Question Powering Rasverry Pi 5

[fecetin]

I am about to start building a 3D printer. I already have BTT SKR 1.4 Turbo and Raspberry Pi 5. I could not figure out which way is the best to power Raspberry Pi 5. Here are the options I am considering:

1- Using original adapter of Raspberry Pi 5 which is 5.1V 5A (27W).
2- Using 2nd PSU with either 5V 5A or 5V 10A and connecting on GPIO pins on the Raspberry Pi 5.
3- Using buck converter (this is not my favorite one)


What are your experiences with Raspberry Pi 5? Which option you believe is the best to practice?

 

[5twenty]

Why not use the USB port on the SKR to power the pi?

 

[5twenty]

Voron-2/firmware/klipper_configurations/SKR_1.4/Voron2_SKR_14_Wiring.pdf at Voron2.4 · VoronDesign/Voron-2

Voron 2 CoreXY 3D Printer design. Contribute to VoronDesign/Voron-2 development by creating an account on GitHub.

github.com

 

[vinnycordeiro]

Why not use the USB port on the SKR to power the pi?

The 5V power regulator of a SKR 1.4 Turbo isn't able to handle the power required by a Raspberry Pi 5. Looking at the datasheet of the component (a SGM6130 power regulator), it's able to handle up to 3A only, and we also need to remember that on this particular board the 5V regulator feed the regulator for the 3.3V line as well.

There's a reason why an external power supply is suggested for the Raspberry Pi.

 

[5twenty]

Ah, yes...pi5

 

[lord-carlos]

The pi5 will limit the boost clock if it does not get enough power, and AFAIK it's still faster then a pi4 even in that mode.
So it might work and give you decent performance. But it's probably not optimal.

Btw, what is wrong with a buck converter?