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BQ25798EVM: BQ25798EVM

SATO KENJI
Prodigy 20 points
Part Number: BQ25798EVM

Tool/software:

I am looking at the BQ25798EVM manual.
If I want to perform a simulation according to this manual, should I connect an electronic load in constant voltage mode to the J5 terminal?

  • 0
    TI__Guru**** 166996 points

    Hi Kenji,

    Ideally, a sourcemeter or bipolar (4 quadrant) power supply in parallel with a large capacitor better simulates a real battery.  If you only have an e-load in constant voltage mode, then I recommend placing a power supply in parallel to provide a base line voltage (like 2.6V*#of cells).  Then set the e-load constant voltage setting to a higher voltage = battery voltage to be simulated.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 20 points

    Thank you for your reply.
    I would like to simulate a 3.3V 4-cell battery.
    Does this mean that I just need to connect in parallel to the J5 terminal an electronic load set to 13.2V constant voltage mode and a stabilized power supply set to an output of 13.2V?

  • 0 in reply to SATO KENJI
    TI__Guru**** 166996 points

    Hi Kenji,

    An electronic load in CV mode only clamps its voltage. Depending on its response time, the eload and charger output may oscillate.  I recommend adding a >=1000uF cap in parallel with eload.  Adding a parallel power supply to set a a minimum "battery" voltage is also recommended.  The eload sinks current from the power supply until the charger output takes over.

    Regards,

    Jeff