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Agreed, it is complicated but I thought they were trying to use the battery charger chip to moderate the switching power supply output. This avoids the efficiency hit of a linear or transistor/MOSFET regulating power via current limiting resistors.
For tickle charging, I would just limit the voltage and let the batteries reach stasis. Low current at a fixed voltage and the problem is solved.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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