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BQ76940: BQ76940电流采样RC滤波参数选取

Part Number: BQ76940


您好,我想问下BQ76940在进行电流采样时,参考手册给出的采样电阻到BQ芯片端的RC滤波电流取值分别为100Ω,0.1uF,这个参数设置有什么参考依据吗?如果选取其他的参数会对采样值有什么影响吗?

  • 您好,推荐使用这个组合,它最能应对电流的突然变化。

     In the vision of the design SRP and VSS would connect to the battery side of the sense resistor on the board with minimal trace distance.  Real systems vary in construction so the author has added the optional 0.1 uF capacitors to SRP and SRN to avoid resets from transients which can occur in some systems. These added filter capacitors will slow the edges of the current changes and may result is slightly lower accuracy for the CC with dynamic loads. 

    You could add more filtering, it will again slow response to current.  The CC is an integrating converter so it should generally respond well to the ripple in the waveform and we would recommend the standard filter.