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  • TI Thinks Resolved

TPA3110D2-Q1: how to think about short circuit protection

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Replies: 3

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Part Number: TPA3110D2-Q1

Dear all,

Could you teach me how to think about short circuit protection?

>Question 1,

Can we define the short circuit protection as current value?

I think that this short circuit protection is defined as energy amount. So I think this protection can not be defined by current value.

>Question 2,

And, when I compare BTL mode and PBTL mode, will the current through output cable at PBTL mode be twice larger than BTL mode because output pin is connected parallel?

Best regards,

  • Hello Yamamoto-san, I think this question directly relates to your last question that I responded to. The TPA3110 has the Speakerguard feature, though it is fairly simple, as an older device, and is likely not the type of protection that you are thinking about. Please take a look at one of our newer devices like the TPA3116: www.ti.com/.../TPA3116D2-Q1 , which does have full protection with specified Overcurrent specs. Also, the TAS5760 (digital input) will also be released as an AECQ100 part, in case that interests you. Thanks, Jeff
  • Hi Yamamoto-san,
    I'm trying to answer your queestion as below:
    Question 1,
    Can we define the short circuit protection as current value? [Shawn] No, the OC THR is fixed inside the device, so it's not programmable for customers.
    I think that this short circuit protection is defined as energy amount. So I think this protection can not be defined by current value. [Shawn] OC feature is actually used to protect the device instead of the speaker. When the output is short, the output current could be very high, which probably damages the MOSFET.

    >Question 2,

    And, when I compare BTL mode and PBTL mode, will the current through output cable at PBTL mode be twice larger than BTL mode because output pin is connected parallel? [Shawn] In the same case(the same power supply, output power and load resistance), the output current for BTL is twice of PBTL. Because in PBTL mode, the output current is devided into two parts.

    Best regards,
    Shawn Zheng
  • In reply to Shawn Zheng:

    Hi Yamamoto-san,
    Could you please close this question if it's answered? Please let us know if you have more question.
    Best regards,
    Shawn Zheng

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