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Hi,I am from ASUS SZ NB POWER Team.We have some questions about bq24780 now.Our protection use the independent comparator of bq24780(when CMPIN pull high,CMPOUT pin's output is low,our protect will be enable).We find independent comparator doesn't work at the second protection after ACFET is latched off .
we can find COMPOUT pull low when AC_BAT_SYS is up to 25v at the first time.however,when AC_BAT_SYS pull up to 25v again,COMPOUT doesn't pull low.Can you give a reason for this?Our ovp is under 26V,which is charge IC's ovp.In normal operation,our ovp will work before charge IC trigger ovp.
Before ACFET is latched off,our ovp works normally with bq24780's independent comparator.There is a picture about it below.
.In fact ,COMOUT can change its level when the ACFET is latched off.It fails to work after several transformation.
we find that the independent comparator fails to work .COMOUT pull high when COMIN arrive at 2.372v.
What is the difference between ACFET is latched off or not?Why independent comparator dosen't work persistently? And we want to know how to make sure that the independent comparator will work normally.
Thanks!
