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TPS563201 5V Vout Webench simulation

Anthony Lang
Expert 4875 points
Other Parts Discussed in Thread: TPS563201

Hi,

One of our customer tries to simulate TPS563201 on Webench for 5V Vout condition and find that it could not generate design since the warning of too high junction temperature. From our datasheet, it indeed could support 5V Vout application without a problem. My question here is that is Webench simulation only based on limited number of reference design so not all the working condition can be supported? And our customer also hope to get the stability simulation like bode plot, but I also did not find for TPS563201. Is the bode plot function only applied to limited parts?

Best,

Anthony 

  • 0
    TI__Intellectual 805 points

    Hi Anthony,

    If the user created the default condition for the TPS563201 which is a 3A design and then increased the Vout from 1.05 to 5 the regulator will be sourcing 15Watts. If you reduce the current to 1Amp the Webench design will pass a 5 volt output design for the TPS563201.

    Can you share what the design input conditions were for the failing design?

    To address your second concern, the Webench calculation engine is a model based on the physics of the circuit. The model is fully continues across the functional operational space of the device. The model is tuned to match real data sets to within 3% error. So if the device is able to operate at the desired design conditions safely then the Webench model will reflect that behavior.

    With regards to stability response of the TPS563201, this device is a DCAP2 topology which is has internal compensation. Because it has internal compensation we do not produce Bode plots.

    Thank you for using Webench. I hope I answered all of your questions.

    Regards

    -Jason 

  • 0 in reply to Jason
    TI__Expert 4875 points
    Hi Jason,

    The input condition for the customer is 12V. Based on the core engine of Webench, the overtemperature will happen in the real application if it calculate so. Is it correct? In this case, the only way to let our customer solve this issue is to add additional heatsinking. Is there any other suggustions?

    Best
    Anthony
  • 0 in reply to Anthony Lang
    TI__Intellectual 805 points

    Anthony,

    Do you happen to know what the max current load happens to be for the design? Even though the TPS563201 has a max current of 3 amps this can only be achieved under low duty cycle designs ( the Vin is close to the Vout).

    If the user is wanting create higher load designs, they can increase the amount of copper on the PCB around the device.  The TPS563201 comes in a very small package so i don't believe heat-sinking is an option.

    You can analysis the affects of adding more copper to the PCB in Webench using the Webtherm feature.

    In this shared design you can that i'm loading the device with 2.5 amps https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=D2F9D7B634809910

    The calculated IC case temperature is 124.

    The below picture is a thermal simulation with a 2 oz copper layer.

    Here I changed to amount of copper on the PCB to 4 oz  and this brought the temperature down to 100 degrees.

    I hope this helps solve the problem. Also let me know if i can help in any other ways.


    Regards

    -Jason