I currently using a 4pin fan in my project.
I need to drive the fan with a 120 Hz PWM signal. I read in all the documentation of the fan that the suitable PWM frequency is from 21 to 28 kHz.
I tested the fan using the 120Hz signal and it seems to work well.
Do you think that my configuration can be safe? Is there something that can go wrong driving the fan in that way?