[newbie]hissling sound at inductor - Electronic Circuits Projects Diagrams Free

mingyee · 5th October 2005, 06:26 AM

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 · 5th October 2005, 12:43 PM

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

mingyee · 7th October 2005, 05:56 PM

mayi know are there any method to resolve this?

akg · 10th October 2005, 10:19 AM

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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5th October 2005, 12:43 PM	(permalink)
akg	since this is a switching regulator.. we may suspect the hf current causes core resonance/ magnetostriction that causes the sound ..

7th October 2005, 05:56 PM	(permalink)
mingyee	mayi know are there any method to resolve this?

10th October 2005, 10:19 AM	(permalink)
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