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Duty un-matching issue for UCC2808A

Oliver Ou
Intellectual 2845 points

Hi,

My customer used UCC2808A to deign half bridge to apology and found the duty un-matching issue at soft start condition.

OUTA is always larger than OUTB around 100nS.  That would cause transformer saturation.

Can you help to check and give some suggestion for this issue?

Thanks  a lot.

Oliver Ou

schematic:(Cs=0, fixed signal by compensation circuit  with  from Q409 )

Q

start up waveform: