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TPS552882: Intermittent Failure on Power-On

Derick Louie
Prodigy 10 points
Part Number: TPS552882

Tool/software:

Hello,

I'm having an issue with the TPS552882, where it will intermittently (1/20+ times) fail on power up. This has been replicated on 5+ boards now. The failure only occurs on startup- never during operation. Once the part has failed, there is a short between VOUT(+16V) and GND. The component operates at an input voltage of 12-24V, and typically only draws 1-2A. 

I've attached the schematic and layout below for feedback. Any suggestions are appreciated.

Thanks.

  • 0
    TI__Mastermind 27750 points

    Hi Derick,

    May I know what is the application here?

    1. Is the device damaged or can re-startup in another cycle?

    2. I can't find how the Vout is connected with Cout, can you share the screenshot of each layer of the layout?

    3. What is the part number of the output capacitors? We need to know the ESR value to check the COMP parameters.

    4. Do you have any waveforms at the startup?

    BRs,

    Bryce

  • 0 in reply to Bryce Xun
    Prodigy 10 points

    Bryce,

    The application is for powering another 4 channel buck converter and powering off the shelf stepper motor driver modules on a separate board. 

    1. The device is damaged and not recoverable.

    2. I've attached a screenshot of the second layer.

    3. C6, C7, C22: C5750X5R1H106K230KA 

    C8, C9: 25SVPF56M

    4. No, but I can work on getting some.

     

  • 0 in reply to Derick Louie
    TI__Mastermind 27750 points

    Hi Derick,

    Thanks for feedback, we will check it later.

    BRs,

    Bryce

  • 0 in reply to Bryce Xun
    Prodigy 10 points

    Bryce,

    Any update?

  • 0 in reply to Derick Louie
    TI__Mastermind 27750 points

    Hi Derick,

    Thanks for your patience.

    1. Can you provide any waveforms when the device got damaged? You can use single mode of the oscilloscope and trigger the inductor current to capture the waveforms of SW1, SW2, Vout and iL.

    2. The layout is very poor especially for the output capacitor placement, which could cause high voltage spike and cause the device failure. You can try if add one 0401/0.1uF as the below red shows, to see if it helps.

    BRs,

    Bryce