The waveforms of switching nodes at different output voltage with full load condition are shown in following images.

Figure 3-1 PORTA, 13.5-V Input, 5 V, 3-A Load

Figure 3-2 PORTA, 13.5-V Input, 9 V, 3-A Load

Figure 3-3 PORTA, 13.5-V Input, 15 V, 3-A Load

Figure 3-4 PORTA, 13.5-V Input, 20 V, 3-A Load

Figure 3-5 PORTB, 13.5-V Input, 5 V, 3-A Load

Figure 3-6 PORTB, 13.5-V Input, 9 V, 3-A Load

Figure 3-7 PORTB, 13.5-V Input, 15 V, 3-A Load

Figure 3-8 PORTB, 13.5-V Input, 20 V, 3-A Load