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TPS25750EVM: Working as Source

Nicolas Gabriel Rios Taurasi
Prodigy 205 points
Part Number: TPS25750EVM
Other Parts Discussed in Thread: TPS25750, TPS25751, BQ25756

Hi team,

Im working on a Proobe Of Concept to test the Power Delivery Chip working as a Source. 

From the "TPS25750 Application Customization Tool" I've tried some settings but no one power up the VBUS with 5V.

How should I do configure the EVM and the software?

Let me clarify my settings:

Software from the GUI:

  1. 5V@3A power source provider
  2. Do not answer
  3. Do not answer
  4. Power Source as preferred role
  5. No USB data is being used
  6. Do not answer
  7. No Vendor ID
  8. No Product ID
  9. No battery Charger Configuration

Hardware:

  • J1: 2-3 (Normal Operation)
  • J2: Connect (Normal Operation)
  • J4: Connected (Enable Flash Boot)
  • J5: Disconnected
  • PPHV Jumpers, connected to the P5V0 voltage (to power up this pad)
  • SYS PWR (Test point): Connected to an external Power Supply at 20V 

But the VBUS voltage is at 0V

The others Test Point (P3V3, P5V0, P12V0) are working fine.

Thanks

  • 0
    TI__Mastermind 37855 points

    Hi Nicolas,

    For new designs, we highly recommend you use the TPS25751. It is the successor part to the TPS25751 and has the latest features and updates.

    I was able to replicate your configuration and flash it to an EVM without any issues. See the attached .json, you should be able to import it into the GUI.

    /cfs-file/__key/communityserver-discussions-components-files/196/EVM-5_2D00_V-Source-Project-_2800_1_2900_.json

    Here are a couple tips:

    • Make sure the configuration loads properly and you see the success message in the GUI
    • Power cycle the board after loading the image
    • You will need a USB-C sink attached to the EVM for VBUS to supply 5-V as the connector will not provide voltage on VBUS until a sink device is detected. I tested with another EVM and with a test phone we have, and was able to see 5-V come up with both.
    • Most of your jumpers look correct and match what I tested on. The only difference is I had the PPHV jumpers connected to each other and not to the P5V0 pins. This should not matter as the PPHV path is not used for 5-V sourcing.

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    Prodigy 205 points

    Hello Christopher,

    Thanks for your reply! I've followed your steps and it works with my phone.
    Regarding to this, I have some questions about my design.

    We have a TPS25750 followed by a BQ25756 as next stage. We want to use the system as a power bank, following this idea we thought to use the reverse buck convertion connected to the PPHV path. But we noticed that in the 5V profile the power delivery sinks its current to VBUS from the PP5V path. Is there any way to configure the chip to take the current from the PPHV path? Because we don't have enough space to place a 5V@3A buck converter (maybe another with less current may be better for our available space).

    Another question is if can we configure the PDO Source Capability as 5V@1A from the register? (Because this is not a PD profile)

    Thanks again for your answer!

    Best Regards,

    Nicolas

  • 0 in reply to Nicolas Gabriel Rios Taurasi
    TI__Mastermind 37855 points

    Hi Nicolas,

    Nicolas Gabriel Rios Taurasi said:
    We have a TPS25750 followed by a BQ25756 as next stage.

    As mentioned before, if this is a new design, we would highly recommend using the TPS25751. The device will officially release at the end of the month and supports the BQ25756 as one of the compatible TI BQ devices.

    Nicolas Gabriel Rios Taurasi said:
    But we noticed that in the 5V profile the power delivery sinks its current to VBUS from the PP5V path. Is there any way to configure the chip to take the current from the PPHV path? Because we don't have enough space to place a 5V@3A buck converter (maybe another with less current may be better for our available space).

    No, the TPS25750 does not have the ability to move the 5-V source path to the external path.

    The TPS25751 does actually support changing the 5-V to PPHV, but still requires a 5-V supply (albeit lower power) due to VCONN requirements.

    Nicolas Gabriel Rios Taurasi said:
    Another question is if can we configure the PDO Source Capability as 5V@1A from the register? (Because this is not a PD profile)

    Not 100% sure what you mean here. The PDOs are only for PD contracts. If you are talking about the type-C current (non-PD), you would have to configure it manually using the TPS25750. There is a setting in the 0x29 Port Control register called TypeCCurrent, which sets the type-C current advertisement for non-PD contracts.

    Thanks and Regards,
    Chris

  • 0 in reply to Christopher Lim1
    Prodigy 205 points

    Hello Chris,

    Let me clarify something:

    • "Another question is if can we configure the PDO Source Capability as 5V@1A from the register? (Because this is not a PD profile)"

    This is what I mean to configure the register in that way:

    What should we do? How can we provide a 5V@1A profile by the USB? Because we don't have enough space to add the necessary components to provide 3A

    We are considering to use TPS25751 if it can resolve our issues, in the next version.

    Thanks again

    Nicolás

  • +1 in reply to Nicolas Gabriel Rios Taurasi
    TI__Mastermind 37855 points

    HI Nicolas,

    If I understand correctly, you want to limit the 5-V PDO to 1-A?

    Nicolas Gabriel Rios Taurasi said:
    (Because this is not a PD profile)"

    I'm not sure what you mean by this comment and am still a little confused.

    You can update the 5-V PDO using the GUI as you have shown.

    Thanks and Regards,
    Chris