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Best 5V SMPS ?
Best 5V SMPS ?
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Old 29th December 2017, 04:09 PM   #61
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
Quote:
Originally Posted by soundcheck View Post
Once your're done with the finetuning and related measurements...
...don't forget to run listening tests!


While we're at it...

We already discussed that future Allo HATs should all have the same powering scheme (jacks and jumpers to disconnect power rails from lower and upper boards). Meaning. The user should be able to easily attach a single 5V supply to a complete tower or power a group of boards (e.g. Kali and DAC) or power each board separately.

Obviously the target behind it is primarily to achieve a little better performance and not boosting your product sales. (This would be a nice side-effect from your perspective though )

Enjoy.
Check new Boss v1.2..
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Old 1st January 2018, 11:49 AM   #62
basreflex is offline basreflex  Spain
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there are varous design choices related to the switching frequency vs the audio clock frequencies used in the system. one is to use a fixed dcdc frequency, like possible in the zvs resonant design, giving up some input range (although there are 3phasic options to combat that) and burn away some heat linearly to adapt to input voltage variations.
the fixed frequency can be set to lay either outside the audioband of interest, the harmonics will at some point conincide with clock harmonics. the next option is to sync the dcdc freq to a multiple of the audio word clock , for example 192kHz or 384khz .

the resonant designs have a considerably lower common mode noise due to weaker coupling between secondary and primary. and that is the noise that enters into the system, not the nosie across the terminal..
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Old 1st January 2018, 12:20 PM   #63
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
Quote:
Originally Posted by basreflex View Post
there are varous design choices related to the switching frequency vs the audio clock frequencies used in the system. one is to use a fixed dcdc frequency, like possible in the zvs resonant design, giving up some input range (although there are 3phasic options to combat that) and burn away some heat linearly to adapt to input voltage variations.
the fixed frequency can be set to lay either outside the audioband of interest, the harmonics will at some point conincide with clock harmonics. the next option is to sync the dcdc freq to a multiple of the audio word clock , for example 192kHz or 384khz .

the resonant designs have a considerably lower common mode noise due to weaker coupling between secondary and primary. and that is the noise that enters into the system, not the nosie across the terminal..
Precisely why we chose resonant when we started the design..
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Old 3rd January 2018, 12:34 PM   #64
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
New PCB design (final) has started. Noise/ripple are 140uV(switching noise and ripple included) above our oscilloscope (with differential amplifier ) noise floor (300uV) in the 0-100Khz

We are optimizing the PCB layout and will do test final product.
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Old 4th January 2018, 12:40 PM   #65
Josv is offline Josv  Netherlands
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Join Date: Nov 2017
Smile max voltage power for Kali Reclocker?

Hi cdsgames, I am the happy owner of a Kali Reclocker (with RPI2 and DAC) and want to give it the best food!
I have a 6 volt lead acid battery (agm), fresh loaded 6,4 volt.
With a buck converter from 6,4 to 5 volt it works, but it creates new noise
Can the Reclocker handle more than 5 volt?
What is the max?
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Old 5th January 2018, 05:06 PM   #66
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
Quote:
Originally Posted by Josv View Post
Hi cdsgames, I am the happy owner of a Kali Reclocker (with RPI2 and DAC) and want to give it the best food!
I have a 6 volt lead acid battery (agm), fresh loaded 6,4 volt.
With a buck converter from 6,4 to 5 volt it works, but it creates new noise
Can the Reclocker handle more than 5 volt?
What is the max?

5.5V max for Kali. Please keep this thread for SMPS 5v
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Old 9th January 2018, 11:11 AM   #67
cdsgames is offline cdsgames  Canada
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Latest reading on our test setup.

Using a spectrum analyzer, we measured 17uV RMS of ripple/noise 0-400Khz . (1w)
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Old 10th January 2018, 08:21 AM   #68
soundcheck is offline soundcheck  Germany
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Location: DUS
Wow. What a progress!

I do have the feeling that the PSU market gets shuffled soon.
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Old 17th January 2018, 01:31 AM   #69
SanjeevM is offline SanjeevM
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@cdsgames: These specs are phenomenally good!!

If you can also provide screw terminals for Vout, it will be possible for DIYers to mount the PS inside the cabinet and use shorter DC cables. (Though I wonder if there will be increased noise due to EM affecting the TPA3255 board!).

I am currently using a RPi with Allo Boss DAC HAT (older verseion) and a 7 in lcd. Power is fed thru the RPI to the DAC and by USB from the RPi to the Lcd using an IFI 5V adapter. The yellow power symbol keeps coming on indicating that the voltage to the RPi is low. Is it because the setup needs more current than 2.5A the IFI provides? Can you test your unit for this setup please.

Last edited by SanjeevM; 17th January 2018 at 01:36 AM.
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Old 17th January 2018, 12:23 PM   #70
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
Quote:
Originally Posted by SanjeevM View Post
@cdsgames: These specs are phenomenally good!!

If you can also provide screw terminals for Vout, it will be possible for DIYers to mount the PS inside the cabinet and use shorter DC cables. (Though I wonder if there will be increased noise due to EM affecting the TPA3255 board!).

I am currently using a RPi with Allo Boss DAC HAT (older verseion) and a 7 in lcd. Power is fed thru the RPI to the DAC and by USB from the RPi to the Lcd using an IFI 5V adapter. The yellow power symbol keeps coming on indicating that the voltage to the RPi is low. Is it because the setup needs more current than 2.5A the IFI provides? Can you test your unit for this setup please.
Your current is fine, but ifi PSUs will drop voltage to 4.8v as you approach 2.2A
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