Dear Team,
Please provide support to select cell balance resistor and wattage for 45ma.
maximum cell balance with internal mosfet is 50mA. we selected 45mA.
if 4.1 V and 45ma, we need 91 Ohms and 1W resistor is enough including 75% Power margin.
in datasheet it is mentioned some examples but it is creating confusion in understanding.
BQ77915 - datasheet
10.2.2.1 Design Example
Because cell balancing is required:
– Connect the CBI pin to VSS.
– Determine the resistance for the RIN filter resistors. Since the charge taper current will be 0.05 × 5 A
or 250 mA, 10% is 25 mA. With a 4.1-V cell, 25 mA would require 164-Ω resistance. This resistance
includes the internal RBAL resistance and two RIN resistors. 75-Ω resistors are selected for RIN.
Thanks
Devayani
