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TPA3126D2: Replaced TPA3116D2 with TPA3126D2

?? ?
Prodigy 45 points
Part Number: TPA3126D2
Other Parts Discussed in Thread: TPA3116D2

Hello everyone

I wrote it in Japanese for the first time, but I will ask again in English.
I am also testing by replacing TPA3116D2 with TPA3126D2.
The TPA3116D2 operates continuously with a sine wave 4Ω 40W stereo, but the TPA3126D2 operates intermittently in about 2 minutes.
The maximum temperature of the IC heat sink is 143 ° C for TPA3116D2, but intermittent operation occurs at about 65 ° C for TPA3126D2.
It operates continuously when air is blown to the heat sink.
Is there a difference in thermal performance between the two ICs?
I thought it could be replaced simply, but is it impossible?
I've only tried one, so I'm going to try more than one.
Please let me know if you have any information.

  • 0
    TI__Genius 14810 points

    Hi 

    For TPA3126D2 has a lower Rds than TPA3116.

    So that the output peak voltage would be a little higher than TPA3116.

    Maybe not the OT problem, it is an OC issue, so you can take a try an Inductor with higher Isat and Itemp.

    thanks.

    Jesse

  • 0 in reply to Jesse Ji
    Prodigy 45 points

    Jesse
    Thank you for your reply.

    Is the cause over current?
    If you blow air to the heat sink, it will continue to operate, so it seems that Over temperature is the cause, but how about it?

    There are some terms I don't understand.
    What are Isat and Itemp?
    Is there a problem with the characteristics of the output LC filter?
    Please tell me.

    I look forward to working with you.

  • 0 in reply to ?? ?
    TI__Genius 14810 points

    Hi

    Isat describes the inductance value loss with the current increase.

    Itemp describes the inductance value loss with the temperature increase, some times it is also named Irms.

    When temperature increase, inductance decrease so that the ripple current increase, then the OCP maybe triggered.

    so when you using blow air to cool the heatsink, the inductor temperature may also been cool down so that the inductance will not decease too much.

    then the OC will be triggered hardly.

    you can take a try inductor with Isat larger than OCthres.

    thanks.

    Jesse

  • 0 in reply to Jesse Ji
    Prodigy 45 points

    Jesse
    Thank you for your reply.

    It is an indicator of inductor performance.
    The inductor used is 7G13C-100M from sagami-elec.co.jp.
    ⇒www.sagami-elec.co.jp/.../08D-AMP_7g.pdf

    Temperature rise allowable current is 6A.
    Since OCthres is 7.5A, it seems necessary to try a higher performance inductor.

    I tested the other board with the TPA3126D2 and it worked continuously.
    Since there are two more boards, I will replace it with TPA3126D2 and try it.

    Sorry for the strange English because it is an automatic translation.
    Best Regards,
    Hiroshi

    PS: I can't change my sign-in name.