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TPS65132: issue

Ivy Jin
Intellectual 2365 points
Part Number: TPS65132

Hi team,

My customer use TPS65132 in their project, now they meet below issue, could you help give some suggestions? Thank you!

Customers are experiencing an issue with the open gesture standby current increase exceed when using the TPS65132.
TPS65132 increase: 2.2 mA
OCP2131B increase: 1.7 mA
Both ICs operate PFM mode after gesture standby is turned on, the difference between the SW waveform is as follows: The TPS65132 will charge twice, and the OCS2131B will only have one charge. The datasheet of TPS65132 also shows a single charge.

Below are the schematic and PCB.

Regards,

Ivy

  • 0
    TI__Mastermind 18550 points

    Hello,

    Thank you for your post. I should be able to review it and feedback to you by tomorrow and that you for your patience.

    Kind Regards,

    Liaqat

  • 0 in reply to Liaqat Khan
    TI__Mastermind 18550 points

    Hello Ivy,

    I reviewed the schematics and layout of the design and it looks correct. How many switching cycle will the TPS65132 have in PFM mode will depend on any load/leakage current, boost input voltage and output voltage. With Vin=3.4V, VPOS=5.4V , VNEG=-5.4V and without any load current on the negative/positive rails, typical input current I measured on a TPS65132EVM is 1.4mA. Can customer measure under the same conditions and report the input current? Which exact flavor of TPS65132 is customer using (TPS65132S?, TPS65132A0? etc.)

    Kind Regards,

    Liaqat

  • 0 in reply to Liaqat Khan
    TI__Intellectual 2365 points

    Hi Liagat,

    Thanks for your reply!

    The part number is TPS65132A0YFFR.

    The customer's application is smart phone, when Vin=3.4V. the phone is in turned off status, so the customer feedback they can't test the input current as your said.

    The test condition when the abnormal waveform occurs: Vin=4V，VPOS=6.0V , VNEG=-6.0V， load current is about 1~2mA.
    Could you please help give some suggestions?

    Thank you!

    Regards,

    Ivy

  • 0 in reply to Ivy Jin
    TI__Mastermind 18550 points

    Hi Ivy,

    With the customer application conditions you mentioned, the current that customer is measuring with TPS65132A0 is within the expected range so I do not think there is anything wrong and I am not sure what else we can do.

    Kind Regards,

    Liaqat

  • 0 in reply to Liaqat Khan
    TI__Intellectual 2365 points

    Hi Liaqat，

    Thanks for your comments.

    May I know why below waveform have two pluses?

    The customer expected a maximum current of 2mA, but the actual test value was 2.2mA, which was more than 0.2mA.

    Could you please help give some comments?

    Thank you.

    Regards，

    Ivy

  • 0 in reply to Ivy Jin
    TI__Mastermind 18550 points

    Hi Ivy,

    As I tried to explain in the earlier response, number of switching pulses in the burst depends on the load current, input voltage and output voltage. With the input/output voltages and load conditions you mentioned, having two switching pulses is not abnormal. Customer can remove the 2mA load and the number of pulses in the switching burst will likely go down to one.

    Kind Regards,

    Liaqat

  • 0 in reply to Liaqat Khan
    Prodigy 30 points

    Hi Liaqat,

    I'm Lvy's customer,  i agree with you that number of switching pulses in the burst depends on the load current, input voltage and output voltage.,and we had remove the 2mA load and the number of pulses in switching burst will have one or two, It comes up randomly;  i retry add 2mA load test, number of pulses is same as no load. Sometimes it's one, sometimes it's two。i think this is reason why tp65132's  power consumption is larger than OCP2131B.

    so, plz help us to calify that is it normal?

  • 0 in reply to ZHAO TAO
    TI__Mastermind 18550 points

    Hi Zhao,

    Thank you for the feedback. In your schematics, you are using a 2.2uH inductor for boost converter and recommended value is 4.7uH inductor. You can try  changing this inductor to a 4.7uH to see if it improves the behavior? If it does not, there is not, much else we can do to reduce the power consumption. I had already reviewed your schematics/layout and the rest of it looks good.

    Kind Regards,

    Liaqat

  • 0 in reply to Liaqat Khan
    Prodigy 30 points

    Hi Liaqat,

    Thank for you reply,  i had tryed use 4.7uH inductor for  power consumption verify and  SW wafes test, it is same as 2.2uH.  could you provide TP65132 no load's power consumption for our reference?

  • 0 in reply to ZHAO TAO
    TI__Mastermind 18550 points

    Hi Zhao,

    I do not have measured data for TPS65132B but I do have it for TPS65132A which should be similar between the two devices. Below is the no load data.

    TPS65132A

    Vin (V)

    VPOS (V)

    VNEG (V)

    Iin (mA)

    3.4

    5.4

    -5.4

    1.32

    4.3

    5.4

    5.4

    1.08

    Kind Regards,

    Liaqat

  • 0 in reply to Liaqat Khan
    Prodigy 30 points

    Hi Liaqat,

               thanks for your data, we did used TPS65132A, but our application is VPOS=6V VNEG=-6V,  could you also provide this satuation for our reference?

            

  • 0 in reply to ZHAO TAO
    TI__Mastermind 18550 points

    Hi Zhao,

    I do not have data at +/-6V and, unfortunately, do not have a EVM handy to measure it but you can program your TPS65132A or B EVM to +/-5.4V and compare results. The difference between my measured values at +/-5.4V and your measured value at +/-5.4V should approx. carry over to your measured value at +/-6V.

    Kind Regards,

    Liaqat