The thermal images are shown in the following figures. The ambient temperature is 25°C, and the thermal images were taken with 13.5-V input and all outputs at a full load of 3 A. The controller was operated for approximately 30 minutes before thermal images were taken to ensure the thermal steady state was reached. The board is 4-layer PCB, the copper of the top and bottom layers is 2 oz, and the copper of middle layers is
1 oz.

Figure 2-2 Top Side Thermal Image,
V_{PA_BUS} = V_{PB_BUS} = 5 V

Figure 2-4 Top Side Thermal Image,
V_{PA_BUS} = V_{PB_BUS} = 9 V

Figure 2-6 Top Side Thermal Image,
V_{PA_BUS} = V_{PB_BUS} = 15 V

Figure 2-8 Top Side Thermal Image,
V_{PA_BUS} = V_{PB_BUS} = 20 V

Figure 2-3 Bottom Side Thermal Image,
V_{PA_BUS} = V_{PB_BUS} = 5 V

Figure 2-5 Bottom Side Thermal Image,
V_{PA_BUS} = V_{PB_BUS} = 9 V

Figure 2-7 Bottom Side Thermal Image,
V_{PA_BUS} = V_{PB_BUS} = 15 V

Figure 2-9 Bottom Side Thermal Image,
V_{PA_BUS} = V_{PB_BUS} = 20 V