• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 839 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS92515HV: TPS92515HV damaged during Lighting ON Test

Nicky Lim
Genius 3195 points
Part Number: TPS92515HV

Hello,

Customer made TPS92515HV circuit based on Webench simulation.

But during Lighting ON test, some IC got damaged.

So, she wants to get schematic and PCB layout Review from TI.

Could you review attached schematic and PCB layout, and let me get the result?

Also attached used LED spec sheet.

Regards,

Nicky

200W LED PCB.PDF

NV4W144ART-E(4288A)R70 R8000 R9050(NICHIA 11.9V).pdf

  • 0
    TI__Mastermind 25500 points

    Hello Nicky,

    Could you let me know what the input voltage used is?

    My concern is the UVLO setting using the PWM pin. It looks like it is set to turn on at a very low voltage even though the LED stacks look to be 48V stacks. You don't want to start switching until you exceed the LED stack voltage at the input ideally. Another concern is that at full input voltage (I'm assuming >48V) you will be exceeding the abs max voltage of the PWM pin which could cause damage.

    Regards,

    Clint

  • 0 in reply to Clinton Jensen
    Genius 3195 points

    Hi Clint,

    Input Voltage is 50.5V and Ruvlo resistor value selected by attached webench.

    Is there any mistake in Webench file?

    Could you recommend Ruvlo resistor value?

    Regards,

    Nicky

    TPS92515HV_LED_11.9V_700mA_4S_2P_3A Diode.pdf

  • 0 in reply to Nicky Lim
    TI__Mastermind 25500 points

    Hello Nicky,

    Webench doesn't always pick the ideal values for everything, and I'm not sure setting UVLO is even an option or not. But in any case I would probably set the UVLO around 48V or something like that. A 2.2k for the lower resistor and a 102k for the upper resistor would set it at 48V.

    Regards,

    Clint