Audible noise is coming from my power supply

Aneesh TS

Other Parts Discussed in Thread: UCC28600, UCC28019, UCC28019A

I have designed one power supply using UCC28019 PFC controller followed by UCC28600 Quasi resonant converter but audible noise is coming from my power supply My input and output specifications as follows

Input voltage- 115V ac

input frequency- 360Hz to 800Hz

My PFC stage will convert this to 250V dc and then quasi will convert 250V to 12V/ 60W. I used my own inductor for the PFC stage. Is that Audible sound is due to my inductor or My input input frequency?. Even no load also sound is coming. Is there any problem for using that controller in 360Hz to 800Hz frequency range? Can anybody suggest How to eliminate that noise?

over 12 years ago

0 Lisa Dinwoodie over 12 years ago

TI__Genius 15910 points

Please refer to the following document which addresses audible noise for the UCC28019 and UCC28019A: http://www.ti.com/lit/an/slua688/slua688.pdf

0 Aneesh TS over 12 years ago in reply to Lisa Dinwoodie

Expert 1735 points

Hi Lisa,

Thanks for your reply.

OK first I will try with UCC28019A.

is my input frequency(300Hz to 800Hz) causing any problem? Is that controller really supports this frequency range?

because that reference design is designed for 47Hz to 65Hz

0 Lisa Dinwoodie over 12 years ago in reply to Aneesh TS

TI__Genius 15910 points

Did you input 300Hz for f_LINE(min) and 800Hz for f_LINE(max)in the Design Calculator? I believe the most significant impact would be that you would be able to use a much smaller output capacitor but you would be better off by inputting your specific requirements into the Design Calculator to verify that the component values are adequate to stay in continuous conduction mode and prevent triggering OVP during normal operating range.

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Audible noise is coming from my power supply