PI - filter after power supply, for a Rasberry Pi

[peraka]

Hello!

I am designing a circuit to filter the noise from the power supply that I am going to use to power a Raspberry Pi, and some other circuits. I also want to use the same filter to filter out the noise from the supply pins from the Raspberry Pi.
I am currently studying electronic engineering, and i am still a noob at designing.
I have been taught at my uni that i can use a PI-filter after the power supply. The picture under shows the PI-filter that we used at the uni.

The power supply that i am using is a 5V power supply, with a 6A max, link under:

IRM-30-5ST | MEAN WELL Strømforsyning med vekslemodus, industriell, 30W, 5V, 6A | Elfa Distrelec Norge

Kjøp Strømforsyning med vekslemodus, industriell, 30W, 5V, 6A. Kjøp våre nyeste Switch-mode strømforsyninger-tilbud. Levering neste dag tilgjengelig.

www.elfadistrelec.no

My problem is that I am designing this in easyEDA, and i want the PCB do be assembled when i recieve it. JLPCB does not have a 100mH inductor that can be assembled by them, at least from from what I can find. Do you have any suggestions what i should do?

I thought about finding the cut off freq, and find a random inductor, and then calculate which capacitor i should use. But i was taught that i should use a big inductor for filtering a power supply, for high freq suppresion.

Another idea that i thought about was using this:
BNX026H01L
to use as a filter. But this was so expensive.

I appreciate all the help I can get! I do not even know if the PI-filter is my best solution for the problem that i have )

 

[KlausST]

Hi,

sure 100mH? 100mH @ 6A is huge!

And it stores a lot of energy ... thus on sudden disconnect you may get rather high energy peaks and ringing.

In my eyes: I´d but a decent power supply with low ripple. Then add a simple filter. And for sure: A good PCB layout is essential.
This means: for example.. when routing the input capacitor (where I´d use a ceramics one) ... if done wrong, it does not do anything useful, if routed correctly it will remove amost all HF noise.
Correct way without common mode filter is:
* powerconnector_GND --> capacitor --> GND_plane
* powerconnector_5V --> capacitor --> 5V_application
No T-branch. Route IN and OUT directly to the capacitor_pad.

Btw: I´d add some common mode filter. Nothing fancy. Just to avoid HF ground loops.

Klaus