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Power Supply for the DSP

Bendous
Intellectual 340 points

Hello all,

Appologies if this question doesnt fit in here but I can't seem to find the right place for it.

I am designing a PCB around the C6713 DSP. I am looking at the power supply and it seems I need to supply two different levels DVdd (I/O) and CVdd (Core), which should ideally be 3.3 and 1.2V, respectively. Reading through the document: "Embedded Processing Guide", they suggest the use of a very complicated power supply utilising two TPS54350PWP ICs.

Is this necessary??? Could I design my own supply using a simple TRACO DC/DC converter, a couple of regulators, and decoupling capacitors??

 

Any help would be very much appreciated.

 

Thanks all.

  • 0
    TI__Guru* 84110 points

    [Sales pitch] By choosing Texas Instruments for your semiconductor design, you have a huge wealth of products to complete your total design.[/Sales pitch]

    Please check out the Analog eLab at http://www.ti.com/analogelab.

    Click on Power Quick Search under Power Management under the Select column.
    Enter Vin, Vout, Iout and hit enter.

    Solutions will be returned in different categories with the top two choices shown. All can be shown by expanding.

    If any solution has a "Design" button, it will take you to SwitcherPro where a complete design can be returned including layout. A part of SwitcherPro is the What-If button where the design can be checked for stability with different capacitive loads, etc.

    The design offered with the C6713 is a simple yet robust design that can take high input voltages. But you can tailor your supply to fit your requirements.

     

    If this answers your question, please click  Verify Answer  on this reply. If  not, please reply back with additional information.

  • 0 in reply to RandyP
    TI__Guru* 84110 points

    Deciding which device is optimum can be tricky.  Sometimes internal FET parts are better than external FET types and sometimes all that you need are LDO.  Sequencing, slow start, tracking, etc. are system level issues that need to be addressed at the same time if the DSP is sensitive to voltage differentials during startup and shutdown between I/O and core.

    You can save some money by doing the engineering to build an optimum design, and the Analog eLab will be a tremendous help for you.

    Or you can take the simple design from a reference design and go with that if you are only building a few boards and do not want to spend the engineering effort to guarantee your optimum design meets all the requirements of the DSP you are using.