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BQ76930 驱动功率MOS管的原理请教

如下图所示,CHG的电平是相对BAT-的,不是相对于PACK-的,MOS管没打开之前,BAT-和PACK-是没有电气关联的,那么CHG是怎么打开右边的MOS管的,因为我觉得CHG和PACK-之间形成不了电势差。