Fig. 1. The modeling diagram of the PCB

Fig. 2. The schematic diagram of the circuit

Fig. 3. Simulation models in this paper and reference[3]

Fig. 4. Comparison of model simulation results and measured TIS between this paper and reference[3]

Fig. 5. The change chart of the resonant frequency of the heatsink versus the side length

Fig. 6. Simulation and measured data of heatsinks versus different side lengths