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Low noise 15 volt 3 amp SMPS
Low noise 15 volt 3 amp SMPS
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Old 12th January 2019, 04:37 PM   #1
dotneck335 is offline dotneck335  United States
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Default Low noise 15 volt 3 amp SMPS

I'm looking for a SMPS, 15 volt, 3 amp for use with a TDA7472MV Class-D amplifier. I found a Meanwell NES-50-15, but man is it ever NOISY!! 150 mv p-p quoted in datasheet; that's way too much. Is there something else available that is QUIET???
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Old 12th January 2019, 04:59 PM   #2
Koifarm is offline Koifarm  Netherlands
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Better specs.50mv.

75W 15V 5A Waterproof outdoor Single Output Switching power supply SMPS AC TO DC | eBay

But you would not hear it because rimple is at 40khz and only at full power.
Normally with 1 watt output the rimple is 1 to 5mv.
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Old 12th January 2019, 08:36 PM   #3
dotneck335 is offline dotneck335  United States
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Better specs.50mv.
Thanks!! Looks like it'll do......
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Old 12th January 2019, 09:56 PM   #4
Koifarm is offline Koifarm  Netherlands
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Be ware off that the ebay smps is 230v ac input and not 115v ac.
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Old 13th January 2019, 01:25 AM   #5
dotneck335 is offline dotneck335  United States
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Originally Posted by Koifarm View Post
Be ware off that the ebay smps is 230v ac input and not 115v ac.
Thanks for pointing that out. He does have other supplies that work on 115 vac but, again, 150mv p-p ripple & noise. That's just too much! On my linear supplies, I can usually expect less than 10mv p-p. Can't SMPS supplies do anywhere close to that?
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Old 13th January 2019, 02:19 AM   #6
mpmarino is offline mpmarino  United States
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I'm partial to the flatPacs. A step up from everything IMHO.

Vicor FlatPAC VI-LU2-EV ~ 150W 10A 15V Power Supply FS | eBay
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Old 13th January 2019, 02:51 AM   #7
dotneck335 is offline dotneck335  United States
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Originally Posted by mpmarino View Post
I'm partial to the flatPacs. A step up from everything IMHO.
Hmmmm....looked up their specs---they are quoting ~ 112 mv ripple 0n a 15 volt supply....still not all that good......
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Old 13th January 2019, 05:20 AM   #8
mpmarino is offline mpmarino  United States
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Great, that leaves more for me

Are you considering the frequency of the ripple, and the SMPSs ability to withstand additional filtering? - will it not start with additional capacitance?

Why not go for something made in Andover MA that is subject to real scrutiny than something that, well, hmm ?
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Last edited by mpmarino; 13th January 2019 at 05:22 AM.
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Old 15th January 2019, 06:30 PM   #9
dotneck335 is offline dotneck335  United States
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Originally Posted by mpmarino View Post
Are you considering the frequency of the ripple, and the SMPSs ability to withstand additional filtering? - will it not start with additional capacitance? Why not go for something made in Andover MA that is subject to real scrutiny than something that, well, hmm ?
What sort of additional filtering would you suggest, for, say an SMPS that switches at ~75 KHz? I was thinking of a 200H coil in series, with a 0.022F cap to ground.
What is "something made in Andover MA"?
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Old 16th January 2019, 12:30 AM   #10
mpmarino is offline mpmarino  United States
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Originally Posted by dotneck335 View Post
What sort of additional filtering would you suggest, for, say an SMPS that switches at ~75 KHz? I was thinking of a 200H coil in series, with a 0.022F cap to ground.
What is "something made in Andover MA"?
Honestly, I'm not sure what would work best in a specific application. I've tried some things but my efforts were wasted. From memory the ripple with the vicors was above 200KHz so i didn't kill myself trying. Vicor doesn't spec a specific switching freq if I recall. I believe they start 100Khz at light load and on up to 2Mhz at full load. - please check that, it is from memory.


I'm running a threshold NS10 pre clone and associated phono pre on a 24v vicor Flatpac. There is 32,000 uF capacitance on the DC side. Starts and runs fine with the 32 there. I have no idea if the capacitance helps, but unless i'm deaf - there isn't a peep of noise. Dead silent.

I have a Pass class A M2 clone amplifier with 2x24v vicors in series (this is sacrilege) in a separate enclosure from the amp. ~10,000uf per rail on the DC side. This is the quietest amp I have ever had on my 98dB Forte' II.

I have a Pass Aleph 5 clone with 4 x vicor flatpacs. Too much hiss. I think my board layout is oscillating - or hey, maybe it's the PSUs? Don't have the time to get into it and it's too cold in the shop.

Something made in Andover MA is Vicor

I really like these things, is all.
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