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High-Vin, High-Efficiency Power Solution Using DC/DC Converters with DVFS

Kyle Aven
Intellectual 950 points
Other Parts Discussed in Thread: PMP, TPS62150, TPS62170, TPS62125

I have been researching ways to power the C6748 DSP from a 12V supply and I am interested in reference design PMP4976 that is illustrated in document SLVA339C. My questions are simple I hope. 

1) is the the most efficient way to handle the powering of C6748 from higher voltage rails?

2) Is there an available PCB design i can use as reference for laying out a board with this power solution

Thanks

Kyle

  • 0
    TI__Guru**** 150880 points

    It is best to reference the PMP number in the title of your post.  Right now, your title is pretty generic.

    It doesn't look like there was a board made for this.  The EVMs were likely just wired together to produce the picture.  You can get the gerbers for each individual power converter from their EVM product page.

    There are many ways to structure the power conversion for such multi-rail systems.  The power quick search at power.ti.com can help you find devices that meet your power needs for a given rail.

    The most efficient approach would likely use only one conversion for each output, instead of converting the voltage twice.  So, you would go from 12V directly to 1.2V, etc.  The TPS621xx family is great for this.  I would recommend newer TPS621xx devices over the older TPS6211x family.  Ones to look at would be the TPS62125, TPS62170, and TPS62150.  You can compare the efficiency of any of these converters with the curves in the D/S.

    If you need DVS for the core rail, the TPS6236x family is a good choice.

  • 0 in reply to Chris Glaser
    Intellectual 950 points

    Thanks for your timely reply Chris. After reviewing the datasheets It doesnt appear that supplying Vin directly to the higher voltage rated switchs will increase the efficiency of the design. So I will plan to proceed with the design as shown in PMP4976. Thank you for your help.