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The power output of TP65150 is not step-up

wells zhu
Prodigy 235 points
Other Parts Discussed in Thread: TPS65160, TPS65150

Hi experts,

In our product, we use TPS65160 to get Vs,VGH,VGL,VCOM. The power input of TP65160 is a 3.6V DC power supply. 

The 3.6V power supply is controlled by a power switch.

In our application, the 3.6V power supply is sometimes disabled and then enabled.

Sometimes, after the 3.6v power supply is on, the Vs voltage of TPS65150 is equal to that of input power supply.

The schematics we use are same as that on datasheet of TPS65150.

Why does TPS65150 not work?

  • 0
    TI__Guru 59715 points

    Hello Wells,

    The part you are using is TPS65150, correct? There are 3 application diagrams in the datasheet, Figures 21 to 24. I expect you are speaking about Figure 21, correct? Is your schematic exactly the same as this one or are there some differences?

    Is just the boost converter not operating or are all output voltages off? Please check if the fault delay is too short for your application.

    Does the part not start at all or does it try to start and stops again after a short time. Please send an oscilloscope plot of the outputs during startup when the part starts properly as well as when the part does not start.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    Prodigy 235 points

    Hi Brigitte,

    Thank you for your kind reply.

    The schematics I use is shown in the attached file. 

    When TPS65150 don't work, all the output voltages are not that are set. For example, Vs is near input power supply voltage. VGH is lower than Vs. 

    I will follow your suggestion to check whether the fault delay is ok. 

    Thank you very much.

    5127.SCHEMATIC1_02-Power.pdf

  • 0 in reply to Brigitte
    Prodigy 235 points

    Hi Brigitte,

    You are right. The fault delay is too short for my application. After I change the fault delay, problem is solved.

    Thank you very much.