[newbie]hissling sound at inductor

[mingyee]

Hi, I've this power circuit using a LM2576T Switching regulator to have a 13V o/p. I've attached a copy of the schematic. I wonder the inductor I'm using has this hissling sound. At 1st I used RL1955 & then i changed to RL1952. Both also have the hissling sound. Could anyone help me out with this? thank you.

 

[akg]

since this is a switching regulator.. we may suspect the hf current causes core resonance/ magnetostriction that causes the sound ..

 

[mingyee]

mayi know are there any method to resolve this?

 

[akg]

going thru the datasheet i found the freq to be fixed at 52k , may be ur core has a resonance at this or fundamentals..try changing the core , may use other dimentions/shape..so that the resonance is reduced

thanks
akg