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TPA3116D2: TPA3116D2

Kailyn Chen
Genius 9560 points
Part Number: TPA3116D2

Hello,

About the input impedance, it describes as this on datasheet 7.3.7 section：

"The impedance seen at the inputs should be limited to an RC time constant of 1ms or less if possible." 

While according to the Table2, the input impedance and the AC couple capacitor  forms the High pass filter, and we can calculate  the RC time constant is about 90ms. So my question is that if is it conflict between 1ms or less  and 90ms? 

Best regards

Kailyn

  • 0
    TI__Mastermind 19650 points

    Hi Kailyn,

    I am sorry I can not load your picture.

    This part description is for input caps charge time. Since when power-up, internal Vbias will charge input DC caps in 10ms.  

    If the input capacitors are not allowed to completely charge, there will be some additional sensitivity to component matching which can result in pop if the input components are not well matched.

    Regards,

    Derek

  • 0 in reply to Yanming Gong
    TI__Genius 9560 points

    Hello Derek,

    I attached the picture again. From this Table 2, we could find that this RC constant time is about 90ms. So does it conflict with less than 1ms as discussed in 7.3.7?

    Best regards

    Kailyn

  • 0 in reply to Kailyn Chen
    TI__Mastermind 19650 points

    Hi Kailyn,

    The 10ms is the DC input caps charge time, not RC circuit.

    You can capture the time using oscilloscope.

    Regards,

    Derek