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TAS5805M: PWM Switching Frequency vs Temperature

Juan Pablo Novo
Intellectual 875 points
Part Number: TAS5805M

Hi.

I would like to confirm the relationship between PWM Switching Frequency (Fsw) and power dissipation.

In 9.4.6.3 Hybrid Modulation from the TAS5805M datasheet it is said that to minimize power dissipation, low Fsw and proper LC filter is recommended. This is confirmed in this thread as it is advised to use Fsw=384kHz.

But in 10.1.2 Inductor Selections Table 50 it is showed that lower Fsw generates bigger peak currents during power up, what seems to somehow contradict the above. In this sense, this another thread advices to use Fsw=768kHz.

Could you confirm which Fsw is better to minimize power dissipation?

Additionally, speaking about power dissipation, is there any difference between using Process Flow 3-Band DRC & FIR (1.0 48k) and Process Flow 3-Band DRC (1.0 96k)?

Regards,

Juan Pablo Novo