Hello All,
I am using the BQ25015 in our system to charge a li-ion battery and power up our board. The Rset resistor (R34 in the attached schematics) is originally
a 2.2K resistor and that worked fine but the charge current was too high for our needs and so I have changed this resistor to a 4.3K and it seemed to work fine
and give us about half of the charging current.
The problem is with deeply discharged batteries, where the device enters the battery pre conditioning mode. In the original design (Rset=2.2K) that worked fine but
now, with the 4.3K resistor, this feature does not seem to function any more.
More ever, in the original design, I could connect the charging adaptor to the board without a battery, and the board would turn on and work. Now, when I connect
the charger without a battery, the board does not power up.
I know Rset is involved both in setting the charging current and also in setting the precharge rate but I cannot seem to figure out why changing it from 2.2K to 4.3K made
the impact above.
Thank you very much,
Nir.