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TPD1S414: VBUS discharge USB type-C

Karl Westerberg | Field Application Engineer
Prodigy 700 points

Part Number: TPD1S414
Other Parts Discussed in Thread: TPS25810

Hello, I have a question regarding TPD1S414 in USB type C applications.

in the application note "Protecting the TPS25810 from High Voltage DFPs" and figure 15 with TPS25810 and TPD1S414, a bleeding resistor (R1 = 1M) is added for VBUS discharge. I haven't found any comments regarding this in the datasheet of TPD1S414.

Do you recommend to add an additional resistor or will the internal resistor divider be enough to discharge VBUS?

Thanks in advance,
Karl

  • 0
    TI__Mastermind 34111 points
    The external resistor will be necessary in this case.

    The TPD1S414 does not integrate it because it can be used in non-type-C systems that do not require a bleed resistor.

    In Type-C applications, it is best practice to discharge VBUS when power is not being applied, and it is a very slight power overhead to not switch the resistor out.

    Regards,
    Chuck