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TAS5431-Q1: remind overcurrent shutdown

LIN QI
Prodigy 10 points
Part Number: TAS5431-Q1

I have designed in the  TAS5431QPWPRQ1 to drive a speaker which DRC is 4Ω. When I power on the circuit, the TAS5431-Q1 can not work . I can read the Fault Register
(0x01) is 0x08. Then I changed the load to 16Ω，but it stil remind 0x08. I'm sure the output didn't short. Could you help me to analyse this problem? Thank you.

  • 0
    TI__Mastermind 32100 points

    Hi Lin

      It's a little interesting that only OC reported, but load diag passed. I think the OC happened as soon as power up, not during output large power, it may not related with your load so much.

      Shall we have a look at the schematic first? 

  • 0 in reply to Shadow He
    Prodigy 10 points

    Hi Shadow,

    Here is the sch. I  try to move the 49.9K before the 22uf, but the issue still exist.

    Through reading the Fault Register: (0x01) is 0x08, (0x02) is 0x20, (0x03) is 0x78.

    I did an experiment, I removed the C8038 and C8037, and then powered up the circuit, the issue still existed.

  • 0 in reply to LIN QI
    TI__Mastermind 32100 points

    Hi Lin

      It should be the LC filter causing the trouble. 3.3uH is too small for this device,  please have a try with 22uH inductor. Or simply remove C8017 and C8025 to have a try.

  • 0 in reply to Shadow He
    Prodigy 10 points

    Hi Shadow，

    After I removed C8018 and C8025, the issue is resolved. I think the reason is that I reduced the value of inductance，but I neglected the capacitance.

    Thank you!