• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 99 subscribers
  • Views 690 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Questions about C6678 SmartReflex Power Using LM10010

Jin HAO
Prodigy 150 points
Other Parts Discussed in Thread: LM10010, LM21215A, TPS56121, LM10011, UCD9222

Dear Sir/Madam

We want to use LM10010 to implement the SmartReflex CORE power supply.

And, can you please send us any materials/datasheets about LM10010+LM21215A power C6678 test result/test data?

We found LM10010+TPS56121 power C6678 test data on the TI's website.(PMP7256 board). But TPS56121 does not have sync function. This is the reason, why we want to use LM10010+LM21215A(Same as LM10010EVM).

By the way, Can LM10010EVM directly support C6678 DSP Smartreflex?

Thank you!

Regards,

Jin HAO

  • 0
    TI__Mastermind 42545 points

    Hi Jin,

    The LM10010+TPS56121 solution was designed specifically for Keystone I devices including the C6678 and it meets the +/-5% voltage requirements for CVDD.  In chapter 3 of the PMP7256 test results you will see that precision resistors are used to achieve that regulation. I  don't have any information the solution used on the EVM but I doubt that they are using precision resistors on the feedback path.  You should post a question to the power supply forum or contact your local FAE. 

    You should also ask for advanced information for the LM10011 which is the next generation of that component.  The LM10011 is a pin compatible part that is more tightly regulated allowing the use of 1% resistors in the feedback path and adding a mode pin and a voltage preset capability through a resistor value.  The LM10010 contains two pins, pin5 & pin6, that are labeled NC.  The LM10011 uses pin 5 as a mode pin and pin 6 as a set pin.  You should include a resistor between pin 5 and ground to set the mode to 0 for 6 bit VID.  You should also include a resistor between pin 6 and ground to allow an initial voltage setting to be defined.  With the addition of these two resistors to your design you will be prepared to substitute the LM10011 when it is available.

    Regards, Bill

  • 0 in reply to Bill Taboada
    TI__Mastermind 30825 points

    Also, that Datasheet's for the devices are the first link on their product page (click the product number that you posted and it will take you to the product page.)

    Best Regards,
    Chad

  • 0 in reply to Bill Taboada
    Prodigy 150 points

    Hi, Bill

    Thank you so much for your help!

    And,  about LM21215A+LM10010, we found in Ti's offical datasheet of LM10010: snvs717b.pdf page 9, this combination seems support C6678 DSP. Can you give me any more information about this? Or can recommend me to someone who can help me with this question?

    You know, TPS56121 does not have SYNC pin, so we can not use Spread Spectrum on that chip. That is the reason, why we need a DC/DC controller with SYNC pin on it.

    And, LM21215A does have sync pin.

    So, if Ti has any official recommended schematic and BOM for using LM21215A+LM10010 power C6678DSP, can you please share these materials to me?

    Thank you!

    Regards,

    Jin HAO

  • 0 in reply to Jin HAO
    TI__Mastermind 42545 points

    Hi Jin,

    I understand what you're looking for but as a member of the Multicore Processor Group I don't have any information on the LM21215A.  We commissioned the reference design using the LM10010 and the TPS56121 as an alternative to the digital power solutions based on the UCD9222 but we don't have a schematics or BOM based on the parts that you have suggested.  You will have to contact the power supply group within TI or post to one of the power supply forums.  I agree that the LM21215A appears to be a usable solution but you will have to do the analysis to ensure that the total of the DC error and the AC ripple does not exceed the +/-5% tolerance required by the C6678.

    Regards, Bill

  • 0 in reply to Bill Taboada
    Prodigy 150 points

     BIll

    Thank you so much for your help!

    Jin