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UCD3138: UCD3138RJAR DPWM OUTPUT HIGH DURING V33D START-UP

Part Number: UCD3138

Hi Sir:

We are using UCD3138RJAR to replace old UCD3138RHAR, while we found this issue during test; at high temperature, like 70'c, we saw DPWM output high following V33D during start-up, waveform is attached;

CH1:V33D, CH2:DPWM0B

after that, the UCD3138RJAR could work normally; when we use old UCD3138RHAR, we didn't see this issue;

so what happened to UCD3138RJAR

the top mark for this lot of UCD3138RJAR is 6BJ   P1JF  G4

  • Hi Jun,

    An AE should be helping on your question soon.

    Regards, Brian

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  • Hi, Sean,

    As you said, you don't have cap between V33D and BP18. The cap is needed to remove the pulse during start up. Please refer to the D/S for more detail.

    Regards,
    Sean
  • In reply to Sean Xu:

    thanks a lot Sean, and thanks big boss;

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