Comment by tjoff
17 days ago
It is part of USB-PD though, it is just a recent addition (PPS) that isn't that common yet.
I agree it isn't ideal, but you shouldn't blindly buy a PSU to any computer. Extra easy mistake to make when it is USB-C though.
17 days ago
It is part of USB-PD though, it is just a recent addition (PPS) that isn't that common yet.
I agree it isn't ideal, but you shouldn't blindly buy a PSU to any computer. Extra easy mistake to make when it is USB-C though.
I can’t find any evidence that RPi5 supports PPS or that anyone makes a 5V/5A PPS charger, except perhaps a massive 100W charger or something along those lines. It’s a silly voltage/current combination.
edit: PPS is not supported. See:
https://forums.raspberrypi.com/viewtopic.php?t=359918
https://github.com/raspberrypi/rpi-eeprom/issues/497
Oh, so it needs a 5A power supply. The problem is that usually requires a >60W supply, which will be willing to provide 5A. It also requires a marked cable. I think it can legally be done with PPS if power supply supports 5A.
It is weird that Pi5 doesn't do USB-PD 27W supply which is common. It would require converter from 9V. But that would cost money.
The problem is that the Pi requires specific combination of (5V && 5A), which is rare. IIUC even many 65W adapters don't support it.
I wonder if it has to do with the fact that Pi is shipped as a bare board without case. Power circuits are sometimes required to have enclosures.
Thanks for the correction!
PPS is getting more common. Quite a few phones need PPS for fastest charging so seeing more chargers that support it. It is still cheaper to buy official charger but barely. And there are multi-port chargers where might be able to support multiple Pi5.
The Pi cannot negotiate PPS. It needs the profile to be a default offering, which is extremely rare.
> but you shouldn't blindly buy a PSU to any computer
Make up your mind.
Or you don't need to bother with RPi PSUs or you shouldn't blindly buy a PSU to any computer.
It's even more ridiculous what you were proven wrong in your assumptions about RPi PSU.
It wasn't my assumptions that was wrong, my research (early days of the Pi5) suggested it. Which matches the github issue where the belief was that PPS was supported.
But even if that was the case you shouldn't blindly buy one where the specs match.
Is it good quality, is it made for 24/7 operation, does it get hot etc.
In the Pi case it is quite simple. The official one isn't expensive and it is ubiquitous. It runs fine on most supplies though if you need one in a pinch. But I do recommend going for the official one for long term use.