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TAS5421-Q1 Protection functions

Vladimir Aparin
Expert 2610 points
Other Parts Discussed in Thread: TAS5421-Q1

In Datasheet fot TAS5421-Q1

DC Detect—This circuit checks for a dc offset continuously during normal operation at the output of the amplifier. If a dc offset occurs, the device asserts the FAULT pin and updates the I2C register. Note that the dc detection threshold follows PVDD changes.

What happends if Vehicle voltage (8-32 V) will be shorted to speaker output?
It will occur bit "In a fault condition" in Status and Load Diagnostic Register (0x02)?

What does it mean "Note that the dc detection threshold follows PVDD changes"?

As i understand SpeakerGuard needed for protect speaker.
How it affect on Status and Load Diagnostic Register?
What happends if Vehicle voltage (8-32 V) will be shorted to speaker output, if I set in Control Register (0x03) bit for "SpeakerGuard protection circuitry set to 5.9-V peak output". Something changes versus SpeakerGuard turned off?
Will speaker output going to Hi-Z state In this case?
Will amplifier working properly after Vehicle voltage will disappear on speaker outputs?
What voltage can appear on PVDD in this case? If PVDD may rise, then how much it can be?

  • 0
    TI__Mastermind 34235 points

    Vladimir,

    One of our colleagues will answer your question soon.

  • 0
    TI__Mastermind 33420 points

    Hello Vladimir,

    1.  The absolute max DC supply on page 3 is 30V.  It will withstand a pulse at 40V for less than or equal to 400mS.  We cannot guarantee shorts at 32V.

    2.  We protect speaker outputs against short to PVDD, GND and output+ to output-.  Output will to to high-z and load diagnostic will be running until the fault is removed.  If you read the fault register, it wil indicate appropriate short condition.

    3.  DC detection threshold (level) will drop as PVDD drops.

    4.  "SpeakerGuard" function is to lower the voltage rail at the output.  It does not affect the Status or LDiagnostics registers.  If your PVDD is 14.4V and you program the SpeakerGuard" to 7V.  Your peak output voltage will be 7V.  It keeps the speaker from getting over 7V signal.  That is all that it does.

    Hope this helps.

    Regards,

    Tuan

     

  • 0 in reply to Tuan
    Expert 2610 points

    Thank you for your answer.

    What can you say about last questions from topic?

    What voltage can appear on PVDD in this case? If PVDD may rise, then how much it can be?

    As I see in scheme on page 10 - PVDD connected to OUTN/OUTP via reverse diodes. If PVDD will be 5V and OUTN or OUTP will be 30 V, TAS5421-Q1going to internal short circuit? Or PVDD will increase?
    How we can protect from this situation?