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TPS63000: HIgh current consume while no load

Peter Tseng
Genius 5910 points
Part Number: TPS63000
Other Parts Discussed in Thread: TEST2

Hi Team,

My customer found the TPS63000 consume 1x mA with no load.

Please give me some comments about this issue!

Attached are the schematics and layout.

Thanks.

3.3to5V.zip

  • 0
    TI__Mastermind 25840 points

    Hi  Peter,

    Since PS pin is connected to Vin, device work in FPWM mode. High consumption is make sense even without load.

    Regards

    Tao

  • 0 in reply to Tao Zhang
    Genius 5910 points

    Hi Tao,

    I still have a question about it!

    Even working in FPWM mode, the 15mA is reasonable or not?

    And here are some test results from the customer.

    Test1:

    no Vin, no load, direct provide 5V from TP201(VDD_5V). 

    Read current from meter: 0.66mA for 5V input.

    Test2:

    Vin=3V, Vout=VDD_5V, no load. 

    read input current from meter: 15.48mA.

    The scope shows the VDD_5V waveform.

    Test3:

    Vin=3V, Vout=VDD_5V, no load.

    Read input current from DC power source =0.16A, Meter show the Vin is 3V.

    The scope shows waveforms of Ch1(VFB) and CH3(VDD_5V)

    Both of them are sine waveform. Is it normal?

    According to those tests, is there any idea about the high current issue for no load?

    Please help to comments.

    Thanks.

    TPS63000 test.pdf

  • 0 in reply to Peter Tseng
    TI__Mastermind 25840 points

    Hi  Peter,

    15mA input current with no load is reasonable in FPWM mode.

    But the behavior in test3 is unexpected, seems some noise coupled into FB by probe. i am nor sure.

    Regards

    Tao