SLOA339 July   2024 TAS2764 , TAS2764 , TAS2780 , TAS2780 , TAS2781 , TAS2781

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Capacitor Only Connected at the Class-D Outputs
    2. 1.2 LC Filter Connected at the Class-D Outputs
    3. 1.3 Ferrite Bead Filters
  5. 2EMI Filter Considerations
    1. 2.1 Impedance Consideration of EMI Filter
    2. 2.2 Device Reliability Constraint for High Output Voltage
    3. 2.3 EMI Filter Current Reliability
  6. 3Post Filter Feedback
  7. 4Loop Stability With Post Filter Feedback
  8. 5User Guide: EMI Filter Modeling and Post Filter Feedback Validation Tool
  9. 6Summary
  10. 7References

2.3 EMI Filter Current Reliability

When selecting an EMI filter or ferrite bead make sure that the component is rated for the maximum load current through the speaker. For instance, in TAS2780, 81 devices the peak speaker current can be as high as 4A and RMS current of 2.8A, while in TAS2764 the device RMS current can be order of 2A. Hence the bead must be chosen appropriately to make sure reliability and avoid significant de-rating. For example 2506036017Y2 bead is rated for maximum 2A current hence are not appropriate to use high power applications