Today, we will be completing our three part series on our Wide bandgap Ecosystems. In part one we focused on physical scalable models and part two we focused on some aspects of our silicon carbide power MOSFET model. For part three of our blog series, we will be focusing on model verification.
Figure 1
We first show the output current-voltage characteristic in Figure 1, located above. The model accurately predicts the entire bias range, including the drift region pinching at high gate and drain biases. Accurate conduction simulation in the right plot highlights the models continuity, which is important for robust convergence performance. We often look at a log scale in addition to linear to uncover hidden inaccuracies and discontinuities.
Figure 2
In Figure 2, we show results for current-voltage, RDSon and threshold voltage over a wide temperature range. SiC MOSFET devices are very attractive thanks to their stable temperature performance. The highly accurate modeling over-temperature enables designers to take advantage of this quality.
Figure 3
Earlier in part one of our series, we introduced the physical modeling for the complex device capacitances. Here are the results in Figure 3. On the left, the CRSS (or CGD) simulation tracks the multiple inflections of the data over two-plus orders of magnitude, only visible on a log scale.
Figure 4
With accurately modeled intrinsic capacitances and device layout parasitics, the switching results come out as demonstrated in Figure 4 - with no additional model tuning needed. This level of fidelity gives the application designer the confidence to precisely simulate device circuit interactions such as dV/dt, dI/dt, switching loss and EMI. Further, gate driver and power loop interactions can be studied and optimized.
It is important to us to meet the varied simulation platform requirements of our customers. Therefore, a SPICE agnostic approach is crucial. By agnostic, we mean we use only least common denominator constructs among industry standard simulation software, steering away from simulator dependent proprietary solutions.
ON Semiconductor provides a portfolio of advanced wide bandgap devices and simulation environments. This full lineup forms an ecosystem that enables our customers to realize the full potential of new and exciting wide bandgap applications and systems.
