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BQ25750: MPPT charging architecture problem

Allen Yang
Prodigy 25 points
Part Number: BQ25750

Tool/software:

In the datasheet, there is a note stating:
"When the system is directly connected to the input supply, the device cannot limit the system load. Therefore, the MPPT algorithm may not find and track the true MPP under all conditions. To enable MPPT operation, it is recommended to connect the system load directly in parallel to the battery pack."

My questions are:

Does this mean that when using MPPT, there should be no system load on VSYS?

If the system must be connected at the VSYS, are there any guidelines to improve MPPT accuracy and avoid unstable behavior during the sweep?

Thank you for your support.

  • 0
    TI__Mastermind 30675 points

    Hello Allen,

    Allen Yang said:
    Does this mean that when using MPPT, there should be no system load on VSYS?

    Yes, we recommend that there should be no system load when using MPPT.

    Allen Yang said:
    If the system must be connected at the VSYS, are there any guidelines to improve MPPT accuracy and avoid unstable behavior during the sweep?

    I recommend making sure that the BQ25750 and the system load together won't brown out the power source. You can help make sure of this by setting the ACUV or VAC_DPM voltage of the BQ25750 higher.

    Best Regards,
    Ethan Galloway