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TDA2E: TPS65917 SMPS3

Michael Ning
Prodigy 80 points
Part Number: TDA2E

HI TI:

THE SMPS3 of TPS65917 is use for VDD_GPU of TDA2E,

and i need increase the voltage of VDD_GPU about 50mv,

How do I achieve this?


  • 0
    TI__Guru*** 137250 points

    Hi,

    You can try changing the regulator-min-microvolt to the value you want to program. The framework should take care of setting the minimum voltage.
    Or else you can use the U-Boot i2c md commands to program the value that you want.

    - Keerthy

  • 0 in reply to Keerthy J
    Prodigy 80 points

    Hi,

    Thanks for your reply.

    I still have some questions as flow,

    The default setting of <regulator-min-microvolt> is 850000,
    <regulator-max-microvolt> default value is 1250000 in dts;
    The value of VDD_GPU is 1.16v actually measure by multimeter.

    Then set the <regulator-min-microvolt> from 850000 to 1200000,
    the value of VDD_GPU is still 1.16v. Why it seems useless only change the min-microvolt?

    Unless i Set <regulator-min-microvolt> to be equal to <regulator-min-microvolt>,as flow,
    the value of VDD_GPU will be about 1.2v.

  • 0 in reply to Michael Ning
    TI__Guru*** 137250 points

    Hi Michael,

    Michael Ning said:
    Unless i Set <regulator-min-microvolt> to be equal to <regulator-min-microvolt>,as flow,

    That is one good way to do that. The easiest way in fact.

    Michael Ning said:

    The value of VDD_GPU is 1.16v actually measure by multimeter.

    Then set the <regulator-min-microvolt> from 850000 to 1200000,
    the value of VDD_GPU is still 1.16v. Why it seems useless only change the min-microvolt?

    I can say may be driver has its own minimum data that is getting over-ridden. If this is for one time setting then what you have done with both min/max at 1.2V is correct.

    - Keerthy