DRV5055データシートには、RCが出力変換ノイズを低減するための効果的な方法であると記載されています。
RCフィルタ定数とノイズリダクション率の計算式はありますか?
Ayaki-san,
In general the RMS noise can be calculated by integrating the spectral noise density curve across the operating bandwidth. Peak to Peak noise is approximately between 6 and 6.6 times the RMS value.
In the datasheet we just have this typical value for noise density.
The unfiltered bandwidth of DRV5055 is here:
If we assume a uniform noise density across the entire operating frequency, then a filter set to 10 kHz might be considered to approximately reduce the peak to peak noise by half. It's difficult to make any more accurate approximations since this device doesn't have a published noise density curve.
However, this document does show some better guidance what to expect and how to measure noise density
https://www.ti.com/lit/ml/slyy061/slyy061.pdf
Thanks,
Scott
