harvie
Full Member level 1
Hello,
i've designed circuit using ST662 charge pump IC (5V to 12V; 30mA; 400kHz; Clone of MAX662) and the first prototype PCB we've assembled produces slight audible whistling under load. (We are using it to provide 12V supply for small OLED display, which draws around 20mA).
I've gone for charge pump design, since i was thinking that no inductor coil = no possibility of whistling. No i am bit disappointed.
Is this normal? Is there something that i can do about this?
i've designed circuit using ST662 charge pump IC (5V to 12V; 30mA; 400kHz; Clone of MAX662) and the first prototype PCB we've assembled produces slight audible whistling under load. (We are using it to provide 12V supply for small OLED display, which draws around 20mA).
I've gone for charge pump design, since i was thinking that no inductor coil = no possibility of whistling. No i am bit disappointed.
Is this normal? Is there something that i can do about this?