SIMPLIS (SIMulation of Piecewise LInear Systems) is a circuit simulator specifically designed to handle the simulation challenges of switching power systems. Like SPICE, SIMPLIS works at the component level but typically can perform a transient analysis of a switching circuit 10 to 50 times faster. For switching power systems, the piecewise linear (PWL) modeling and simulation techniques employed by SIMPLIS result in qualitatively superior convergence behavior.

To correlate, the Simplis simulation conditions should match with the bench test setup. According to bench test conditions in Section 2.2.1, a summary of TPS56C231 Simplis load transient simulation conditions are listed in Table 2-3.

After setting simulation conditions, two analysis setting steps are also required. One is to add the probe. For load transient, Vout signal probe should be added. Second is setting the simulation analysis. On the top menu, select Simulator and Choose Analysis. The Choose SIMPLIS Analysis table will be popped up, as Figure 2-6 shows. Then select Transient analysis and voltages only or probes only options. What’s more, analysis parameters of saving data time should match with oscilloscope saving waveform time.

On the top menu, select Simulator and Run Schematics. The load transient simulation result of Vout is generated, as shown in Figure 2-7.

Next step is saving simulation waveform to CSV file. Right click the Waveform Window, choose Copy to Clipboard, click Graph Data, then select the VOUT curve, click OK, and open the excel to paste the data, as shown in Figure 2-8.