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LM3886, temperature rise is increased, which characteristic has changed at the long term test?

Shinichi Inoue
Guru 21721 points
Other Parts Discussed in Thread: LM3886

Dear Specialists,

My customer is evaluating LM3886.

After the test of long term test, temperature rise is increased.

He anticipated that output impedance is increased, output transistor HFE is decreased.

Is it correct?

Are there other reason?

Could you please advise which characteristic has changed.

---the customer use case---

Vcc: +24V, Vee: -24V

Supply current: 5.8Arms

Load resistance: 2.7ohm

-----

I appreciate your great help.

Best regards,

Shinichi

  • 0
    TI__Mastermind 20085 points
    Hi Shinichi

    I'm researching about this now. I'll come back to you as soon as possible with the information.

    Best regards
    José Luis Figueroa de Lara
    Audio Applications Engineer
    Texas Instruments
  • 0 in reply to José Luis
    TI__Mastermind 20085 points

    Hi Shinichi

    That is correct, output impedance will increase because the impedance of an IC changes with the temperature variation. Also the input impedance will change by the same reason. This condition happens because the resistors and capacitors into the IC are affected for the temperature changing.

    Please let me know your opinion or if you have more questions. 

    Best regards
    José Luis Figueroa de Lara                                                                                                           
    Audio Applications Engineer
    Texas Instruments

  • 0 in reply to José Luis
    Guru 21721 points

    Dear Jose

    Thank you for your reply.

    I understand the device was increased the input impedance and output impedance.

    I'll feedback the answer to the customer.

    If additional question is come, could you please advise.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi