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TAS5828M: Changing the value of Class D Loop Bandwidth in PPC3

Shunsuke Yamamoto
Expert 5216 points
Part Number: TAS5828M

Hi team, 

What will happen when changing the value of Class D Loop Bandwidth in PPC3?

How does this changing affect switching frequency?

Best regards,

Shunsuke Yamamoto

  • +1
    TI__Genius 14480 points

    Hello Yamamoto-san,

    Refer to TAS5828M Data section 8.3.8.2 Class D Loop Bandwidth and Switching Frequency Setting for guidance on Loop bandwidth setting based on your PWM switching frequency, but here is a basic table on switching frequency and loop bandwidth

    Low High
    Fsw(Switching Frequency)
    • Less switching Loss
    • Larger Inductor for LC Filter
    • Higher switching loss
    • Smaller/Cheaper Inductor for LC filter
    BW(Loop Bandwidth)
    • Worse THD+N due to limited feedback Loop BW
    • Only needs low Fsw
    • Better THD+N due to larger feedback Loop BW
    • Need Higher Fsw which may cause more switching loss

    best regards,
    Luis