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TPA3111D1-Q1: TPA3111D1-Q1 FAULT PIN is always low

user4681182
Intellectual 370 points
Part Number: TPA3111D1-Q1

HI

the schematic of our customer is attached.

the FAULT pin is always low.

do you have any idea to solve that?

  • 0
    TI__Mastermind 19080 points

    Hi,

    An always low voltage on Fault pin may indicate something is detected in abnormal on DC detection and Short Circuit detection. Could you take a try to see the /Fault pin voltage when /SD pin is pulled high?

    For DC detection, you may check if there is any leakage path on Speaker +/-. Please also note that /SD pin should be hold low until input signals are stable during the start up. The matching between input +/- is also important.

    For short circuit protection, you may use a pure resistance connecting between Speaker +/-, and see if the /Fault condition removed.

    Any further question, please let us know. 

    Regards,

    Hao