LT8708: How does IC select (Constant current/ Constant Voltage) when used Li-ion Battery Charging Application


  I am evaluating LT8708 for Li-ion Battery charging application. We require 2 modes of operation.

1. Constant Current Mode: For a 60V Battery lets say this mode starts when battery voltage is  37V. In this situation FBOUT and IMON_OP both Loops are active. FBOUT is set to have 63V and IMON_OP is set for 6A charging Current. How does it ensure that IMON_OP Error Amplifier dominates and IC works in CC Mode and not in CV Mode?

2. Constant Voltage Mode. After the battery is charged to 63V, only FBOUT error Amplifier must act to maintain battery voltage. This can be done as only FBOUT would be out of limit at this condition.

My confusion is how to ensure that IC operates in CC mode when Required? Do we need to disable the FBOUT Amplifier at that time? The examples in datasheet do not disable any of the Error Amplifiers, so what is the way to ensure its CC Mode operation when output voltage is below set limit.