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TPS61181A: open string

Hiroshi Sato
Expert 2590 points
Part Number: TPS61181A

Hello,

Our customer ask us about the behavior when a string is open.

Please see attached file and give us your opinion/advise.

Thanks and best regards,

Hiro

TPS61181A_inquiry.pptx

  • 0
    TI__Expert 4550 points

    Hi Hiroshi-san,
    When one string is open, the others should be still on.
    May I know when all the six strings are connected well, does the driver working normally? Normal startup and stable working ?

    I am confused about your waveforms. IF the LED string is open, why the voltage of TP258 and TP257 is the same.  There should be no such high voltage on TP258 since it is open. 

    what is the LED voltage here? Please make sure voltage on IFB1~4 doesn't meet IFB ovp when Vout reaching Vout OVP voltage. 

  • 0 in reply to Caryss Li
    Expert 2590 points

    Hello Caryss-san,

    Thank your for replying, I had told your offer to the customer.

    Now, re-check and measurement will be taken, please wait for a while.

    Thanks and best regards,

    Hiro