All signals from the processor are 3.3V so the 3.3V rectangular wave PWM on the 5V side is also correct. It's a 3.3V logic level output that switches the Buck converter circuit. If I have not understood the question correctly, my apologies.
On Wed, Aug 16, 2023, 8:46 PM Frank <dc8fg@...> wrote:
Hi all,
I am a little bit confused, maybe someone can give me a helpfull hint:
Wondering about my very low power output I started some measurements - beginning with the power supplys. Regarding to the diagnostics screen in the terminal the 3V3 SMPS and the 5V SMPS are marked with 3,3 V and 5 V - everything seems to be ok:
During measurements I could confirm the values in the 3V3 section: Voltage ok, duty cycle ok.:
But the 5V section: Instead of 5 V my scope measures only 3,43V - but duty cycle nearly ok (+ 1%).:
