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[newbie]hissling sound at inductor

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mingyee

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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.
 

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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
 
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