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Old 4th February 2017, 08:05 AM   #1
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Default Best 5V SMPS ?

Unfortunately there is no other than the Amplifier-Power Supply section at DIY-A.

I give it try over here with this topic.

***

I'm looking for a very good (DIY-) 5V SMPS ( and/or tweaks) out there. Yep - no linear supply!!!

Applications are endless for these.

RPI, HAT devices, routers, PC peripherals, you name it.

Right now I'm quite happy with the iFi iPower.
With 2.5A it also delivery plenty of power.

iFi claims 1uV noise. Which obviously can be considered quite a low value.
However. iFi excludes mains and switching related noise. Hmmh.
And they limit it to the audio band. Hmmmmh
I'd be interested to see what's left of that 1uV - if you take the exclusions out.

Anyhow. I still think and know from experience that the device performs really well.

I tried to put a Meanwell RS15-5 (@5.5V) + TPS7A4700 up against the iPower.
That combo didn't perform on the same level.

Any ideas for approaching the subject are welcome.
Maybe also ideas of how to get e.g. the Meanwell noise (80mV) down would be good starting point.


Cheers


BTW: I added some mods to the iPower. I shortened the cable down to around 12 inches and I also added a large buffer cap at the end of the cable.

Last edited by soundcheck; 4th February 2017 at 10:10 AM.
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Old 4th February 2017, 08:57 AM   #2
peufeu is offline peufeu  France
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For stuff like a Pi or a router, power supply noise is irrelevant. If it has 5V input, internally it must run on 3V3 and other lower voltages, which means it has internal regulators, most likely switching.

What is relevant:

- If target device is connected to an audio system through cables, then common mode current generated by the power supply will flow into those cables and contaminate grounds. This really is the most important spec. It is really hard to get rid of common mode currents. Power supply design needs to take this into account right from the start.

- Radiated electromagnetic fields

- Amount of noise injected into the mains (and picked up by nearby equipment).

- Fire & electrocution hazard with "too cheap to be true" phone chargers...
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Old 4th February 2017, 10:17 AM   #3
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Power supply noise is never irrelevant in the context of high quality audio power networks!!
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Old 4th February 2017, 10:23 AM   #4
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Quote:
Originally Posted by soundcheck View Post
Power supply noise is never irrelevant in the context of high quality audio power networks!!
can you backup your general claim by some relevant content?
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Old 4th February 2017, 10:29 AM   #5
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R u kidding me?
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Old 4th February 2017, 10:51 AM   #6
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Just for reference and information. Archimago made some measurements with rpi3 using a couple of different PSUs.
Archimago's Musings: MEASUREMENTS: Raspberry Pi 3 as USB Audio Streamer (with recommended CRAAP config & TIDAL/MQA arrives)

But - good quality psu are never wrong.

Best regards.
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Old 4th February 2017, 11:20 AM   #7
peufeu is offline peufeu  France
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Quote:
Originally Posted by soundcheck View Post
R u kidding me?
Well, unless there is a big design mistake like :

- using the Pi as the DAC master clock
- using the same power supply both for the Pi and the DAC without appropriate care

Then yeah, it's pretty much irrelevant. Besides, if you measure the Pi's supplies while it works, or even the output of your "low noise" supply with the Pi connected and powered, I'm pretty sure you'd find the usual huge amount of noise associated with digital supplies. Go on, grab your scope probes and post a screenshot, it takes very little time...

> But - good quality psu are never wrong.

Sure!
Just don't believe that because it has "1V noise" written on it, there won't be 100000 times more noise once you connect a load which draws wildly varying current...
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Old 4th February 2017, 02:06 PM   #8
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Quote:
Originally Posted by peufeu View Post
Just don't believe that because it has "1V noise" written on it, there won't be 100000 times more noise once you connect a load which draws wildly varying current...
It all adds up doesn't it ?
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