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TUSB320: VBUS_DET

Brian Wang0928
Genius 14060 points
Part Number: TUSB320

Tool/software:

We would like to confirm if VBUS_DET pin can be sustained VBUS voltage up to 28V via a pull-up resistor? Thanks!

  • 0
    TI__Mastermind 39105 points

    Hi,

    The TUSB320 is a CC controller and is not designed to go past a power rating of 5V 3A. 

  • 0 in reply to Vishesh Pithadiya
    TI__Genius 14060 points

    You should misunderstand my question.

    in the Datasheet, it mentioned the VBUS is able to operate up to 28V, but VBUS_DET pin is only 4V? It is making sense? When VBUS is above 28V, the VBU_DET pin voltage stress is ok? 


    below is an example diagram. 

  • 0 in reply to Brian Wang0928
    TI__Mastermind 39105 points

    Hi,

    The TUSB320 was released before the PD spec increased the maximum voltage from 5V. There was a datasheet update to show that Vbus is capable of going up to 28V. However this part cannot take this voltage. 

    The TSUB320 is a CC controller, and the maximum Vbus it can receive is 5V.

  • 0 in reply to Vishesh Pithadiya
    TI__Genius 14060 points

    Thanks. It’s really confusing.

    Do you mean that the VBUS_DET pin can only sustain voltage stress up to 5V only? In the d/s it says the VBUS recommendation is up to 28V, we’re confusing….
    So when VBUS is over 5V, this pin can be damaged? 

    is there p2p device able to sustain the VBUS voltage up to 28V? 

  • 0 in reply to Brian Wang0928
    TI__Mastermind 39105 points

    Hi Brian,

    You will need a PD controller to set and configure Vbus to be greater than 5V. Are you using a PD controller in this application?

    There are 2 options here:

    1) Use PD controller (recommended)

    2) Use CC controller with external protection circuitry

    can you send a block diagram of the proposed system?

  • 0 in reply to Vishesh Pithadiya
    TI__Genius 14060 points

    Thank you Vishesh.

    It looks there's no PD controller in application. Here please find the topology and detailed sch. The project has been in EVT now.  

    Please let us know how to address this issue with below circuitry. Thanks. 

    USB TypeC_Mantis.pdf

    Mantis 5 USB.pdf

  • 0 in reply to Brian Wang0928
    TI__Mastermind 37540 points

    Hi Brian,

    Just to confirm, your primary concern is that the TUSB320 VBUS_DET pin can support a VBUS of up to 28V, correct? 

    The VBUS_DET pin can support 0V to 4V, but it must have a 900KOhm resistor connecting it to VBUS. The VBUS_DET pin has an internal 95KOhm resistor that helps to act as a divider with this 900KOhm resistor, ensuring that the VBUS voltage that enters the pin is within that 0V to 4V range.

    Additionally, the TUSB320 can only support setting the supplied VBUS current to 900mA, 1.5A, and 3A.

    In the scenario where there is 28V on VBUS, are you expecting the TUSB320 to be configured as a UFP or a DFP? I see the device is currently set as a DRP.

    Thanks,

    Ryan