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OLDO - Open source power supply modules
OLDO - Open source power supply modules
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Old 26th May 2017, 10:52 AM   #1
mravlca is offline mravlca  Slovenia
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Default OLDO - Open source power supply modules

Introduction
I want to present you my latest idea, open source power supply modules called OLDO. The name stands for Open LDO = OLDO. The whole project is around small PCB modules which contain various LDOs. Now we all like to experiment how power supply effects the end result, that is sound. And a lot of times there is quite big hassle to change PSU, especially when we already have everything mounted into the enclosure. So why not just change the core, regulator, and not the whole power supply? In the matter of minutes you'll be able to hear new regulator in action. These interchangeable PCBs are called Module A and their size is 20x26mm. Currently I made two versions of it one with TPS7A4700 and one with two LT3045 regulators in parallel. Both modules are capable of 1A current. They contain the basic parts for regulators to work properly. Connectors are standard 2.54mm pin headers and their alignment is arranged so they can be mounted on standard prototype PCB. Modules accept DC voltage input. Now any user can make his own AC/DC conversion or just DC input, and post filtering of the regulator. One with some experience in PCB design can even make support PCB to his own needs.
Till today I developed two Modules A and one support PCB called motherboard RMP (ready made power). Specs and options are listed under each device.

Module A

TPS7A4700 Module A
Size: 20 x 26 [mm]
Vin: DC max 25V, limited by rating of components
Vout: DC 1.4V -> 21V(max), limited by LDO
Iout: max 1A
Noise: 4uV
Sensing: Yes
Datasheet TPS7A4700 LDO

LT3045 parallel Module A
Size: 20 x 26 [mm]
Vin: DC max 20V, limited by LDO
Vout: DC 0V -> 15V(max), limited by LDO
Iout: max 1A
Noise: 0.8uV, theoretically even lower due to paralleled LDOs
Sensing: No
Datasheet LT3045 LDO

Motherboards

Ready made power - RMP
Size: 93 x 38 [mm]
AC or DC voltage input (separate inputs)
CLC input filter
LC output filter
Supports sensing
Option for THT and SMT diodes
Option for screw and spring load connectors

Github repository
OLDO - Open LDO
All new files will be now posted on the GitHub
Attached Images
File Type: jpg TPS_and_LT.jpg (865.2 KB, 1535 views)
File Type: jpg RMP_top.jpg (856.2 KB, 1455 views)
File Type: jpg RMP_bottom.jpg (933.8 KB, 1420 views)
File Type: jpg IMG_20170505_164509.jpg (393.2 KB, 1370 views)
File Type: jpg IMG_20170505_164536.jpg (900.1 KB, 1364 views)
File Type: jpg IMG_20170525_160316.jpg (917.9 KB, 553 views)
Attached Files
File Type: zip TPS7A4700 module A.zip (77.7 KB, 63 views)
File Type: zip LT3045 1A module A.zip (85.2 KB, 108 views)
File Type: zip Motherboard RMP.zip (122.7 KB, 68 views)
File Type: zip Module size A lbr.zip (7.7 KB, 39 views)

Last edited by mravlca; 30th June 2017 at 06:20 AM. Reason: Added Github link
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Old 26th May 2017, 10:59 AM   #2
mravlca is offline mravlca  Slovenia
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Default Heat sink

These modules are small and one might think how it will be able to handle current of 1A. I came to the solution which makes heat sinking of these modules quite simple. Instead of being placed at the top of the support PCB it must be placed at the bottom of it. The thermal bridge between module PCB and larger cooling surface is established with thermal pad.
The height from bottom side of the motherboard to the bottom of the module is just a bit under 11mm. I used 12mm standoffs and 1.5mm thick thermal pad, providing just enough pressure for good thermal contact.
Attached Images
File Type: jpg oldo_heat_detail (1).jpg (915.9 KB, 564 views)
File Type: jpg oldo_heat_detail (3).jpg (911.3 KB, 354 views)
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Old 1st June 2017, 02:40 PM   #3
drgnanam is offline drgnanam  India
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many thanks for the files
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Old 8th June 2017, 02:12 AM   #4
Philipp23 is offline Philipp23  Germany
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Hello Aleš
Really great idea. Are you going to sell these modules like your other power supplies?
What about a module A with some of the Analog Devices ADM715x regulators?
Kind Regards
Phil
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Old 9th June 2017, 03:40 PM   #5
mravlca is offline mravlca  Slovenia
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@drgnanam Sure, no problem. That is the whole point of open source.

@Philipp23 Yes, these modules are for sale though I am not advertising them yet... Thank you for reminding me about ADM715X devices, I will make this PCB also.

Regards,
Aleš
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Old 10th June 2017, 11:04 AM   #6
mravlca is offline mravlca  Slovenia
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In the first post there is now GitHub link where all new files, projects will be added. There is now also new Mini module A single LT3045.
Attached Images
File Type: jpg LT3045.JPG (317.2 KB, 352 views)
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Old 28th June 2017, 05:21 AM   #7
themystical is offline themystical  United Kingdom
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That is a really neat design idea. Thanks for being generous.
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Old 28th June 2017, 04:59 PM   #8
themystical is offline themystical  United Kingdom
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I wonder if somebody could advise what is the best way of outputting 1.2V say 400mA from the LT3045 module? Is there a neater way than adding a second in series LDO? Preferably one would want to retain the low noise output of the LT3045? The new ESS dac chips require 1.2V.


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Old 28th June 2017, 07:39 PM   #9
Nico Ras is offline Nico Ras  South Africa
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If I understand the PCB then the 4th and 5th PCB has voltage selection thus 0.8 + 0.4 should give you 1.2VDC. Is my assumption correct
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Kindest regards
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Old 28th June 2017, 07:51 PM   #10
themystical is offline themystical  United Kingdom
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Quote:
Originally Posted by Nico Ras View Post
If I understand the PCB then the 4th and 5th PCB has voltage selection thus 0.8 + 0.4 should give you 1.2VDC. Is my assumption correct


Do you mean the TPSA47 pcb? The minimum voltage for that regulator is 1.4V according to the datasheet?


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