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TPS54308: Schematic revive request

Ganjiguur Amarsaikhan
Prodigy 20 points
Part Number: TPS54308


Tool/software:

Hi team ! I'm trying to design 8.5V~5.5V battery to 5.2v 2A converter with the mentioned buck regulator. Reason I asking is that webench simulation and data sheets recommended schematics has used  different values of inductor and feedback resistor configuration. According to the webench used 6.2uH inductor and 13.3K ohm but in datasheet FB resistor value calculation. But that come with 6v output according to the datasheet calculation.
 

  • +1
    TI__Intellectual 2870 points

    Hi Amarsai,

    Schematics seems fine but there are few changes need to be made,

    Rbottom needs to be 13K ohm to get an output voltage of 5.2V.

    As, Vout = Vref(1+Rtop/Rbottom)

                  = 0.596(1+100/13) ~ 5.2V

    With 18k ohm you will get an output voltage around 3.9V.

    Best regards,

    Usha.