The current rating they state is to make up for short comings of many wall plug power supplies. Critical part is the "step response", how it responds to the instantaneous high current load. So keep that in mind and I am not stating this as an attack on the 5 amp requirement as stated by the factory. Cheap supplies will have a voltage "ring" on the leading edge of the current impulse. This not only drops the voltage it also increases the voltage, very bad condition even thou its just a transient effect.
I'm still waiting for a usable power supply to be available in Canada before I can get my Raspberry Pi 5 going
Had our board on just to install Ubuntu using a sata SSD and it was under 2 amps if memory is correct.
What I use here is a lab supply, cut the connector off of a USB cable. The large wire is + and the braid is -.
This also gives you some insight into the quality of the cable. We cut the connectors off of many cables, guess what. Some are using the small diameter data wires for power..
That cable is EXTREMELY critical, in simple terms apply ohms law. Keep in mind when systemd fires up it lights up all the cores for a fast boot. Plenty of current. On our Variscite, Khadas and AI64 boards I use a medical spec wall transformer, they are much tighter than general purpose.
On something critical like that I would buy from a top tier source like digikey or mouser, they have accountability. They should ship quickly to Canada, at least I am assuming since they are northern part of USA.
Statistics: Posted by foxsquirrel — Sun Dec 10, 2023 3:14 am