Open jeanthom opened 3 years ago
Hey, I tried to replicate that and indeed it seems to be the same with my Lenovo 65W PD supply, but also my other supplies. This is a problem that needs to be fixed. Thank you for bringing this to my attention :)
Did you capture that trace with or without the tip connected/on?
With the tip on. When I disconnect the handle I don't have such oscillations.
Ok.
If I see that right, the oszillations have a frequency of rougly 3 kHz. Does that track with the PWM frequency of the otter iron?
Hi,
I noticed a common issue among USB-C peripherals that are connected to this very specific model of charger: you can hear a faint whine noise, and there is a 1V ripple on VBUS (I'm probing C24 in AC mode in the picture below):
This is due to a too big capacitance on VBUS (USB spec specifies max 10µF). I remember fixing an FPGA board with a fat ass inductor but I'm not sure that this is a good solution.
This might explain the issues I'm facing in #8