• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 730 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

[TPS65982] Protect function's behaviors

Takashi Onawa
Genius 13200 points
Other Parts Discussed in Thread: TPS65982

Hi Team,

My customer want to know about behaviors of protect functions integrated in TPS65982. The datasheet says TPS65982 has protect functions as below but there are no deep explanation. So could you explain how these functions behave when any faults has detected?

- Overcurrent limiter
- Overvoltage protecter
- Reverse current protecter

Especially, I want to know the two points for each protections above to close their questions.

When does the device get the fault?
How does TPS65982 behave when to get the fault condition?

Regards,

Takashi Onawa

  • 0
    TI__Expert 6280 points
    Hi Onawa-san,

    Overcurrent Limiter:
    The over current is set dynamically depending on the USB Type-C current advertisement and the USB PD power contract current. The current limiting is on all PP_5V0, PP_HV, and PP_EXT power paths.

    Overvoltage Protection:
    When VBUS is above the expected voltage on VBUS the power path is opened and a PD Hard Reset is sent (PD contract in place). This protection also exists when in dead battery when the only power in the system is coming from VBUS.

    Reverse Current Protection:
    This protects the system voltage from going to VBUS when acting as a sink or VBUS to the system when acting as a source. It also enables you to connect two sink paths together in a ORing configuration.

    There is a GPIO that can be configured as a fault notification as well as an I2C interrupt. A good place to start is by checking the datasheet and the firmware user guides.

    Host Interface
    www.ti.com/.../slvuan1.pdf

    Firmware User's Guide
    www.ti.com/.../slvuah7b.pdf

    Data Sheet
    www.ti.com/.../tps65982.pdf

    Jacob
  • 0 in reply to Jacob Ontiveros
    TI__Genius 13200 points
    Hi Jacob-san,

    Thank you for taking your time for my question.
    I didn't make sure about the Overcurrent limitter's behavior well, so let me confirm a couple of points below.
    1. When Overcurrent limitter condition is detected, how do its FETs behave? Latch off or limitting the current to set value?
    2. From the datasheet, I understood that Overcurrent limitter doesn't work in some use case such as PP_5V0 and PP_HV sink. Is this understanding is correct?

    Overcurrent limitter
    PP_5V0 : Souce use case only
    PP_HV : Souce use case only
    PP_EXT : supported both use cases

    Regards,
    Takashi Onawa
  • 0 in reply to Takashi Onawa
    TI__Mastermind 36751 points
    Hi Onawa-san,

    Is this still an open issue?

    Thank you,
    Eric