This section of the tutorial shows you how to
set up a transient simulation for a synchronous buck converter.
This topic addresses the following key concepts:
- The SIMPLIS transient analysis is similar to the transient analysis available in
other simulators, but it runs much faster.
- Although the analysis settings are almost identical to SPICE transient analysis
settings, the math used in each simulator is vastly different. This allows SIMPLIS to
simulate circuits much faster than SPICE.
What You Will Learn
In this topic, you will learn the following:
- How to set up the buck converter to run a basic transient analysis.
- How to enlarge a graph and zoom in and out to examine it more closely.
3.1.1 Specify the Transient Analysis Settings
To set up the transient simulation, follow these steps:
- Open the schematic that you saved after editing the component values in 2.2 Edit Standard Component Values
- From the menu bar in the Schematic editor, select
The Choose SIMPLIS Analysis
dialog opens with three tabs:
- Periodic Operating Point
- Click the Transient tab, and change three settings that to run a transient
simulation from 0 to 500μs and to save all node voltages on the top level of the
- In the Select analysis section on the upper-right side of the dialog
box, click the check box in front of Transient.
- In the Analysis parameters section, set the Stop time to
- In the Save options section, click the radio button in front of
Result: The Transient tab should
now look like this:
- At the bottom of the dialog, click Run.
Note: If you have already selected
Ok or pressed Enter, press the keyboard shortcut F9.
Result: The simulation executes and the waveform
viewer window opens with curves for the three probes.
- To examine this graph more closely, enlarge the window and use the following tips
for zooming in and out on the data:
- To zoom in, press and hold the left mouse button and drag a rectangle
around the graph area.
- To zoom out, press the Home key.
- To return to the previous zoom factor, type Ctrl+Z.
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3.1.2 Save your Schematic
To save your schematic, follow these steps:
- Navigate to your working directory where you are saving your schematics.
- Name the file 3_my_buck_converter.sxsch.
A schematic saved at this state can be downloaded here:
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