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TAS5624A Behavior of FAULT Pin for Non-input PWM

Sadanori Kato
Guru 36490 points
Other Parts Discussed in Thread: TAS5624A

Hi,

Could you please tell us the behavior of FAULT pin for the non-input pwm ?
We believe that the FAULT pin is not asserted to low if the input pwm is lost since there is mentioned on page 18 of the data sheet as below.
However, the FAULT pin is asserted to low or  kept high.
Could you please tell us that reason ?

Best Regards,
Kato

  • 0
    TI__Guru**** 189399 points
    Hi, Kato-san,

    You are correct, no PWM does not cause the FAULT-z pin to change state.

    Basically, the output transistors are all turned off (resulting in a high output impedance from the amplifier) until a valid PWM signal is applied. At that time, it will start switching.

    -d2
  • 0 in reply to Don Dapkus
    Guru 36490 points

    Hi Don-san,

    Thank you for your reply.
    The FAULT pin was asserted to low at the timing that the input pwm was lost in the operation when our customer have evaluated TAS5624A.
    However, that phenomenon does not always occur.
    How should I think about that phenomenon?
    Could you please give me your advice?

    Best Regards,
    Kato

  • 0 in reply to Sadanori Kato
    TI__Intellectual 1560 points
    Kato-san,
    Stuck at Fault (input PWM either stopped or at too low frequency) should not be able to assert /FAULT regardless of number of channels affected, so I suspect other mechanisms to be causing the observed FAULT signal.
    If the device /RESET pin is controlled from the PWM modulator, this node will go low when the PWM modulator stops activity.
    Can you post more detail of the system wiht the FAULT low signal? This will be very useful for further debugging.
    Thanks!
  • 0 in reply to sorenpoulsen
    Guru 36490 points

    Hi Soren-san,

    Thank you for your response.
    The simple capture of the oscilloscope is shown as below, our customer is continuing the investigation of that phenomenon.
    Could you please give me your advice regarding that behavior of the FAULT pin for non-input pwm?

    Best Regards,
    Kato