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USB-PD-CHG-EVM-01: About the protection

Part Number: USB-PD-CHG-EVM-01
Other Parts Discussed in Thread: TPS25750, TPS54531, TVS2200, BQ25792

Hi,

 

I have a question about the VBUS protection function when connecting "USB-PD-CHG-EVM-01" to a device that does not support USB-PD via the TYPE-C connector and cable.

 

(1) About VBUS protection when "USB-PD-CHG-EVM-01" is the source device

Contents described in "9.3.3.1 Internal Sourcing Power Paths" in the "TPS25750" data sheet,

We recognize that the combination of the surge protection function of "TVS2200" and the OVP / UVLO / CCP / TSP protection function of "TPS54531" is a typical VBUS protection function.

 

(2) VBUS protection when "USB-PD-CHG-EVM-01" is a sink device

Contents described in "9.3.3.2 TPS25750D Internal Sink Path" in the "TPS25750" data sheet,

It is recognized that the combination of the surge protection function of "TVS2200" is a typical VBUS protection function.

 

Is my understanding above correct?

I would appreciate it if you could let me know if there are any mistakes or additional considerations.

 

Best Regards,

Taroimo

  • Taroimo,

    You are very close in your understanding:

    The TVS2200 serves 2 protection provides a Flat Clamp Surge Protection.

    As a Sink, TPS25750 Provides UVLO, OVP,  and RCP protection that is compliant to the type C specification

    As a source, the BQ25792 is used to manage OCP for voltages greater than 5V.  The TPS25750 still provides OVP and UVLO

    As a 5V source only, the TPS25750 provides OCP, OVP, and UVLO.

    The TPS54531 is used to generate the 5V supply require by the TPS25750 to act as a source.  It requires 3A of current capability for VBUS and 600mA of additional current if VCONN is provided on the CC pin that is not used for communication, so we usually select a 4 to 4.5A capable buck for this purpose.

    Regards,

    Chuck

  • Hi Chuck

    Thank you for your support.

    When connecting to a non-USB-PD device, it operates at "VBUS = 5V".

    Therefore, we understand that you should consider each protection provided by "TPS25750 / TVS2200 / TPS54531(only as a source)" except "BQ25792".

    Thanks to you, I also understand why DC-DC converters for 5V power generation require a supply capacity of about 4 to 4.5A.

     

    Best Regards,

    Taroimo