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AM2732: stepdown DCDC convertor for AM2732 evm

Amine LTAIEF
Intellectual 545 points
Part Number: AM2732
Other Parts Discussed in Thread: TMDS273EVM

Tool/software:

Hello i'm working with AM2732 evm board and i need to power it from "Fuse box" of Truck. could you please advice me which circuit can I build it to protect and power my AM2732 evm correctly. 

Now, i'm using "PV6i" for this job.(convert from 24v to 12V)

Regards

Amine

  • 0
    TI__Mastermind 22685 points

    Hi Amine,

    The TMDS273EVM expects a 12V nominal input at the barrel jack input (J12).  This 12V goes into a step down converter (U5 - LM63625) to generate the main 3.3V power rail that powers the PMIC and the rest of the board.  The LM63625 step down converter has an allowable input range of 3.5V to 36V.  As long as your input source is in the allowable range and can supply enough current, you can just connect it straight into the barrel jack (J12).

    Thanks,
    Mike

  • 0 in reply to Mike Pridgen
    Intellectual 545 points

    Hi

    Thank you so much for your reply 

    Please do I need any external protection or and components to protect/isolate  my board ? 

    As I mentioned, the 24v is coming from the Truck fuse box.

    Regards.

    Regarda

    Amine 

  • +1 in reply to Amine LTAIEF
    TI__Mastermind 22685 points

    Amine,

    The TMDS273EVM provides some basic level of power conditioning between the barrel jack and the LM63625 step down converter.  However, this design was implemented with the idea that the power source would be a very stable 12V wall adapter.  Using a less stable source may have some impact on the power rails of the EVM as any noise on the source power rail may show up on the rest of the power rails on the EVM.

    What level of protection or filtering on the source rail that is required by the LM63625 would be a question better suited for the Power Management E2E Forum instead of the Arm-Based Microcontrollers forum.  I recommend creating a new thread in the other forums and specifically ask about source rail requirements on the LM63625.

    Thanks,
    Mike

  • 0 in reply to Mike Pridgen
    Intellectual 545 points

    Thank you so much for your answer.

    I got it.

    Regards