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BQ25720: Charge IC

liting Lei
Intellectual 325 points
Part Number: BQ25720

Tool/software:

HI TI:

     On BQ25720 Vpsys calculation, t

Psys_ratio=1UA/W is selected, As RAC=RSR=10mohm,Vpsys=1UA/W*PSYS*Rpsys,

As RAC=RSR=5mohm,Vpsys=1UA/W/2*PSYS*Rpsys,

Please help to confirm above calculation is correct or not, thanks

  • 0
    TI__Mastermind 20180 points

    Hi Liting,

    PSYS= PBUS+PBAT=VACP*IIN+VSYS*IBAT=VACP*(VACN-VACP)/RAC +VSYS (VSRN-VSRP)/RSR 

    For 10mOhm, PSYS=[VACP*(VACN-VACP)+VSYS(VSRN-VSRP)]/10

    For 5mOhm, PSYS=[VACP*(VACN-VACP)+VSYS(VSRN-VSRP)]/5

    Please note, VACN-VACP for 10mohm is not going to be the different for the same power level and nor does VSRN-VSRP.