DC-DC SMPS Inductor got sound! - diyAudio
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Old 18th July 2008, 09:06 AM   #1
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Default DC-DC SMPS Inductor got sound!

HI,
Sorry ,if there is similar topic somewhere in this forum, I've tried search but no match found!
This is the first DC/DC 12-19V SMPS I've build,but when I first boot up no smoke! *Lucky* , then I tried to load to 5A using dummy load.. sound comes out from the inductor i think so.. *heeeeeeeee.....* sound continuously.
Is it normal? How to make the sound disappear?

http://www.peony888.com/VS/DSCI1267.JPG
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Old 19th July 2008, 07:12 AM   #2
luka is offline luka  Slovenia
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Hi

wire on toroid is vibrating, some kind of varnish over it. It could be too because of unstable feedback, rapid changing duty cycle would do that too
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Old 19th July 2008, 03:41 PM   #3
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Thanks man . I got that!
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Old 28th July 2008, 12:24 PM   #4
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if the core is broken anywhere,vibration also occurs.As Luka said,some varnish is good for vibration.Feedback compensation.
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Old 28th July 2008, 02:54 PM   #5
chimi is offline chimi  Argentina
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Seeing the pic you posted, like the boys already said, and for the problems i have myself, it's the compensation, that noise is due to fast-changing duty cycle no doubt!!! the questions are: is it current or voltage mode? is the current sense resistor the right size? has the design single point ground for the control logic? if it is a flyback type converter, at 5A the peak currents must be big so, have you used any kind of switching transcient snubber?

Cheers!!
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Old 11th August 2008, 08:53 PM   #6
Tolik is offline Tolik  Israel
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As Luka mentoined - unstable, or wrong (to high) filtered feedback loop. Feedback cut out frequency should to be 5-8% of Fsw, & & should not exeed 10% of Fsw.
Elese check you traffo & inductor for saturation.
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