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TPA2013D1 - Load Impedance

Hirotaka Matsumoto
Guru 27525 points
Other Parts Discussed in Thread: TPA2013D1

Hi all,

Would you mind if we ask TPA2013D1?

<Question1>
How much is the minimum value of Load Impedance?
The datasheet shows the 4ohm. Is our recognition correct?

<Question2>
When the current Io is over Iol(Output current limit, Boost_max),
what kind of protect the device operate?
(For example: Output Hi-Z )  

Could you let know us?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Mastermind 37045 points

    Hi Hirotaka-san,

    My colleague will work get back to you on this.

    reg,

    Paul.

  • 0 in reply to user5276421
    Guru 27525 points

    Paul san,

    Thank you for your update!
    We are looking forward to your reply!

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Genius 9175 points

    HI Hirotaka,

    1.

    4 ohms is the recommended minimum load impedance and the part performance is specified down to 4 ohms. Lower impedance loads can be run with this part however the spec is not guaranteed. What must be considered is power dissipation within the TPA2013DA based on its efficiency.

    Although higher power levels can be theoretically achieved with a lower impedance load with the same supply voltage, the part may not be able to tolerate the heat generated due to dissipation.

    For example:

    5.5V supply and a 2 ohm load impedance and Rds ON = 2* 0.35. The RMS signal swing = 3.89V RMS. With a total Rds ON of 0.72ohms we have a current of 3.89V/(.72 + 2) = 1.43A. The power loss and dissipation due to the Rds ON will be (1.43A^2) * 0.72 = 1.5W.

    In this case the power dissipation will be 1.5W across Rds on alone.

     

    2.

    At maximum output current, the part will be protected by thermal shutdown if the temperature of the part gets too high. Until overheating the part will begin to clip and show high distortion since the boost converter cannot provide any more current to the load.

    Regards,

    Matt

  • 0 in reply to Matthew Beardsworth
    Guru 27525 points

    Matt san,

    Thank you for your reply and your kindness!
    We got it.

    Kind regards,

    Hirotaka Matsumoto