All the curves are based on measurements made on a PCB design with dimensions of 3.2 inches (W) × 2.7 inches (L) × 0.062 inch (T) and 4 layers of 2 oz copper. The safe operating area (SOA) curves displays the temperature boundaries within an operating system by incorporating the thermal resistance and system power loss. A buck converter is used for measuring the SOA. Figure 2 outlines the temperature and airflow conditions required for a given load current. The area under the curve dictates the SOA for different airflow conditions.
VDD = 5 V
Figure 1. VDD Supply Current vs Switching Frequency
GaN third quadrant conduction.
Figure 3. Source-to-Drain Current vs Source-to-Drain Voltage
VIN = 48 V
VOUT = 5 V
fSW = 1 MHz
Figure 2. Safe Operating Area
Figure 4. GaN FET On-Resistance vs Junction Temperature