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Support Request for Selection of regulators

Krishna A R
Prodigy 190 points
Other Parts Discussed in Thread: TPS40140, TPS53353, TPS51315

Since I am a novice to on-board regulator design, I place this request to you.

We need the following three regulators for designing a board:

  1. 3.3V/7A regulator
  2. 0.9V(preferably) or 1V/12.105A
  3. 1.1V/14.28A

All the above three voltage levels have to be derived from +5V supply (made available by +5V adapter)

Please suggest some best performing/most sought after regulators for this spec from TI product line.

Thanks

Krishna.

  • 0
    TI__Mastermind 49370 points

    Hi Krishna,

    I would suggest the following combinations:

    1. Two controllers: TPS51315 or TPS53353 single output for 5Vin, 3.3V/7A, TPS40140 for dual output +CSD86350 MOSFET for 5Vin, 0.9V/1V/12.105A, 1.1v/14.28A

    2. Three controllers: TPS53353X3 for all three outputs, no external MOSFET needed.

    Please check the datasheet and EVM user's guide for performance.

    Thanks,

    Nancy

     

  • 0 in reply to Nancy Zhang
    Prodigy 190 points

    Nancy,

    Tthank you for your quick help.

    I would like to go with TPS51315 for 3.3V/7A requirement &TPS53353 for both 0.9V/1V/12.105A and 1.1V/14.28A.  I favour TPS53353 because it doesnt require ext MOSFET.

    Hope this seems to be another good option.  How does it sound, Nancy?

    With Thanks and Best Regards,

    -Krishna.

  • 0 in reply to Krishna A R
    Prodigy 190 points

    Hi Nancy, I think TPS51315 for 3.3V/7A doens't require ext heat sinks for cooling.

    But not sure of the other one TPS53353 for the given rating.

    Would you please confirm these?

    Thank you.

    -Krishna

  • 0 in reply to Krishna A R
    TI__Mastermind 49370 points

    Hi Krishna,

    It sounds good. TPS51315 and TPS53353 are very similar controllers. Both are D-CAP mode control with fast transient response and no loop compensation. They also integrated MOSFET. This will make your design simple. I attached an excel file of TPS51315 for the power loss calculation and external components selection. You can easily modify  the parameters for TPS53353 calculation. Remember The Rdson of integrated MOSFET of both parts are different. Please let me know if you have further questions.

    Thanks,

    Nancy

    6283.TPS51315_DESIGNE_TOOLCisco.xls

     

     

  • 0 in reply to Nancy Zhang
    TI__Mastermind 49370 points

    Hi Krishna,

    TPS53353 doesn't require ext heat sink either at your 5Vin, 0.9V/12.105A and 1.1V/14.28A. We don't have the test data of safe operating area at 5Vin. But we have the test data of SOA at 12Vin. Please refer to Figure 33, 34 (SOA) in the datasheet and Figure 18 (Thermal image) in the TPS53353EVM user's guide. I attached the test data of 5Vin, 0.9V/0A-20A for your reference.

    Thanks,

    Nancy

    0243.TPS53355EVM Efficiency_5.3Vin_0.9Vout_500kHz_10_05_2011.xls

     

  • 0 in reply to Nancy Zhang
    Prodigy 190 points

    Nancy, Thank you very much for your support.

    In the xls for TPS51315, I plugged in the values of Vout, Iout, Vin_min, Vin_nom, Vin_max keeping all other values of the components as suggested in the xls.  To quickly get on with design I have taken all other components and their values as prescribed (though it's only for an expample you have put those values ).  I could see the stability criterion satisfied.  Am I on right track? Or, is there any catch that I need to be careful about? Please suggest.

    With Thanks and Best Regards,

    Krishna.

  • 0 in reply to Krishna A R
    TI__Mastermind 49370 points

    Hi Krishna,

    That is great and you are on the right track. After you have done all three designs, you can send me the schematics and I will review for you. I am very busy these two weeks. I should be available at beginning of Feb.

    Thanks,

    Nancy 

  • 0 in reply to Nancy Zhang
    Prodigy 190 points

    Thank you very much Nancy.

    Will send it in another two weeks. So kind of you. Please review it and let me know the corrections, if any.

    I would post my concerns, if any, pertaining to the design during design phase

    Lots of thanks,

    Krishna.

  • 0 in reply to Krishna A R
    Prodigy 190 points

    Hi Nancy,

    Power Supply design has been completed with your valuable inputs and documents.

    Now, I would like to request you to review the same. May I request your e-mail id to send it to you directly?

    My e-mail id is:  krishna@meltronicsgroup.com

    Thank you,

    With Thanks and Best Regards,

    Krishna.

  • 0 in reply to Krishna A R
    TI__Mastermind 49370 points

    Hi Krishna,

    It is great. My email address is nancy_zhang@ti.com. Please send your design to me directly.

    Thanks,

    Nancy