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BQ24630 based LiFePO4 battery charger for 4 cells.

Jawaid Dilawar
Prodigy 20 points

I am designing a LiFePO4 battery charger for 4 cells in series, i.e, 14.8V charging voltage and charging current is 4A.

What should be the Vin (Adaptor voltage) for this application? I want to keep it to minimum possible as my system voltage has limit of 16V max.

Your advice will be highly appreciated.

Best regards,

Jawaid Dilawar

 

 

  • 0
    TI__Expert 5640 points

    The Bq62430 has a maximum duty cycle of 99.95% which equals the ratio of Vout/Vin.  In this case, Vin would be the adapter voltage minus any DC drop across (referenced to schematic shown in Figure 1 of the datasheet) Q1,Q2, Q4, L1, RSR, RAC and the traces.  You can work backwards to find the minimum adapter voltage based on your component selection.  In practice, you would want to make the input voltage as high as possible for better efficiency and margins.