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TPS92630-Q1 single LED short with Fault pin's active

Jacky Chen29
Genius 4735 points
Other Parts Discussed in Thread: TPS92630-Q1

Hola TI,

Sorry, I posted this question in LED driver forum before but there is no one can reply my question！So I re-post my question here and hope somebody

can reply my urgent issue. Thanks ～

We used TPS92630-Q1 in our new project design and have found one issue about we cannot get the fault signal from FAULT pin.

After analysis, we found the reason that why we cannot get the open load signal.

The problem is from DC20 and DC19 TVS diode.

If we put the TVS diode at the Iout path then we cannot get the fault signal active even we remove the LED module.

This may have the ESD protection issue, does TI have any suggestion for this？

By the way, if the Vin is 12V then we will get the Iout voltage over 12V or it will be less than 12V in maximum output current？

Thanks !

LED module
 
cid:image001.png@01D13C12.81C8E680
  • 0
    TI__Guru**** 191445 points

    I doubt that anyone on this forum will know the details of your LED driver.  Let me see if I can find some support for you with the LED driver team.

  • 0 in reply to JohnTucker
    TI__Guru**** 191445 points
    Why would this be moved to ac/dc and isolated dc/dc forum? We should move it back to LED driver forum...
  • 0 in reply to JohnTucker
    TI__Guru**** 191445 points
    Unfortunately I do not have access to the MSA support team documents. Let me see if someone knows who supports this.
  • 0 in reply to JohnTucker
    Genius 4735 points

    Hola John,

    Thank you for your prompt reply and help.

    You could refer to below data link to know that why I need to re-post LED driver question at DCDC forum due to no one reply it in LED Driver Forum from 1/21 till now！！

    e2e.ti.com/.../1751264

  • 0
    TI__Expert 5380 points
    Hi Jacky,

    Sorry for the late reply, I'm the application engineer who is in charge of TPS92630-Q1. As the corresponding forum for this part is in automotive forum instead of LED driver forum. So I recommend to post the questions in the automotive forum, so that I can notice it and reply it in time. If you have any urgent case on the application, please feel free to shoot me email.

    May I know the TVS voltage of DC20 and DC19? What i the LED number and forward voltage?
    Only when Vin-Vout <100mV, there will be a open fault on the TPS92630-Q1.
    Actually if the TVS voltage is low, the current can flow through the TVS directly. So the TVS will act as the LED load.
    Because TPS92630-Q1 is a linear regulator, so the output voltage will be smaller than the input voltage all the time. Because there must be a voltage drop between VIN and IOUT to maintain the output current.
  • 0 in reply to Anda Zhang
    Genius 4735 points

    Hola Anda,

    You are my hero...I got the response finally.

    [Anda：]

    May I know the TVS voltage of DC20 and DC19？What is the LED number and forward voltage？

    [Jacky：]

    VISHAY (VESD05A1B-HD1-GS08) 6.8V TVS & LED is 3V forward voltage the number is one.

     

    BTW, can you help to move this question to automotive forum？Thank you ～