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TPS25750EVM: TPS25750EVM Custom Board

Ali Khan
Expert 1150 points
Part Number: TPS25750EVM
Other Parts Discussed in Thread: TPS25750, USB2ANY, BQ25792

Hi,

I am designing a custom board by following the TPS25750EVM reference design. 

Given DATA:

Input = 100W PD Adapter

Output = 5V/9v/15v/20v & 5A (Required)

Battery = 4S Lipo Battery 5000mAh

I have some questions to completely understand the function of each module in EVM.

  1. SINK =  Device will receive power from USB  C port to Charge BATT  and provide power at SYS. Right?
  2. If the above question is right then I need the sink function only otherwise source.
  3. Do I need 5V and 3.3V Buck converter Circuits for sink application?
  4. What is Aardvark Connector?
  5. What is Internal Debug Connector?

  1. How I will interface with the web-based TPS25750 Application Customization Tool GUI?
  2. Do I need it to configure settings all the time after each Power shutdown?

I hope someone helps me to understand it. I have to connect the output of this EVM with the input of TPS65988EVM. The output of TPS65988EVM is connected with two devices to supply power to them.
Thanks

  • 0
    TI__Mastermind 31690 points

    Hi,

    Thank you for reaching out, our team member will get back to you as soon as possible.

    Regards

  • 0 in reply to Tommy Lin
    Expert 1150 points

    Hi
    Is there any update?
    Thanks

  • 0 in reply to Ali Khan
    TI__Mastermind 32661 points

    Ali,

    The TPS25750 Web tool will interface through USB with our EVM only.  It utalizes a custom EVM.

    I see that you added a TotalPhase Aardvark connector.  If you have this connector, then you can use the Web GUI to save a FullFlash Binary and then use totalPhase flash center (A free Totalphase application) to write the binary file to the Flash on your board.

    Once you have configured the EEPROM, it will be used to boot the board on every subsequent reboot.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Expert 1150 points

    i have USB2ANY. Can it help to upload the EEPROM configuration?
    Also, what about other questions?

  • 0 in reply to Ali Khan
    Expert 1150 points

    Hi
    I am using this reference design and there is no micro USB that you might be referring to. As you mentioned above that I can use the Aardvark connector to flash the binary. Can you help me with some documents or links which explain the complete process and what tools, I need for it to complete the project?

    Thanks

  • 0 in reply to Chuck Branch
    Expert 1150 points

    Thanks, 
    That is very helpful. I will buy Toolphase to get it done.
    I believe there is nothing other related to programming or firmware that I should consider except flashing the binary data into flash. Am I right?

    Also, Can someone answer the questions (1,2,3 &5)?

    It will really help me a lot to finish the project asap.
    I have very tight space and I have to get rid of all extra features from my board in the prototype.

  • 0 in reply to Ali Khan
    TI__Mastermind 32661 points
    1. SINK =  Device will receive power from USB  C port to Charge BATT  and provide power at SYS. Right?

    That is correct

    1. If the above question is right then I need the sink function only otherwise source.

    That is correct

    1. Do I need 5V and 3.3V Buck converter Circuits for sink application?\

    No

    1. What is Aardvark Connector?

    This is the connector that allows the board to be programmed.

    1. What is Internal Debug Connector?

    This exposes the slave port of the TPS25750.  This is useful for debugging if you are connecting to a MCU.

  • 0 in reply to Chuck Branch
    Expert 1150 points

    Hi
    Thanks for all your help. It really helps me a lot in finalizing the design. Now I have some questions regarding BQ25792 if you can answer them plz.
    \

    1. What is the function of this connector?
    2. What will be the output voltage at SYS? I am using a 4S 4500mAh lipo battery with a charging rating of no more than 0.5C or maybe less.
    3. I have to connect the SYS output with the input of TPS65988EVM as an input source. The input requirement for TPS65988EVM is 20V and 5A. Should I add a buck-boost converter stage to set up 20V for TPS659888EVM after SYS output Stage?
    4. In the TPS65988EVM, what is the function of the External path circuit? The TPS65988EVM will act as a source in my case because it has to provide power to the devices connected to the USB C ports.
  • 0 in reply to Ali Khan
    Expert 1150 points

    Hi
    I read some more documents and found that the external path is used only for Sink so I eliminated both of the external paths.
    Correct me if I am wrong. 
    Also, Can you help me to define the buck-boost converter stage after SYS output for TPS65988EVM? Also, if you can answer the above questions then it will be very helpful.
    Thanks

  • 0 in reply to Ali Khan
    TI__Mastermind 32661 points

    Ali,

    I will pass this thread onto the team that support the BQ25792 to answer those specific questions.  I am not fully qualified.

    Regards,

    Chuck

  • +1 in reply to Chuck Branch
    TI__Mastermind 40325 points

    Hello,

    I will answer the questions according to the line item.

    1. J3 is for the USB2ANY connection.

    2. Please see Section 9.3.8.2, "When the system voltage is regulated at VSYSMIN and SYS voltage temporarily drops lower than VSYSMIN, the VSYSMIN loop reduces charging current so that the SYS voltage remains at the VSYSMIN level. If the charge current falls to zero, but the input source is still overloaded, the SYS voltage will drop. Once the SYS voltage falls below the battery voltage, the device automatically enters supplement mode in which the BATFET turns on. The battery starts discharging so that the system is supported from both the input source and battery." In addition see Section 9.3.8.1, "The device deploys Narrow VDC architecture (NVDC) with BATFET separating system from battery. The minimum system voltage is set by VSYSMIN bits. Even with a fully depleted battery, the system is regulated above the minimum system voltage. The default minimum system voltage at POR is determined according to the PROG pin configuration resistor."

    3. Yes you will need to setup a converter to convert the voltage. Please note however, that the maximum input power to the BQ25792 is 20 V x 3.3 A or 66 W. The maximum power to the battery and system will be this minus efficiency losses. This means in order to support 20 V 5 A, your battery will need to be supplying 2.02 A assuming a 16.8 V battery in addition to full input power.

    Regards,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Expert 1150 points

    Hi
    Thanks for your detailed explanation.
    In point 3, you mentioned that BQ25792 input power is 66W while it is different in the EVM guide. Can you elaborate further, please?



    Regarding point 1:

    When I am using the Aardvark connector to program flash. What will be the actual purpose of the USB2ANY connector?
    USB2ANY connector is connected with the slave I2C path.
    Thanks

  • 0 in reply to Ali Khan
    TI__Mastermind 40325 points

    Hello,

    This 20 V 5 A describes the TPS25750 capabilities. The BQ25792 is limited to 3.3 A input current. Combining these two capabilities gives 20 V 3.3 A.

    The USB2ANY is intended for the pass through mode.

    Regards,

    Mike Emanuel