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关于TypeC PD多口应用的设计TPS65982

Other Parts Discussed in Thread: TPS65982

PD协议讲:CC PIN检测到有SINK后VBUS上的开关会打开给SINK供电。

那么问题来了,当多口应用时,比如TPS65982的Fig79, 假如第一个口插入SINK

通过协议要了一个20V的电压后,第二个口插入一个5V的设备这个时候第二个口的VBUS开关打开不就把第二个设备烧掉了吗?

求大神解释,我哪里理解有错误?