Switching behavior is shown in the following figures.

Figure 3-1 SW Node - Primary FET (Q3): 10-V Input, 1.2-A Output

Figure 3-2 Primary FET (Q3): 24-V Input, 1.2-A Output

Figure 3-3 SW Node - Primary FET (Q3): 28.8-V Input, 1.2-A Output

Figure 3-4 Diode (D2): 10-V Input, 1.2-A Output

Figure 3-5 Diode (D2): 24-V Input, 1.2-A Output

Figure 3-6 Diode (D2): 28.8-V Input, 1.2-A Output

Figure 3-7 SW Pin - Buck (U6): 24-V Input, 1.63-A Output