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BQ77905: BQ7790518 turn on delay

user44411751
Intellectual 940 points
Part Number: BQ77905

       The BQ7790518 is use for LiFePO4, DSG will have a step of 27mS when it is turn on. However there is no such problem in lion , I used the same board with the same parameters.

  • 0
    TI__Guru 54715 points

    Hi User,

    I do not know a reason  for the different observation.  LiFePO4 cells will operate at a lower voltage, perhaps at a lower voltage they take more time for the DSG output to come into regulation.  

    The BQ7790518 has a 4.25V over voltage threshold which is not well suited to LiFePO4, but once the part has decided to turn on DSG it should turn on in the same manner.  All the part will know is the voltage and current capability of the cells.