UCC28950: burst mode VDS waveform is abnormal and has audio noise

user6004348

Part Number: UCC28950

Tool/software:

HI TI team

I have an 800W model. When operating at no load, the VDS wavefore becomes abnormal and audio noise occurs.

Is there any way to improve these problems?...

TKS

0 Mike O' 11 months ago

Hello,

I am reviewing your inquiry and will get back to you shortly.

Regards,

0 Mike O' 11 months ago in reply to Mike O'

Hello,

Have you tried setting the burst mode of the design to the minimum on time through RTMIN?

Regards,

0 user6004348 11 months ago in reply to Mike O'

HI SIR

I have adjusted RTMIN to 10K, but the issue has not improved.

0 Mike O' 11 months ago in reply to user6004348

Hello,

If burst mode is undesirable you could add some preload to ensure the device does not go into burst mode.

I would just add enough load to prevent it from going into burst mode so it does not hurt effiency.

Regards,

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