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TPS63000: How to use VINA and Power saving mode

user6526564
Prodigy 20 points
Part Number: TPS63000

Hi support team.

I have 2 questions.

Q1: I want to shut down a circuit when the battery voltage (VIN) is lower than the target value which higer than the under voltage lockout threshold.   

       In  this case,  is it correct way that supplying the voltage to VINA pin via a voltage divider circuit ?

       e.g. Is there any probrem using a voltage dividercircuit 2 resisitors with same value, when the shut down target voltage is 3.4V and connect the center to the VINA pin. 

              (The typical under voltage lockout threshold is 1.7V.

Q2: I found an article which said "When we use the ower save mode, the response speed to the load change is slow."

      How slow it will be?

I would appreciate it if you could reply.

Best regards,

K,Kamada

  • 0
    TI__Expert 4760 points

    Hi Kamada,

    A1: Supplying the voltage to VINA pin via a voltage divider circuit is not a correct way. If you want to use low voltage protection, you can add a comparator to monitor the battery voltage, the output pin of comparator is connected to EN pin. When Vbat is large enough the EN pin is high, otherwise the EN pin is low to shut down the device.

    A2: The response speed is not slow as you say. I tested load step response at the same condition for both PSM and FPWM. CH1 is output voltage, Ch3 is output current. Test condition: Vi=3V, Vo=3.3V, Io=100mA to 600mA.

    FPWM:

    PSM:

    Best Regards,

    Yichen Xu

  • 0
    TI__Expert 4760 points

    Hi Kamada,

    Is there any update?

    Best Regards,

    Yichen Xu

  • 0
    TI__Expert 4760 points

    Hi Kamada,

    Long time no hearing from you. I think you have solved this. If not, feel free to contact us.

    Best Regards,

    Yichen

  • 0 in reply to Yichen Xu
    Prodigy 20 points

    Hi, Yichen

    Sorry for being late to reply and thank you for answering my questions.

    Your reply was very usefull.

    I tested with an evaluation board and confirmed the response speed was not slow as you said,

    Best Regards,

    K,Kamada