I am designing a SMPS but found out that monolith ferrites have more stable curves on oscilloscope and not make any hearable noise! but about EI or EE cores everything is awful! to much audio noise you can hear from core and voltage and current curves in oscilloscope have too much oscillation and spikes. what is my problem? and why open side (monolith ) ferrites code are like this?
monolith ( open side ):
two halves ( close side core):
monolith ( open side ):
two halves ( close side core):