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LMR64010: Formula to get R1

Ena Peh
Prodigy 220 points
Part Number: LMR64010


Tool/software:

Hi TI Support,

May I find out more about this formula? Why is the denominator 1.23-1?

  • 0
    TI__Mastermind 20270 points

    Hi Ena,

    When the LMR64010 works normally, the voltage at FB pin equals to the internal reference voltage Vref, which is 1.23V.

    So you will have the formula Vout * R2 / (R1 + R2) = Vref = 1.23V. That's the same formula of R1 = R2 * (Vout/1.23 -1).

    Regards

    Lei