted by using a potentiometer (up to 15V), I recommend to use a heatsing (up to 25x25mm per side).
I use the ps to power opamps in several devices and other designs, which are sensitive to power quality.

The PCB measures 50x68mm, 70um and is kept in beautiful white colour.
The Layout is used from the datasheet, you’ll also find all figures like noise etc there, please take a look to site 20 (parallel devices).
The BOM and the place plan will of course be published to all buyers. Because I did the PCB’s for myself, I don’t have a finished „HowTo“ yet.
If there's more interest, I could finish a small HowTo next days.

If somebody‘s interested, I have some LT3045 left, which can be bought for 5€ each.

International shipping should be about 3,70€ for small amounts, price per PCB is 12€

Contact me for any questions. If you’re intrested, please PM me.

Regards

Stammheim

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.


Highlights taken from datasheet:

· Ultralow RMS Noise: 0.8μVRMS (10Hz to 100kHz)
with one regulator, noise is getting lower using multiple regulators
· Parallelable for Lower Noise and Higher Current
· Ultralow Spot Noise: 2nV/√Hz at 10kHz
· Ultrahigh PSRR: 76dB at 1MHz
· Output Current per LT3045: 500mA
· Wide Input Voltage Range: 1.8V to 20V
· Output Voltage Range: 0V to 15V
· Low Dropout Voltage: 260mV

Last edited by Stammheim; 15th August 2017 at 05:09 PM.
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Old 15th August 2017, 05:02 PM   #2
Stammheim is offline Stammheim  Germany
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Join Date: Jul 2012
Another picture with the board delivering about 750mA:

Click the image to open in full size.
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Old 16th August 2017, 11:50 AM   #3
Theodosis O. is offline Theodosis O.  Greece
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Join Date: Feb 2006
Location: Athens
Hi Stammheim,

One pcb is for symmetrical output? Ie 2x15V

Thanks
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Old 16th August 2017, 02:44 PM   #4
Stammheim is offline Stammheim  Germany
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Join Date: Jul 2012
Hi Theodosis,

That's right. The schema above is placed twice, two separated rails, both adjustable independently

Regards

Stammheim
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Old 16th August 2017, 08:19 PM   #5
branadic is offline branadic
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Join Date: Feb 2016
Hi Stammheim,

wrote you an email, I'm in with one board. I had exactly the same idea a few weeks ago, but couldn't find the time to design the boards yet. The only difference I had in mind is to spend a second pot for the current limit function, as well as using Vishay precision pot:
Click the image to open in full size.

I have already 7 segment panel volt and current meter on my desk for that purpose:
An externally hosted image should be here but it is no longer accessible. Please upload images instead of linking to them to prevent this.


Now you have been fastern than me and I can save that time and spent it on another project.

-branadic-
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Old 22nd August 2017, 05:29 AM   #6
shattered_dream is offline shattered_dream  Germany
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Join Date: Dec 2009
Too bad I'm not able to solder SMD components
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Old 31st August 2017, 03:45 PM   #7
Theodosis O. is offline Theodosis O.  Greece
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Join Date: Feb 2006
Location: Athens
Where we can find the LT3045 ?

I can't find it in Mouser or TME.
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Old 31st August 2017, 10:12 PM   #8
Stammheim is offline Stammheim  Germany
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Join Date: Jul 2012
I found these great guys at Digikey, like all other parts needed for this board
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Old 7th October 2017, 05:33 PM   #9
Stammheim is offline Stammheim  Germany
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Join Date: Jul 2012
HowTo and BOM are finished, so it should be easy for everyone to understand!

Because I was asked to finish also boards for less experienced users, I also offered boards with fully published LT3045 (6 pcs per board) for 82€. That's a few bucks more, but soldering the little guys isn't easy, on the other side the function is checked, one only needs to populate other parts, 0805 and bigger.
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Old 12th October 2017, 12:23 AM   #10
kritpoon is offline kritpoon  Thailand
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Hi,
I am interested in the finished board. Could you please kindly PM me? Thank you.
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