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Using bq24745 w/out DPM

Ed P.
Prodigy 90 points
Other Parts Discussed in Thread: BQ24745I am using a bq24745 charger IC in a 24V/30A application. The input adapter current regulation is limited to 11.008A max. In this application I do not require DPM as I have plenty of power to supply the system and charger at maximum current, but would still like to use this charger as I am using it in the same system w/ DPM for separate 12V/10A inputs. How can I not use/disable DPM and the associated inputs?
  • 0
    TI__Prodigy 720 points

    Short CSSP and CSSN (Rac=0ohm).

  • 0 in reply to Mao Ye35
    Prodigy 90 points

    Could the charger be impimented with multiple independant input rails, one having sense and one not:

    12VDC/10A with a sense resistor and 24VDC/30A w/out a sense resistor.

    When the 12VDC rail is present the charger will use DPM w/ the sense resistor. When 24VDC rail is present  there is no voltage present on the 12VDC rail so there should be no voltage drop across the sense resistor and Vdiff should be zero so the charger would operate w/out DPM when 24VDC is present. 

  • 0 in reply to Ed P.
    TI__Prodigy 720 points

    Yes, it is possible.

    For example, notebook when you have adapter or put in doc station, you can connect to different sensing resistors.

    24V may be too high for this IC, the absolute rating is 30V, hot plug in voltage spike may be too high to damage IC.

    Must take care the over voltage spike to prevent IC damage.