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TPA6211A1-Q1: TPA6211A1-Q1 : How to consider thermal design

Ryuuichi machida
Guru 12695 points
Part Number: TPA6211A1-Q1
Other Parts Discussed in Thread: TAS5411-Q1

Hi,

I want you to confirm how user calculate allowable power dissipation.

According to datasheet of TPA6211A1-Q1, Maximum ambient temperature is defined as "Equation 12" of datasheet.

However, "Rθja" is used in this equation. Recently, I believe that user should not use "Rθja" to consider thermal design as shown "spra953c.pdf" by basic stance of TI.

www.ti.com/.../spra953c.pdf

In this case, Should we consider thermal design in accordance with "spra953c.pdf" not "Equation 12" of datasheet ?

Best Regards,

Machida

 

  • 0
    TI__Mastermind 20085 points
    Hi Machida-san,

    In this case, you should consider the Application Report instead of "equation 12" of the datasheet. As It is explained in the Application Report the RθJA depends on other system level characteristics such as the design and layout of the printed circuit board (PCB) on which the part is mounted.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    Guru 12695 points
    Hi Jose-san,

    Thank you for your reply.
    >In this case, you should consider the Application Report instead of "equation 12" of the datasheet.
    If possible,could you please add this application note to "technical document" of each production page ?
    I also discussed about this for TAS5411-Q1 as well. I think that this application note should be used for audio amp production which is used "Rθja" to estimate thermal design.

    Best Regards,
    Machida
  • 0 in reply to Ryuuichi machida
    TI__Mastermind 20085 points
    Hi Machida-san

    I'm going to review if we can add this application note to the technical documents. On the other hand, there is a reference to this application report on each datasheet under the thermal information section.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer