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TPS54335A: Regarding the design (Comp) when using TPS54335 with 24V input

Nobuyuki Nakao
Prodigy 10 points
Part Number: TPS54335A

Tool/software:

We were using it to step down 12V to 5V.
In another product, we would like to use it to step down 24V to 5V.

Questions

1) Are there any points I should be careful about regarding the COMP terminal(7pin)?
I think the COMP terminal is an output terminal, but will the output voltage of the COMP terminal change if 24V is input?
I'm concerned about the withstand voltage of the element connected to the COMP terminal.

2) Other than the voltage resistance of the elements to be connected to the input terminal, I would like some advice on any precautions to take when changing from a 12V input to a 24V input.

  • 0
    TI__Mastermind 27276 points

    Hi Nobuyuki

    Yes the COMP is output terminal but the voltage level is low, components with 10V voltage rate is enough. 

    You might select larger inductance as the ΔiL is larger when Vin=24 under same BOM.

    You can also use the WEBENCH TOOL to help with the design webench.ti.com/.../311

    Thanks and best regards.

  • 0 in reply to Gui He
    Prodigy 10 points

    GUi He-san

    Thank you for your comments & advice.

    I could understand that the element (C) connected to the COMP terminal will be fine with a voltage rating of 12V when designed.
    I also understand that it is best to pay attention to ΔIL and reconsider the inductor.
    Thank you!