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TPS55288: 應用在USB PD,直接拔除Vbus和Request 5V PDO的放電速度不一樣

Part Number: TPS55288

應用在USB PD,MODE Register(Address = 6h)的bit4Disable Discharge bit是關閉狀態,

直接拔除Vbus和Request 5V PDO都是進行寫入5V指令,

直接拔除Vbus,從20V --> 5V需要約1.5 sec,

Request 5V PDO,從20V --> 5V只需要約100 msec,

但為何兩個情況的放電速度不一樣?

另外,

請問MODE Register(Address = 6h)的bit4 Discharge bit是否可以常態開啟不關閉?

還是說當拔出Vbus 或是 降壓的時候開啟,然後再關閉呢?