The inductor current for different converter topologies at 2A and 10A load currents. The inductor current shown in all figures verifies the accurate load sharing and phase shift of 180 degrees among two parallel phases. A small error in the inductor peak current can be seen through the scope plots. This error is caused by the slight variation in the selected inductor values. Therefore, TI recommends to use the same inductor value with similar tolerance for the parallel operation. Also, in all input voltage conditions, no prominent ripple is seen in the output voltage of the parallel operation. Thus, this confirms the quality of output voltage regulation of LM51772 converters in a parallel fashion.

Figure 4-3 Inductor Current in Boost Region (V_IN=12 V and 2A Load)

Figure 4-5 Inductor Current in Boost Region (V_IN=15V and 2A Load)

Figure 4-7 Inductor Current in Buck-Boost Region (V_IN=20V and 2A Load)

Figure 4-9 Inductor Current in Buck Region (V_IN=30V and 2A Load)

Figure 4-4 Inductor Current in Boost Region (V_IN=12V and 8A Load)

Figure 4-6 Inductor Current in Boost Region (V_IN=15V and 8A Load)

Figure 4-8 Inductor Current in Buck-Boost Region (V_IN=20V and 8A Load)

Figure 4-10 Inductor Current in Buck Region (V_IN=30V and 8A Load)