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TPS65296: Thermal Shut Down

user6342548
Prodigy 160 points
Part Number: TPS65296

Hi Sir，

After power on, the shell temperature of TPS65296 rises above to 85 ℃ quickly (Ambient temperature 25℃). Then the power chip triggers the thermal protection mechanism.
What are the possible reasons for this phenomenon?
  • 0
    TI__Expert 7500 points

    Hi Users,

    How does chip be soldered? 

    What is the output loading?

    Can you capture the power on waveforms including VIN, Vout, SW and IL (If IL is not okay, taking Iout instead).

    Thanks,

    Lishuang

  • 0
    TI__Mastermind 18510 points

    Please share your schematic and layout picture for review.

    And what's your test condition? Vin/loading for each rails...

    Yuchang

  • 0 in reply to Yuchang Zhang
    Prodigy 160 points

    Hi Sir，

    The VR is used to power LPDDR4X.

    Schematic is  is shown in the figure below，R765 Not Loaded.

    BRD 14 Layers.  Layer 2/4/6/9/11/13 is GND.

        

     

    The voltage output waveform is shown in the figure below，

  • 0
    TI__Mastermind 18510 points

    Hi,

    Schematic looks well

    Layout also seems ok, I just see BST line is a little narrow and I can't find Vsense line clearly, you may double check and make sure the line is away from the switching noise source.

    Based on your design, if the loading is in proper range and soldering is good enough, OTP should not happen, suggest you check the loading value of each rail firstly? maybe you can check the inductor current to make it..., for LDO, maybe you can disable it to check if the IC work normally only with two buck rails.

    Yuchang