Tutorial for Characterizing a Power MOSFET (Basic Dynamic Model)
Use the power MOSFET Device Characterization Wizard to parameterize a power MOSFET model to match both the DC and dynamic characteristics of a device using information from the manufacturer's data sheet. The information available in the data sheet limits the accuracy of the parameterized power MOSFET model. For example, if the data sheet does not provide a device's transfer characteristics, the accuracy of the gate-voltage dependence of the output is reduced.
The power MOSFET device characterization tool performs the following tasks:
- Static parameter fitting
The static parameter fitting uses the following user-supplied information to determine the value of static core model parameters:
- The MOSFET’s transfer characteristic.
- Its output characteristic.
- Its thermal characteristic.
- The forward and thermal characteristics of the MOSFET’s source to drain diode, if used.
- Dynamic parameter extraction
The dynamic parameter extraction uses additional user-supplied information–namely the turn-on time, turn-off time, turn-on energy, and turn-off energy–to determine the values of the MOSFET’s dynamic parameters. The datasheet test conditions for these parameters, as supplied by the manufacturer, serve as the nominal conditions you must input into the device characterization tool to correctly characterize the device.
- Validation
When the static parameter fitting and dynamic extraction are complete, the device characterization tool uses the static and dynamic parameters to perform a validation based on the test conditions provided.
The wizard characterizes a wide array of power MOSFETs. The available information varies from vendor to vendor, and even between devices from the same vendor. The following procedures include vendor-specific information for help with characterizing models for several vendors' devices. If you have any additional questions, contact Ansys support.
Related Topics
Preliminary Considerations Using Power MOSFET Data Sheet Information