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Original question:

WEBENCH® Tools/TPS82140: "Design update failed. Junction temperature is too high"

WEBENCH® Tools/TPS82140: Unable to simulate TPS82140SIL in Inverting Buck-Boost configuration

user5276862
Prodigy 20 points
Part Number: TPS82140
Other Parts Discussed in Thread: TPS82130, , TINA-TI

Tool/software: WEBENCH® Design Tools

The WEBENCH Design tools don't seem to permit creation of an inverting buck-boost circuit using the TPS82140.  However the datasheet shows this configuration as an example circuit and the higher current TPS82130 has an eval board and app-note using this configuration. 

I exported a standard buck configuration from WEBENCH into TI-Tina and modified it to an inverting buck-boost as per the TPS82130 app note but it doesn't operate as expected, and I'm not sure if this is a problem with the model or my inexperience with TI-Tina.  The transient simulation runs but I get no output and a very large current flows from the Vin to ground suggesting the 82140 isn't switching.tps82140_inv_buck_boost.tsc

  • 0
    TI__Intellectual 1490 points

    Hi,

    The SPICE model of the IC has GND pin hard coded to '0' node / ground, so you will not be able to simulate IBB configuration using the same model. I am assigning this ticket to the concerned product team so they may provide you with additional info / help if needed.

    Regards,

    Srikanth Pam

    Online Design Tools

  • 0 in reply to Srikanth Pam
    Prodigy 20 points

    Hi Srikanth,

     

    Thank you for the reply.  Hopefully the model can be revised at some point, but I guess it's back to the soldering iron for now.

     

    Regards

     

    Mike

  • 0 in reply to user5276862
    TI__Genius 17905 points

    Hi Mike,

    I've requested the downloadable TINA-TI model from the TPS82140 product folder to be updated to support IBB operation, but it will take several weeks as the modeling team has a queue of requests ahead of this. I would like to mark this thread closed for now, and I will provide an update here once the updated model is available.

    Thanks for your patience,
    Kris