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Other Parts Discussed in Thread: BQ25792



  • 您好,4S/750kHz, 推荐您用 2.2uH .  目前只测过最大 3x10uF 25V 在PMID, 5x10uF 25V 在 SYS.  25V rated capacitors de-rate significantly at 4X=16.8V. 

    You might need more capacitance on PMID and SYS.  The VBUS, PMID and SYS 0.1uF capacitors need to be placed as close as possible to those pins and GND, with no vias for the PMID and SYS 0.1uF capacitor.  Also, no vias for the PMID and SYS bulk capacitors. The recently updated EVM user's guide shows the recommended layout.

    Can you give more info on the operating condition at which the charger was damaged?  What charger functions are no longer operating?

  • 按照建议更换2.2UH(IHLP2020BZER2R2M11 )电感后,断开后端所有负载,使用15V,0.1A电源供电,上电后听到一声微响,有元器件烧掉的味道。能否帮忙核查下上述原理图设计(我司现在未使用快充协议,使用直流DC供电)
  • 您好,除了在PMID和SYS需要更多的电容,电路看起来没有问题。您的layout 方便发过来看一下。
    是否方便抓一下 VBUS, VSYS 和 VBAT的波形。