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TAS6424EQ1EVM: DC Detect

Rodrigo cordero palomares
Prodigy 30 points
Part Number: TAS6424EQ1EVM


Tool/software:

Hi all,

      I've an amplifier which use internally TAS6424Q1 & I'm using it into my laboratory for experiments.
      Sometimes when I get high power output (VCC 15Vdc /// around 16watt output per channel  /// Input Sine wave 1khz +20dB full scale /// 4ohms each CH) I noticed that .....
           1) TAS6424Q1 goes to shutdown suddenly detecting DC Detect Error flag (I found that there is not proper physical contact between thermal Pad & Heat-Sink)
                So, my question is, how come the first Error detected is "DC Detect" fault instead of Over-Thermal? 
                As I mentioned, it happened only at high power output.

           2). Sometimes it not fully shutdown; I means, only activate DC Detect flag but TAS6424Q1 still playing sound.

   

     I have an EVM module (TAS6424Q1 EVM) & I can replicate the same symptom for 1) playing the EVM without Heat-sink; however, can't replicate 2).

  I do appreciate your advice on above questions
      

  • 0
    TI__Guru 51620 points

    Hi Rodrigo

      It's quite strange behavior, don't have a very good answer for now. May need to do more testing to debug.

    Rodrigo cordero palomares said:
    1) TAS6424Q1 goes to shutdown suddenly detecting DC Detect Error flag (I found that there is not proper physical contact between thermal Pad & Heat-Sink)

    Some question about this phenomenon:

    1. The relationship between the heatsink, is it strong enough? For example, if you make sure heatsink contact very well, this phenomenon will never happen again?

    2. We could check the output waveform, to see if anything related with the DC detect. If the output is clipping too much, device may think  you are creating a DC at the output side.