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

Figure 2-2 Top Side Thermal Image, 5-V, 3-A Load

Figure 2-4 Top Side Thermal Image, 20-V, 3-A Load

Figure 2-3 Bottom Side Thermal Image, 5-V, 3-A Load

Figure 2-5 Bottom Side Thermal Image, 20-V, 3-A Load