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TAS5342 Analog PWM input

Other Parts Discussed in Thread: TAS5342, TAS5342A

Hi,

I am using the TAS5342a in SE mode to amplify an analog PWM input. I am using only one of the four available channels. At the output of the TAS5342 I only get a DC voltage which is exactly the same as the GVDD voltage, and when I decrease the GVDD voltage below 9.5V (aprox) the output voltage of the TAS5342 it is always 9.5V. Any idea about which could be the problem?

I am following the reference design of the datasheet for Typical SE applictions. 

Thank you very much in advance

  • Hi, Kevin,

    Sorry that you are having trouble. I don't understand what you mean by "analog PWM" signal. Is this signal within the voltage and frequency limits of the TAS5342A?

    -d2
  • Sorry, I probably didn't explain well myself. 

    What I meant is that the PWM is generated with op-amps (comparator and a carrier signal from a trigger-schmitt) insted of a PWM processor, as recommended in the refernce design.

    Today I have been checking again my set-up and I think the IC may be burned, but I would like to be sure. At the output of the PWM I always get the 9.6V, even if there is not PVDD source and at the BST_C pin I get 11.8V. I have set the PWM input to zero, changing reset high to low and viceversa and the voltage at this pins always remain the same.

    The PWM I obtain has an amplitude of 3.8V and a frequency of 260kHz, so it is within the limits.

     

  • Hi, Kevin,

    Sorry for the delay. You may want to talk to some other people locally about what is going on. There are many variables that may be responsible for this failure mode.

    -d2