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TPS54620: TPS54620 Schematic Revision for Powering Xilinx MPSOC and AM5728 Self Designed SoMs for industrial computing

Ignacio Diz Castro
Prodigy 225 points
Part Number: TPS54620
Other Parts Discussed in Thread: AM5728,

Dear all

We´re designing an entire product portfolio for industrial cloud computing

Im designing a carrier board and some SoMs with AM5728 and Xilimx MPSOC

Someone can check this attached schematic?

King Regards


4478.Power.pdf

  • 0
    TI__Guru**** 191445 points

    Generally, we can make a cursory review.  If you would like a detailed review, please provide your design inputs and considerations as well as the methodology you used to derive the external component values.

  • 0 in reply to JohnTucker
    Prodigy 225 points

    Power_hd.pdfDear Sir

    Attached you can find high resolution schematic, im sorry for bad quality of previous

    Thank you so much

    I prefer to proceed as follows:

    Take a view on the schematic and tell me that all seems to be correct to simpy work

    After assemling the board i will perform start up and response testings

    I designed following reference and evk

    If it works ok, i will start trying to optimze design by performing some adjustments and measurements

    King Regards

  • 0 in reply to Ignacio Diz Castro
    TI__Mastermind 25590 points

    Ignacio,

    I used WEBENCH on the TPS54620 product page (right-hand side) and put in 12.1VIN, 5VOUT and 3.3VOUT, 6AOUT and got a schematic very similar to yours.  The only more-than-slight difference is the compensation but that can be modified as you test.

    -Sam

  • 0 in reply to Samuel Jaffe
    TI__Guru**** 191445 points

    I took a look at your schematics as well.  Generally I like to use a HF roll off capacitor on the COMP pin to GND in parallel with the R and C.  Make it be 1/100 of the series capacitor. 

    Typically, you will not have the same compensation for 3.3 V and 5 V outputs.  It is entirely possible you can find a set of values that works for both outputs.

    I see your note to increase BW above 118 kHz and PM to 57 deg.  You are not likely to achieve both of those.  Typically I find TPS54620 max crossover is less than 100 kHz.If you want to extend the BW, you may want to consider adding a feed forward capacitor in parallel with the top FB divider resistor.  For now it can just be a place holder.  I make Fz = 1/2*pi*Rtop*Cff to be just above the crossover frequency.

    If you think you want to tweak the crossover design, I would also place a 0 ohm resistor in series between Vout and the top FB resistor as aa convenient place to break the loop for test purposes.

  • 0 in reply to JohnTucker
    Prodigy 225 points

    I will start with Webench Values (SPICE BASED, so GOOD), after that, if i have any problem, i will let you know !

    Thank you so much, i learn a lot from your comments

    Texas InstrumenTS SUPPORT ITS ALWAYS AMAZING

    kING rEGARDS!