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Max sum value of vout setting register on TPS51367

Other Parts Discussed in Thread: TPS51367

Hi team members,

 Min sum value of Vout  setting register on TPS51367 can be found 67Kohm  on page 14 in data sheet.

Then, how much value is maximum  ? 

 

Best regards,

Kenji Ito

  • Hi Itoh-san,

    1. the outsourcing capability of REF is 300uA, that is why min sum resistor is 67Kohm

    2. refer to figure.31, REFIN is the input of an op-amp, ideally the input bias current of op-amp is 0, but actually it still draw some input bias current in <1uA (max) range, so suggested maximum resistor is no more than 10 times min, that is 670kohm, in order for proper op-amp input bias current

  • Hi Bill-san
    Thanks . I think so that this impedance is need considering input bias current.

    Regards, kenji Ito