• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 33 subscribers
  • Views 638 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.

Using the TPS65982 as a Provider/Consumer for Battery Pack

Nathan Loika
Intellectual 370 points
Other Parts Discussed in Thread: TPS65982, TPS6598X-CONFIG, TPS65982-EVM

Hello,


I am looking for more information regarding the functionality of the TPS65982 when used with a battery. My intended usage is to create a battery pack that can be charged or used as a supply over a single USB C connection. There does not need to be data transferred, only power. Can the TPS65982 be configured to allow sourcing and sinking at full power? How does this negotiation happen with a device like a tablet that could source or sink? For battery monitoring I intended to use bq40z60a with a 2s pack (6-8.4V)

Thanks,

Nathan

  • 0
    TI__Mastermind 30280 points

    Nathan,

    The TPS65982 will easily support this application.

    What you are referring to sounds like a Backup Battery Power Bank. Please correct me if I am wrong.

    When the battery bank is completely dead, i.e. VBATT<6V, you will want to support Dead Battery Mode. Since it appears you want to Sink and Source power at >5V (High voltage), then for this example I will suggest you use the PP_EXT FET Path as a Sink to optionally sink up to 5 Amps when the Type-C cable is rated properly.

    You will want to set up the Hardware the following way:

    • Short RPD_G1 to CC1 with a O-Ohm resistor, or directly underneath the BGA package with a wire trace
    • Short RPD_G1 to CC1
    • Short BUSPOWERZ pin to GND with a 0-Ohm resistor to Sink power on PP_EXT in Dead Battery

    You will need to add a buck converter from the battery voltage to provide a stable 5V to PP_5V0 to provide Type-C power before PD negotiation begins. The PP_5V0 FET Path is always a Source (Output)

    If you want to supply the battery voltage directly to a tablet, or boost it up first and then provide 9V or 12V to a tablet, you can use the PP_HV FET path as a Source (Ouptut).

    The PP_EXT FET path will be your only Sink path (Input).

    Now you can use the TPS6598X-CONFIG Config Tool to set up your FW the same way as your HW. You can choose the direction of the FETs & other HW settings in the System Configurations tab, then set up your Sink Capabilities & Source Capabilities tabs to match your systems needs for Sinking PD power from a charger & sourcing PD power to a tablet.

    You can disable/turn off any fields related to supporting data or entering Alternate Modes.

    Other decisions like TrySrc Enable and Initiate Swap to Source Enable will need to set in FW when you are testing your ecosystem to verify that the tablet always resolves as the PD Sink when the Power Bank has a full charge. The charger should always have an Rp pull-up on the CC pin and resolve as the Type-C/PD Source, then Reject power role swaps initiated by the Power Bank.

    I suggest using a TPS65982-EVM to understand the default FW configurations a little better before you make you own FW in the Config Tool.

  • 0 in reply to Brian Berner
    Intellectual 370 points
    Yes you are correct in the application.

    And wow! Thank you for outlining everything so clearly. It gives me a much better idea of what to research and read more into. Once I process things a little more I'll post back with any questions and confirm the answer.

    Nathan