Figure 3-4 shows the simulation of the battery charging circuit with the CC and CV loops. The CC and CV control loops are interconnected through D1 and R19. The battery charging environment is simulated with an output capacitance of 10mF.

Figure 3-5 shows the transient schematic capturing the transition from CC to CV control during the battery charging process. Initially when the battery is depleted, the CC control loop is activated and the battery is charged at a constant current of 8A. The charge current is determined by the DAC ISET. As the battery capacity increases, the output voltage of the CV error amplifier decreases, leading to a gradual transition into CV control. During this phase, the charging current gradually decreases while the charge voltage is maintained at a constant level. Ultimately, when the battery reaches full charge, the charging current approaches zero, and the voltage is stabilized at 4.2V, as set by the DAC VSET reference voltage.