This is mohan from india.
I'm using BQ24074rgtt ic for charging li-ion battery.
When my battery voltage drops down below cut-off voltage(i.e) below 2.4V for my battery, then the protection circuit inside the battery will not discharge and it measures to be 0V.
So, I think,the problem is our ic is sensing the battery voltage and it gets 0V and so it assumes that there is no battery and there it is charging the battery.
I remove the battery from the equipment and just connecting with dc charger. it is charging now.
So help me how to sort out this problem..
When the protector is open, are you getting a waveform line in figure 2 in the data sheet.
Are you using a thermistor in the battery pack?
No, i'm not using thermistor circuit in battery and i don't ve equipment to analyze waveform. So how to proceed further..
Thanks for support..
You are at a disadvantage without a scope. if you have a DMM meter what is the battey voltage (DC and AC). If you have an AC component then the BAT pin is probably in the battery detect mode. If in that mode the BAT signal should provide 100mA and close the protector.
If the BAT pin stays low (no AC component) then there may be a short on the BAT pin.
You should do a separate test on your battery to see how much current and time it takes to close the protector. It may be that the time constant to close the protector is too long.
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