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TPS6103X power save mode

MD Home
Intellectual 840 points

Hello All,

I have few question regarding TPS6103X

- How do we know when this IC operate in power save mode?

- In power save mode, some puls skiping?

 

MD

  • 0
    TI__Intellectual 1305 points

    Hi MD

    As you can see in the datasheet, when device enters power save mode, some pluse is skipping and the output voltage ripple get larger. All these phenomenon indicates that it has entered power save mode.

    If you mean "at what load condition" it will enter power save mode, it's hard to define. Because it has some relationship not only with output load , but also with Vin/Vout condition, value of L and so on.

    BR

    Gene

  • 0 in reply to Gene Lu
    Intellectual 840 points

    Hi Gene,

    Can you provide formular or equation so that we can know when converter enter power save mode?

    Thank.

    MD

  • 0 in reply to MD Home
    TI__Intellectual 1305 points

    Hi MD,

    The device detects the overshoot of the SW signal over Vout when the PMOS transistor is turned off and the NMOS is turned on. When the overshoot of SW is not large enough, this means the inductor current is nearly to zero, thus the converter enters the power save mode.

    Actually it is really very difficult to use a equation to calculation the exact load condition when it enters power save mode. It is related to the Vin/Vout condition, inductor value, relationship between overshoot voltage and inductor current and so on. But you can refer to the datasheet for a rough range. In Fig.8 and Fig9, the triangle peak Vout means the transition between power save mode and PWM mode.

    Hope this could help you.