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TPA3112D1-Q1: INP

Ivy Jin
Expert 5845 points

Part Number: TPA3112D1-Q1

Tool/software:

Hi team,

Could you please share your suggestions for the following question? Thanks!

1.May I ask if the design of the INP input circuit part(R37/R38) in the following schematic is reasonable? The left is the voice chip 

2.The customer has found in the test that the fault pin has an error (measured as 0V) after disconnecting R37. When the TPA3112D1-Q1 is powered on again and R37 is connected, normal operation is not restored. May I ask the potential reasons? 

Regards,

Ivy

  • 0
    TI__Guru 55930 points

    Hi Ivy

    Ivy Jin said:
    1.May I ask if the design of the INP input circuit part(R37/R38) in the following schematic is reasonable? The left is the voice chip 

    Doesn't seems to create trouble. With R38 1Mohm, almost no effect for this resistor network. Maybe customer want to reserve place to further adjust input signal level.0

    Ivy Jin said:
    2.The customer has found in the test that the fault pin has an error (measured as 0V) after disconnecting R37. When the TPA3112D1-Q1 is powered on again and R37 is connected, normal operation is not restored. May I ask the potential reasons? 

    R37 shouldn't have any connection with Fault. And since the IC didn't recover after R37 is back, it means there's something else changed. Possibly some other circuit affected when they try to remove resistor.

    Need to check the surrounding devices, especially the capacitors at Input, BST, GVDD. Also check if any shortage happened, like the IC pins.