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TPA3110D2-Q1 EMI suppression and Thermal consideration

NOBUO FUJIHARA
Genius 9405 points
Other Parts Discussed in Thread: TPA3110D2-Q1

Hi champs,

My customer asked following questions regarding to TPA3110D2-Q1.

Can you confirm below?

 

(1) EMI suppression

Should Beads filter (or inductor) and capacitor be placed closed to output port of the device?

 

(2) Theta Ja

Described Thita-ja is based on JESD51-7 High Thermal Conductivity Leaded SMT test Board?

 

Best Regards,

Nobuo Fujihara

  • 0
    TI__Guru 57800 points

    Hi, Fujihara-san,

    I have asked my colleague to take a look to your questions. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0
    TI__Mastermind 23810 points
    Fujihara-san,

    1.) Yes, the ferrite beads or inductor and capacitor should be placed close to the output port of the device.
    - The switching node should be kept small. The high current traces should be kept wide, but the distance between the OUTx pins and the inductor/ferrite bead should be short.
    - the return loop for the switching noise back to ground (through the capacitor) should be kept to a tight loop.
    - the layout is discussed at the end of the datasheet.

    2.) R_Theta_JA is simulated. You have probably already read it, but this app note explains the thermal metrics pretty well:

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