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Original question:

BQ24650: bq24650 SPICE Model?

BQ24650: bq24650 in a 24volt Solar System

Kurt Steinke
Prodigy 40 points
Part Number: BQ24650

The bq24650 supports 24volt batteries, but 24volt solar panels typically have a maxmum power point voltage of 31-33 volts, and an open circuit voltage of 38-40 vots. The bq24650's maximum input voltage is only 28 volts. Before I try to "reinvent the wheel", is there a "work-around" that will let me charge a 24volt battery from a 24volt solar panel using the bq24650? If not, is there a similar charger that will charge a 24volt battery from a 24volt solar panel with a switching frequency of at least 300khz?

  • 0
    TI__Mastermind 24075 points

    Hi Kurt,

       Buck battery chargers require an input voltage higher than the output voltage, which is defined by the SLEEP parameter in the BQ24650 datasheet. The recommended max input voltage operating range is capped off at 28V. Solar Panels with an MPPT or OCV higher than 28V is not recommended. Keep in mind the abs max rating of the VCC pin, so if OCV is higher than this, then there is potential for pin damage. 

    BQ24650 is at the high range of input voltage rating in our battery charger portfolio. If input voltage rating of BQ24650 is not high enough, then we do not have a similar charger available.