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TPS65987DDKEVM: Unable to use the evm to charge a battery

Shwetanshu Singh
Prodigy 200 points
Part Number: TPS65987DDKEVM
Other Parts Discussed in Thread: TPS65987DDK, , TPS65987, TPS25751, BQ25798

Tool/software:

Hi,

I am using a TPS65987DDK evaluation board out of the box to charge a battery. As I understand, out of the box the EVM is configured in a DRP and should support the EVM to act as a load.

I have put the jumpers J4 and J5 in the suggested positions as given in the user guide. The unit power ups when I connected a type C wall adapter and I can see output voltage at the barrel jack connector. However, as soon as I connect a battery to the connector, the unit switches off. The SYS_PWR LED is glowing, but the VAR DC DC led switches off. The wall adapter connected also switches off. The wall adapter used here is a 65W laptop charger.

Please suggest if I am doing something wrong.


Thanks
Shwetanshu

  • 0
    TI__Mastermind 30172 points

    Hi, 

    Thank you for reaching out!

    Could you please share a block diagram of your test setup? Where is the battery being connected to? Are you using a real battery or a battery simulator? 

    Best Regards, 

    Aya Khedr 

  • 0 in reply to Aya Khedr
    Prodigy 200 points

    Hi Aya,

    Thank you for your response. I am using a real battery not a simulator. It is connected to the barrel jack connector of the EVM. Please find the block diagram below.



    Regards
    Shwetanshu

  • 0 in reply to Shwetanshu Singh
    TI__Mastermind 30172 points

    Hi, 

    The Barrel Jack connector (J9) is used to power the EVM (i.e. to provide power to the input of the variable DCDC converter). 

    Out of the box, the TPS65987DDKEVM is configured to use the PPHV1 as sink path (J4) and PPHV2 as source path (J5). 

    When connected to a Type-C wall adapter, the TPS65987 will behave as a Sink and Request a PDO advertised by the Source. In this case, PPHV1 is the sinking power path. In battery charging applications, the sink power path would be connected to the input of the battery charger to control charging a battery. 

    In other words, a battery should not be connected to the output of the PD controller. The PD controller is responsible for negotiating the required voltage/current levels and does not charge a battery on its own. 

    Also, please note that the TPS65987DDK is not recommended for new designs. We recommend the TPS25751 for DRP battery charging applications. 

    The TPS25751 has integrated I2C support for TI supported battery chargers. We also have reference designs such for PD+BQ applications. 

    Please let me know if you have additional questions/concerns. 

    Best Regards, 

    Aya Khedr 

  • 0 in reply to Aya Khedr
    Prodigy 200 points

    Hello Aya,

    Thanks for your response. I am aware that TPS65987DDK is not recommended for new designs. However, I was not able to find any other EVMs available and wanted to make a proof-of-concept demonstration. Hence, I am using this EVM.

    Please suggest how can I achieve the following functionality with this EVM:
     Goal: to make a system to use both sink and source capabilities of this EVM.
     Requirement: 1) Connect wall adapter to type c port and charge a 12V battery (if charger required, pls suggest)
                            2) Power up the EVM from the same 12 V battery and charge a mobile phone via the type C port (problem here is that 20V is required for the EVM to power up, I can use a buck-boost converter)
                            3) Components cannot be swapped for 1 and 2 to work it has to be a comprehensive setup for both 1 and 2.


    Thanks
    Shwetanshu

  • 0 in reply to Shwetanshu Singh
    TI__Mastermind 30172 points

    Hi Shwetanshu, 

    I recommend looking into the following EVM used to evaluate both TPS25751+BQ25798 for battery charging applications: https://www.ti.com/tool/USB-PD-CHG-EVM-01

    Best Regards, 

    Aya Khedr