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TPA2017D2: tolerance for short circuit on the output terminal

Kazuto Tatsumi
Intellectual 2820 points
Part Number: TPA2017D2
Other Parts Discussed in Thread: TPA2016D2Hi team,

My customer has a question about the short circuit tolerance on the output terminals of TPA2017D2.

The resistance between the each output terminal to GND is 10 - 60 ohm, it seems the internal FET was destroyed after the short circuit test that the output terminals (OUT+ and OUT-) are shorted and the sound is applied for several times.

Can the thermal protection of TPS2017D2 protect himself in this kind of situation? Is it intolerable for him?

Best Regards,
Kazuto
  • 0
    TI__Guru* 84915 points

    Tasumi-san,

    The protection current for the TPA2017D2 is around 1.5A. This protection is purposed as short-circuit and not over-current protection. The threshold variation should be considered.

    In case of the thermal protection, it can protect the circuit just when the junction temperature surpasses 150°C to prevent damage to the IC. If the short circuit issue reaches this thermal value, the TPA2017D2 will enter in a protection state.

    I hope this makes sense. Please let me know if you have additional questions or comments on this.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 230 points

    This is Tatsumi-san's customer.

    Is the short-circuit protector which you mentioned supposing AC current?

    If the differencial outputs are connected each other, 5V-300kHz square wave current must flow directly.

    Or if the protector can detect only "to GND" current, it cannot detect the current which I mentioned above.

    Best regards,

    Atsushi HANZAWA (SHARP corporation)

  • 0 in reply to user3555915
    TI__Guru* 84915 points

    Hi, Hanzawa-san,

    I apologize for my late response.

    The short-circuit protection applies to both AC and DC current. It is not dependent of the GND current. This current protection is actually enabled once the current threshold (approximately 1.5A) is surpassed.

    Even if the differential outputs are connected each other, the 5V-300KHz square wave must generate a current protection.

    Please let me know if you have further questions or comments on this.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 230 points

    Actually we'll replace TPA2017D2 with TPA2016D2 in our project, and I have a question of TPA2016D2. I'll create a new question thread.

    Best regards,

    Atsushi HANZAWA (Sharp Corporation)