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BQ27Z561-R1: Delay time for VCT is less than 80s

Part Number: BQ27Z561-R1


I use BQ27Z561-R1 for the valid charge termination condition of the delay time for VCT is 2*40s =80S,We find it is less than 80s,what the reason?

I set taper current=280mA,Charge Term Voltage Offset=45mV,Standard Temp High Charging Voltage=4530mV,when voltage≥4485mV,Average current<280mA,it takes only 55s then it triggers VCT.