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TUSB319-Q1: Discharge circuit on Fig.2 of the datasheet

Kuramochi Tadahiko
Guru 28715 points
Part Number: TUSB319-Q1

Hi,

P-ch FET is used as discharge circuit on Fig.2 of the datasheet as below.

Though I think that N-ch FET is mot appropriate than P-ch FET, what about it ?

Best Regards,

Kuramochi

  • 0
    TI__Genius 16150 points

    Hi Kuramuchi,

    The N-ch FET is the best solution. With a P-ch FET (your current case) the ID pin will discharge the VBUS circuit when ID='1' (device attachment). With a N-ch FET when ID='0' (no device attachment) the circuit will be discharged that is our objective for this kind of application, in DFP is for security and UFP application is mandatory to protect the system.

    Regards,
    Luis Omar Moran
    High Speed Interface
    SWAT Team

  • 0 in reply to Luis Omar Moran
    Guru 28715 points
    Hi Luis-san,

    Thank you for your answer.
    I understood.

    Which case should P-ch FET be selected?
    Please tell me for my reference.

    Best Regards,
    Kuramochi