UCC28C44: when the UCC28C44 start up at no-load condition, it will have a hiccup and then start up

Brian Li

Part Number: UCC28C44

Hi team,

My customer is suing the UCC28C44 and they find when the UCC28C44 start up at no-load condition, it will have a hiccup and then start up:

Could you please kindly help check is it correct for the device & how to avoid this & if they will use this for production, will this have any risk?

CH1(yellow)：COMP voltage CH2(green)：CS voltage

Thanks,

Brian

10 months ago

0 Manuel Alva Hernandez 10 months ago

TI__Expert 8601 points

Hi Brian,

Would you please share schematic and also and most important show Vcc waveform while doing that test. It might be that Vcc is triggering UVLO at no load. Also, how long does it take after that hiccup to start?

Thank you.

Power management

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UCC28C44: when the UCC28C44 start up at no-load condition, it will have a hiccup and then start up