Figure 4-1 shows the test results of the relative error between 180° out-of-phase and in-phase load currents for different converter topologies. The error is less than 10% when the total load current is above 2 A for all input voltage conditions, but the buck-boost region (V_IN =16 V) has the least relative error. Similarly, Figure 4-2 shows the test results of the load distribution of two phases under different input voltage conditions. The load distribution between phases seems to be equal, but variation is seen among phases of different input voltage levels, especially for the high load currents.