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BQ78350+BQ76940+BQ76200作为BMS的主控芯片，PACK+/PACK-给DC/DC模块供电，DC/DC模块使用LM5085
当负载开关闭合，PACK+/PACK-给LM5085供电，bqStudio的DSG，CHG同时变低，AFE_OVRD变高。
当负载开关断开，PACK+/PACK-停止给LM5085供电，DSG和CHG恢复正常。
这是啥原因呢？
