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TPS2561: overcurrent condition

Shu-Cheng LIN
Guru 11785 points
Part Number: TPS2561

Hi Sirs,

Sorry to bother you.

We would like to know the overcurrent condition of TPS2561
The timing of signal pull low can be adjusted values from RFAULT and CRETRY in the figureA below?

Because our USB hub is minimum 8ms pull signal length required.
Then return the overcurrent to the SOC

Thanks!!

  • 0
    TI__Mastermind 18031 points

    Hi sir,

    That's right.

    As overcurrent condition occurs, after about 9ms deglitch, fault will pull low which will pull EN to low either.

    Then the part will be disabled.

    External signal will charge Cretry through Rfault.

    The part will re-open until the voltage of EN pin reach turn on threshold 1.1V.

    So you can adjust the low duration by Rretry and Cretry.

    For TI's policy, I will first click resolved button.

    If you have any other concern, contact me any time.

    If you think resolved, please help click 'Issue is solved button'.

    Thanks.

  • 0 in reply to Ziv Zhang
    Guru 11785 points

    Hi Sirs,

    Thanks for your reply.

    For now our design is s follows three screenshots

    The Enable and Fault of the TPS2561 are connected by CN213.
    And the USB3_EN_OC# signal has a pull up resistor R493 to pull the voltage to 3.3V.
    Connect the USB3_EN_OC# signal to the USB hub (U42A)

    Based on the design
    We add the R1389 and C1185 which in the green box
    We would like to control the timing of overcurrent signal pull low
    Is it feasible?

  • 0 in reply to Shu-Cheng LIN
    TI__Mastermind 18031 points

    Hi Sir,

    That makes sense.

    R1389 and C1185 is one order RC circuit.

    You can calculate the RC circuit to confirm the time.

    For TI's policy, I will first click resolved button.

    If you have any other concern, contact me any time.

    If you think resolved, please help click 'Issue is solved button'.

    Thanks.