I am working on a project whereby I need to power the Raspberry PI through the GPIO, rather than the USB-C.
I designed and tested a +12 V to +5 V switching regulator which can output up to 6 A. I've designed a lot of switching power supplies, and the performance of this one was exceptional. The output was 5.07 V at no load and 4.9 V at max load with only 3.7% ripple. Nonetheless, it did not work when I plugged it into the RPi.
As a test, I tried powering the RPI from some benchtop variable power supplies. With one power supply, the RPi would not boot regardless. The startup time for this power supply was about 125 ms. With the other power supply, the RPi would boot, but it would turn off before completing the boot sequence. The startup time for this power supply was about 10 ms. Oddly, when I connected an oscilloscope to the output, the RPI booted without issue, so I could observe first hand whether there was a voltage drop, but the power supply didn't show one.
I set the current limit on both of these power supplies to 4 A.
This lends me to believe that the power requirements for the RPi go far beyond 5 V/5 A. Does anyone have any experience with this? Has anyone ever designed a regulator for a RPi 5? Does anyone know what the actual requirements are?
I designed and tested a +12 V to +5 V switching regulator which can output up to 6 A. I've designed a lot of switching power supplies, and the performance of this one was exceptional. The output was 5.07 V at no load and 4.9 V at max load with only 3.7% ripple. Nonetheless, it did not work when I plugged it into the RPi.
As a test, I tried powering the RPI from some benchtop variable power supplies. With one power supply, the RPi would not boot regardless. The startup time for this power supply was about 125 ms. With the other power supply, the RPi would boot, but it would turn off before completing the boot sequence. The startup time for this power supply was about 10 ms. Oddly, when I connected an oscilloscope to the output, the RPI booted without issue, so I could observe first hand whether there was a voltage drop, but the power supply didn't show one.
I set the current limit on both of these power supplies to 4 A.
This lends me to believe that the power requirements for the RPi go far beyond 5 V/5 A. Does anyone have any experience with this? Has anyone ever designed a regulator for a RPi 5? Does anyone know what the actual requirements are?
Statistics: Posted by a_macdonald — Tue Oct 15, 2024 5:36 pm