• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 33 subscribers
  • Views 208 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TPD4S311: Use SBU pin to protect CC

Far Hung
Expert 6940 points
Part Number: TPD4S311

Hi Expert,

My customer plan to use one TPD4S311 to protect two PD CC pin. I draw the block diagram as below, Is it possible? any side effect?

  • +1
    TI__Genius 12665 points

    Hi Far,

    Technically, yes this is possible if not using dead battery mode. However, it is not recommended.

    This is because the electrical tolerances for the CC and SBU pins on the TPD4S311 are different, meaning different protection levels will be provided to the CC lines connected to CC and the CC lines connected to SBU.

    Additionally, there are no dead battery Rd pull-down resistors for the SBU pins. The dead battery RD pull-down resistors allow dead battery charging simultaneously with high-voltage OVP protection. When the TPD device is used to protect the CC lines, the Rd resistors integrated in our PD controller are isolated by the OVP switch on the TPD device during dead battery mode for protection. This OVP switch exists for both CC and SBU paths. This means in dead battery mode, there will be no Rd presented on the CC lines connected to the SBU pins and therefore no sinking in dead battery mode. 

    If dead battery mode is needed, no type C connection will be made for the port with CC lines connected to the SBU pins of the TPD device, because of no Rd seen.

    Best,

    Alex