TI TPS568230 Buck Converter

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  • m4a2t0t
    Badcaps Veteran
    • Mar 2013
    • 276
    • USA
    #1

    TI TPS568230 Buck Converter

    Im trying to get this IC to output 3.3V instead of 5V but nothing I do makes it go to 3.3V.

    Vout= .6 X (1 + Rupper/Rlower)

    This table shows using a 90K resistor at the top and 20K on bottom should result in 3.3V but I still get 5.1V. I could only find a 100K and 22K but it still maintains the 4.5 to 1 voltage divider ratio.

    Can anyone see what I seem to be missing?

    Also, that test pad says 3p3 standby SOC. What are the chances that pushing 5V through that fried the SOC or anything else connected to 3.3V? The redriver also has 5V and it supposed to use 3.3V

    Thanks

    datasheet
    https://www.ti.com/document-viewer/T...51#SLVSEY53951
    Attached Files
    Tags: None
    • sam_sam_sam
      Badcaps Legend
      • Jul 2011
      • 6039
      • USA
      #2
      Re: TI TPS568230 Buck Converter

      Are you putting the wiper terminal to feedback pin if not this is part of the problem you have to maintain a certain ratio between R1 and R2 for this to work

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