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TPS26750EVM: Using TPS26750EVM to charge a battery

Dattatreya Roy
Prodigy 70 points
Part Number: TPS26750EVM
Other Parts Discussed in Thread: BQ25756EVM, , BQ25756

Tool/software:

Hello,

I want to use the TPS26750EVM as a sink to charge a battery, either in standalone/PPS mode or by combining it with BQ25756EVM. After going through the TPS26750EVM user guide (which I personally found it to be a bit confusing due to version errors/mismatch), I have come up with the following configurations which can be used to charge a battery, can you tell me which one is correct or in any of them are correct at all?

1. Dead battery safe mode / Dead battery always enable sink mode -

Config 1 -

- Connect a 140W USB charger to J3 to power the board 

- Connect another 140W USB charger (which is the main charger with which I will be charging my battery) to J4

- Access power output from J7 which will then go to the battery/BQ25756EVM board

Config 2 -

- Connect a 140W USB charger to J4 

- Use the same charger to charge the battery by accessing power output from J7 which will then go to the battery/BQ25756EVM board

The reason behind my confusion - The user guide description given on page 10 implies config 1 whereas figure 2.4 and 2.5 imply config 2 (as per my understanding)

Which one of the above configurations is correct?

2. TPS26750EVM and BQ25756EVM -

How do we connect both these boards and use the combination as a sink to charge a battery?

A statement on page 13 says - "To source and sink power in the EPR range using the TPS26750EVM, users want connect a simulated battery to
the HV_SYS header (J8) instead of powering the board through J3."

Again as per my understanding -

- Connect a 140W USB charger to J4 

- Use the same charger to charge the battery by accessing power output from J8 which will then go to the battery

Is the above configuration/understanding correct? If the battery is connected to J8 then how are we using the BQ25756EVM board as a part of the sink?

3. Standalone testing mode -

- Connect a 140W USB charger to J3 to power the board 

- Connect another 140W USB charger (which is the main charger with which I will be charging my battery) to J4

- Access power output from J7 which will then go to the battery/BQ25756EVM board

Is this configuration correct?

Best regards,

Dattatreya

  • 0
    TI__Expert 3860 points

    Hi ,

    Thanks for reaching out

    One of our team members will review and share their feedback shortly. 

  • 0
    TI__Mastermind 37855 points

    Hi Dattetreya

    Dattatreya Roy said:
    1. Dead battery safe mode / Dead battery always enable sink mode -
    Dattatreya Roy said:
    Which one of the above configurations is correct?

    To test dead battery sink, you only need to power the board through the J4 connector. J3 would be system power and is not needed for dead battery testeing

    Dattatreya Roy said:

    2. TPS26750EVM and BQ25756EVM -

    How do we connect both these boards and use the combination as a sink to charge a battery?

    Dattatreya Roy said:

    - Connect a 140W USB charger to J4 

    - Use the same charger to charge the battery by accessing power output from J8 which will then go to the battery

    Is the above configuration/understanding correct? If the battery is connected to J8 then how are we using the BQ25756EVM board as a part of the sink?

    Correct.

    If you take a closer look at the BQ25756EVM and it's connection to the TPS26750EVM, you'll notice that the J8 port connects back to the battery terminals of the BQ2756EVM.

    See the magenta line in the first picture to see the power path from the Type-C port, through the BQ25756, and eventually to the J8 port and battery.

    Dattatreya Roy said:

    3. Standalone testing mode -

    - Connect a 140W USB charger to J3 to power the board 

    - Connect another 140W USB charger (which is the main charger with which I will be charging my battery) to J4

    - Access power output from J7 which will then go to the battery/BQ25756EVM board

    Is this configuration correct?

    For standalone non-dead battery testing, this is fine. Understand that the PD controller cannot source >5-V without the BQ25756EVM attached.

    Thanks and Regards,

    Chris