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TPA2080D1: TPA2080D behaviour on switching inductor failure

Prodigy 20 points

Replies: 4

Views: 27

Part Number: TPA2080D1

Hello,

What would happen if the switching inductor (2.2uH in the application schematic of the datasheet, fig 24) were to fail or if it was not soldered at all? Would the TPA2080 be in an unstable state with potentially a high current consumption as a side effect?

Best regards,

G. Brun

  • Hi, Brun,

    Welcome to E2E and thank you for your interest in our products!

    We will take a look at this and will answer as soon as possible.

    Best regards,
    Luis Fernando Rodríguez S.

  • Hi G,

    Your assumption is correct, if you use the device without the boost inductor you could drive +5V to the PVDD pin.
    Internally, the boost converter will continue to run and the device idle current will be a little higher.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuator

  • In reply to Ivan Salazar:

    Hello,

    Thanks for your answer. I am also interested in the opposite case, i.e. if the failure leads to an open circuit in place of the inductor. What would happen in that case (or any related issue where the SW pin is left floating)?

    Best regards,

    Geoffrey Brun

  • In reply to Brun Geoffrey:

    Geoffrey,

    Let me clarify, if boost inductor suddenly became either short or open circuit, the device functionality would not be ideal:

    • Sudden open circuit on boost inductor would disable the output completely because there would be no voltage at PVDD
    • Sudden short circuit on boost inductor could keep output operating, although at lower voltage. This needs to be tested and its performance its not guaranteed.

    My previous comment was considering if you wanted to operate TPA2080D1 without the boost inductor, you can do this by placing open circuit instead of boost inductor, and supply external voltage directly to PVDD pin.

     Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuator