HiFiBerry digi+ PRO don't works with linear PSU

I'm trying to get working the Digi + Pro on my Raspberry PI 4 with an linear PSU (this: Assembled S11 with 5V DC output) and  Volumio.

The raspberry PI works, volumio start, but the DIGI + PRO do not emit any signal. 

When I give power to the raspberry using the standard PSU the DIGI + PRO works fine.

I've checked the Linear PSU output voltage, everything seems ok.

Anybody can give me an advise or suggestion?


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