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TPS65982 current limit setting

Arthur Huang
Expert 6065 points
Other Parts Discussed in Thread: TPS65982

Hi Team,

my customer has a question about the PP_5V0 current limit setting, if their PP_5V0 maximum current limit is set to 3A, per the below table, which setting # will be automatic set by TPS65982 digital core? Note, the table has the MIN, TYP, MAX value, we are not sure how the TPS65982 digital core algorithm will do for the setting # ? for example, for the setting 12, is that meant when the load current is exceed to 3.075A, the current limit protection will possible to be activated? Please advise. Thanks.

Regards,

Arthur

  • 0
    TI__Expert 3625 points

    Hi Arthur,

    Can you try to attach the table again? My collegue and I appear to not be able to view the table that you have posted.

    Regards,
    Karl

  • 0 in reply to Karl Fleischmann
    TI__Expert 6065 points

    Hi Karl,

    here is the table that I capied from product data sheet.  Thanks.

    Regards,

    Arthur

  • 0 in reply to Arthur Huang
    TI__Expert 6065 points
    the table is at page 14 of the product data sheet for the ILIMPP5V, the PP_5V0 current limit setting 0~15.
  • 0
    TI__Mastermind 30310 points

    If the contract is set to 5V, 3A using the PP_5V0 FET path, then the highest setting will be selected:

    PP_5V0 current limit, setting 15 --> Min = 3.019A

    This is to ensure the TPS65982 will allow the system to deliver a minimum of 3A.

    Since the power sink is required to limit its current to 3A per the USB Type-C specification, then our current limiting for the source if purely a safety measure for the system.

  • 0 in reply to Brian Berner
    TI__Expert 6065 points

    Hi Brian,

    customer feedback that for testing purpose, even their sink is drawn about 3.1A, but the TPS65982 is still working, not go into the protection mode, do you know why?

    or do you know at what load current, the TPS65982 will go into the current protection mode? and what will be the current protection operation?

    Please advise. Thanks.

    regards,

    Arthur

  • 0 in reply to Arthur Huang
    TI__Mastermind 30310 points

    Andrew,

    Setting 15 is used for 3A, as I said before.

    Min = 3.019

    Max = 3.69A

    This means that overcurrent protection (OCP)  will kick in at some point between 3.019 and 3.69A, but we cannot tell you at what point exactly it will trip.

    If you have a stable 5V  supply that will source at least 3.7A, you should see VBUS drop to 0V if you sweep current from 3.019-3.69A. In addition, you can use the TPS65982-CONFIG Config Tool to map the P5V_OVERCURRENT_EVENT (active-low) event to any GPIO. This event and all other GPIO events are listed in the FW User's Guide in Table 9 ()

    Again, the OCP is only to protect the system against a short, so we must guarantee AT LEAST 3A will pass through the switch. The USB Type-C current sink is responsible fore limiting its current to a maximum of 3A.