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TMS320C6654: CVDD power supply design for C6654

Ramgopal Divakar
Expert 1230 points
Part Number: TMS320C6654
Other Parts Discussed in Thread: LM10011, TPS53681, UCD9222, UCD9222-EP, TPS54424, TPS54521, TPS65400

Hi!

I have a new design with C6654 and I saw the evaluation board uses C6657 and UCD9222 but UCD9222 is NRND and the recommended replacement TPS53681 it looks like works with LM10011. I would like to design a power supply for this DSP.

Input voltage 12V, output CVDD 0.85-1.1V, output 3A (The excel calculator came to 2A)

It looks like I can take two solutions:

LM10011 with a DC-DC

Will this work as I see a design for 5A - http://www.ti.com/lit/df/tidr731/tidr731.pdf

and it not suggest me an alternative reference schematic for powering C6654 DSP

Second solution

I can use the solution from the eval board and can I replace UCD9222 with UCD9222-EP? Or how else can I do it? I would take the easier approach non-analog because I understand I have to program UCD9222-EP part the very first time?

Otherwise

Give me the most optimal solution. This is not a complex part and the current draw is only 3A max worst case. The excel calculator came to 2A.

Thanks,

Divakar

  • 0
    TI__Mastermind 46460 points

    Divakar,

    Please see this post: 

    Tom

  • 0 in reply to Tom Johnson 16214
    Expert 1230 points
    Thanks,
    I went through the post. Why are they saying CVDD is 0.7-1.1? I thought C6654 and C6655 (checked the datasheet) CVDD range is 0.85 to 1.1. At the end the recommended device is TPS54424 .

    Can I use TPS54521 and the circuit in the link below? The circuit has already been designed for 5A and this will work for me.
    www.ti.com/.../tidr731.pdf

    My current calculation is not more than 2A. I used your excel power calculator C6654_Power_Spreadsheet_Rev_2_0.xls
  • 0 in reply to Ramgopal Divakar
    TI__Mastermind 46460 points

    Divakar,

    The VID codes used by this AVS technology support a range of 0.7V to 1.1V.  The full set of VID values is shown in the KeyStone I Hardware Design Guide (SPRABI2).  That does not contradict the operational range of the AVS for this specific device.  You are correct that the C6654 has a CVDD range limited to 0.85V to 1.1V.

    Sure, any of the AVS power solutions shown in TIDR731.PDF can be used.  Another interesting device that can be paired with the LM10011 and the C6654 is the TPS65400 PMIC which can supply all 4 required supply rails in a single package.

    Tom