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TPS43060: 12Vin / 48V2A output application

Gary Teng
Genius 5860 points
Part Number: TPS43060

Hi Sir,

 My customer want to use TPS43060 for 12Vin / 48V2A application. We've ever use webench to run it earlier.

https://webench.ti.com/power-designer/switching-regulator/customize/633

 But we can't generate the new simulation now and there's warning infomation:

"Calculated duty cycle exceeds limit Min junction temperature exceeded Calculated duty cycle exceeds limit/"

 1. Can customer use TPS43060 for its applicaiton if they choose better MOSFET for the boost application?

 2. Please help to suggest 12Vin / 48V2A output solution if TPS43060 is not suitable.

 Thanks for your kindly help.

Best regards,

Gary Teng

  • 0
    TI__Guru 58681 points

    Hi Gary,

    the issue reported says that the duty cycle limit is of the TPS43060 is hit. This can not be avoided by another MOSFET.

    Just use the Webench to let you suggest other solutions with your design specification entered.

    Best regards,

     Stefan

  • 0 in reply to Stefan Schauer
    Genius 5860 points

    Hi Stefan,

     In product page, TPS43060's duty is 95, and our application's duty is 75 (input: 12V / output : 48V). Why that show duty cycle limitation?

  • +1 in reply to Gary Teng
    TI__Mastermind 19715 points

    Hello Gary,

    In some cases, Webbench Designer is somehow "tricky" to use.
    It takes a lot of parameters of external components (Diodes, FETs etc.) into account and sometimes the modelling of these components is running into limitations.
    Also, the error messages may not reflect the true reason for a failure.
    In most cases this has nothing to do with our own controller.

    The TPS43060 can definitely be used for a 12V -> 48V booster.
    See also the TPS43060EVM-199 which can be modified to deliver up to 60V output voltage:
    www.ti.com/.../TPS43060EVM-199

    It took me a while to create the Webbench design in one go.
    - Enter TPS43060 (BOOST)
    - Vin Min = 12V, Vin Max = 12V, Vout = 48V, Iout Max = 1.3A
    If you choose a higher current or a lower Vin Min it will probably not work.

    Once you see the design, you can click on "Change" and try modifying parameters.
    For example, to increase the current to 1.6A I had to reduce the ambient temperature to 25°C.

    For a more precise calculation of the components, I would recommend using the Quickstart Calculator which you can download from here:
    www.ti.com/.../slvc471

    Best regards
    Harry