Part Number: TPD1S414
In the datasheet, it stated OVP response time to nFET off is 100ns max. But Figure 7 shows differently. Which one should I follow? What is the exact threshold for complete cut off?
I understand what you are talking about. However if you see on Figure 7, around 70ns after the VBUS_CON goes above the 6.2V threshold (OVP limit for TPD1S414), you see VBUS_SYS going down.
At this point the FET to VBUS_SYS is completely turned off. What you are seeing with the tail that goes to 0 is the discharging of the capacitor on VBUS_SYS.
So to answer your question of when does it exact shut off is completely dependent on the size of your capacitor on VBUS_SYS side.
Also Section 18.104.22.168 of the datasheet has a good explanation of why that capacitance is there.
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