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TPA6211A1: TPA6211A1 shutdown is broken

Frank Xiao
Genius 12055 points
Part Number: TPA6211A1

Hi team,

My customer is using the TPA6211A now. and The shutdown pin is damaged. The schematic is below. We also test the shutdown pin, the voltage is 5.6v.It's weird the pin voltage is higher than the VDD. So we want to check the internal circuit of the TPA6211A and find the broken reason. Thanks.

BR

Frank

  • 0
    TI__Mastermind 20085 points
    Hello Frank,

    I didn't understand very well, Do they supply 5.6V to the shutdown pin?

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    TI__Genius 12055 points
    Hi Jose,

    sorry for making some mistakes. The condition is:
    1.when they put a higher voltage 5.5v at the +5.0a pin, the pin 1 will rise with the +5.0A pin. When the +5.0A pin voltage higher than 5.6v, the pin 1 will keep 5.5v. i think it's because we have a internal diode from pin 1 to VCC, do you agree?
    2. When the customer do the esd test at the pin 5 and pin 8, the pin1 will be broken and show short circuit to the pin GND. Do you have some ideas about this phenomenon?

    Thanks.
    BR
    Frank
  • 0 in reply to Frank Xiao
    TI__Mastermind 20085 points
    Frank,

    1) It could be possible, but I don't know the internal construction of the device. Therefore, the device should work under recommended operating conditions in order to avoid problems. We can't guarantee the normal operating of the device if you don't follow the given guidelines on the amplifier's datasheet.
    2) It is possible that the device is damaged due to this wrong operating condition.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    TI__Genius 12055 points
    Hi Jose,

    Thanks.
    could you please help check the internal circuit with the IC designer?

    For the esd test, the customer does the 15kv air discharge esd test at the pin V0+ and V0-. So why it broke the PIN1? In our opinion, the VDD should be more easy to be broken. The customer also does the same test with the device they bought one year ago, the chip will not be broken. Does the chip have some difference between with the device now? Thanks.

    BR
    Frank
  • 0 in reply to Frank Xiao
    TI__Mastermind 20085 points
    Hi Frank,

    I'm going to contact someone in order to help us to review the internal circuit. That could take some time, please be patient.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    TI__Mastermind 20085 points
    Hi Frank,

    I noticed that air discharge voltage is outside the datasheet specifications. Therefore, We can't guarantee the device's normal operation if you don't follow the guidelines given in the datasheet. However, you could use a kind of protection like transient voltage suppressors to avoid this issue.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer