• Resolved

TPA6211A1: Abnormal Gain Sample

Guru 20610 points

Replies: 10

Views: 164

Part Number: TPA6211A1

Hi,

My customer is using the TPA6211A1.

Some samples has large gain error in comparison to normal one.

Its abnormal gain is larger than simulation result by TINA-TI, so I suspect spec out.

Please refer the attached files.

TPA6211A.xlsx TPA6211A sim.TSC

Appearing probabillity of abnormal sample is about 1%.

This is caused by not boards but samples, we checked by swapping IC.

Could you investigate about this defect?

Best Regards,

Kuramochi

  • Tadahiko-san,

    My colleague will take a look at this and will answer as soon as possible.

    Best regards,
    Luis Fernando Rodríguez S.

  • Hi Tadahiko-san,

    I'll check if we have faced any similar complaint before with this device.

    From your analysis it seems that internal feedback resistor variation is higher than spec.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • In reply to Ivan Salazar:

    Ivan-san, Luis-san,

    Thank you for your help.

    When can your inform for me?

    Best Regards,

    Kuramochi

  • In reply to Kuramochi Tadahiko:

    Ivan-san, Luis-san,

    How is this progress?

    Best Regards,

    Kuramochi

  • In reply to Kuramochi Tadahiko:

    Kuramochi-san,

    I have confirmed that we haven't received any complaint related to increased gain on this device. That means there is no previous analysis related to it.

    We will review if the spec shown in the data sheet is correct; during my research I found that gain is characterized in V/V with an upper limit of 1.11 and not in terms of the feedback resistance.
    Tolerance of the input resistor must be considered for the gain measurement, perhaps the input resistance in your test is rising the gain for all the tested units.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • In reply to Ivan Salazar:

    Ivan-san,

    Thank you for your information.

    >Tolerance of the input resistor must be considered for the gain measurement, perhaps the input resistance in your test is rising the gain for all the tested units.

    We have checked what it depends on not resistors but IC by swapping the IC.

    >We will review if the spec shown in the data sheet is correct; during my research I found that gain is characterized in V/V with an upper limit of 1.11 and not in terms of the feedback resistance.

    Does it mean that much gain error is occurred by test defect?

    Best Regards,

    Kuramochi

  • In reply to Kuramochi Tadahiko:

    Ivan-san,

    Please let me know if you need the abnormal samples.

    Best Regards,

    Kuramochi

  • In reply to Kuramochi Tadahiko:

    Ivan-san,

    Is there possibility that this is caused by manufacturing process?

    Best Regards,

    Kuramochi

  • In reply to Kuramochi Tadahiko:

    Kuramochi-san,

    We could check the abnormal gain samples, perhaps the ATE can detect if gain is too high, but there is a chance that the results are not abnormal since this should be tested during production.

    Could you please reach out to me at: ivan.salazar@ti.com or provide an email address? I'd like to follow up off-the-forum in order to loop in our CQE to check if ATE can be used to test your units.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • In reply to Ivan Salazar:

    Kuramochi-san,

    We'll handle this through direct email contact.
    I'm closing this e2e thread for now.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators