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TLV61048: TLV61048DBVR

Rock Shao
Expert 2995 points
Part Number: TLV61048

Hi 

TLV61048DBVR output voltage should be 9.7V, but the only 8.xV on the failing part.

It has been confirmed that the customer’s voltage feedback resistor (R1, R7) uses 1% of the material.

The FB PIN with NG sample is 0.687V, which is under SPEC and the output voltage is lower than good IC.

Please help to check it's OK or not, thanks.

NG IC

GOOD IC

Regards

Rock

  • 0
    TI__Mastermind 34231 points

    Hi Rock,

    Could you share the layout of the board?

    And I have several questions for you:

    1. What's the failure rate now? How many failure parts have you met?

    2. Have you tried replaced a good IC and failure IC and test again?

    3. What's the input voltage, load current for these two waveform? Will the output voltage keep constant at 8.xV with higher load current?

  • 0 in reply to Zack Liu
    Expert 2995 points

    Hi Zack,

    Could you share the layout of the board?
    →I will ask the customer if they can share the PCB layout, but the Customer had check A-B-A swap, the low voltage conditions will follow NG ICs with the same PCBA.

    1. What's the failure rate now? How many failure parts have you met?
    → failure rate 7/40(175000 ppm), 7pcs of 40pcs test found that the output voltage is too low,

    2. Have you tried replaced a good IC and failure IC and test again?
    → replaced good IC and failure IC in the same PCB, you can refer to the waveform above that is A-B-A swap test result.

    3. What's the input voltage, load current for these two waveforms? Will the output voltage keep constant at 8.xV with a higher load current?
    → Vin=5Vdc, Vout_nom=9.7V, Iout=1A. The customer didn't test the higher load current.

    Regards

    Rock

  • 0 in reply to Rock Shao
    TI__Mastermind 34231 points

    Hi Rock,

    I'll send you a friendship request.

    You can share the layout to me through email.

  • 0 in reply to Zack Liu
    Expert 2995 points

    Hi Zack,

    I have a question, from the current situation, the layout will not affect this issue. Why do you need to confirm the layout?

    According to the results of the A-B-A exchange, the layout will not affect the test results of the good/NG IC.

    It seems that the voltage of the FB pin affects the output voltage. Did you have any thoughts on this issue?

    Whether it is recommended to perform FA analysis.

    Regards

    Rock

  • 0 in reply to Rock Shao
    TI__Mastermind 34231 points

    Hi Rock,

    We would like to check the schematic and layout are all good first. All devices should pass ATE test from factory. There is possibility that the part of devices failed during working. So we usually will check customer use TI device correctly.

  • 0 in reply to Zack Liu
    Expert 2995 points

    Hi Zack,

    I have sent the layout for you, please help to check that, thanks.

    regards

    Rock