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Original question:

TAS2770EVM: PWM output for 1KHz input

TAS2770EVM: TAS2770 -H-Bridge output to speaker emission

Shubham Jagtap2
Intellectual 280 points
Part Number: TAS2770EVM
Other Parts Discussed in Thread: TAS2770

Hello Concern,

In datasheet, It is stated that 'the H-bridges in the device and the connections to the speakers as tight as possible to reduce emissions'.

But in our case Speaker to Hbridge (TAS2770) distance is about 2Mtr. TI also stated that maximum loading on the output cable is 20nF after the filter.

So what will be the consequences for 2Mtr long cable and how to measure the capacitive loading on cable.

Is there any solution for reduce the emission over the cable.

Kind Regards,

Shubham Jagtap

  • 0
    TI__Intellectual 865 points

    Hello Shubham Jagtap,

    Welcome to E2E. Thank you for your interest in TAS2770. Regarding on possible solution to reduce emission on long cables, We recommend, in stead of ferrite filter, implement a low pass filter(e.g 25 kHZ corner frequency) at the output for the cable to filter out the high switching frequencies. 

    For your second question, may I ask where did you read about the 20nF limitation for the output cable? I have not been able to find it on the data sheet. From what I have gathered from other engineers, the output capacitance should not be an issue in most cases. Let me know if you have anymore questions

    Regards,

    Jin Gao

  • 0 in reply to Jin Gao
    TI__Intellectual 865 points

    Hello Shubham Jagtap,

    Thank you for contacting us on E2E. I'm closing this E2E thread due to the inactivity. However, please feel free to post your questions or comments in case of additional observations.

    Regards,

    Jin Gao

  • 0 in reply to Jin Gao
    Intellectual 280 points

    Hello Jin,

    Thanks for solution, TI not stated specific 20nF but find the below reference.

    Yes, we can use low pass filter.