SLAA901 July   2020  – MONTH  TAS2555 , TAS2557 , TAS2559 , TAS2560 , TAS2562 , TAS2563 , TAS2564 , TAS2764 , TAS2770 , TAS2780 , TAS2781

 

  1. 1Trademarks
  2. 2Introduction
  3. 3Filter Design
    1. 3.1 Filter Cutoff Frequency Selection
    2. 3.2 Capacitance Only Filter Impact on Efficiency
  4. 4References

3 Filter Design

One challenge commonly seen when introducting a filter to a PWM waveform is an increase in the noise floor of the signal. If the filter is not carefully designed, this can increase to levels easily detected by the end user. Generally, it is safe to set the filter corner frequency at or above 2x the effective maximum switching frequency with minimal impact to the noise floor. When designing for devices which utilize post filter feedback (TAS2560, TAS2557, and TAS2559) please refer to Post FilterFeedback Class-D Amplifier Benefits and Design Considerations application report.