Preliminary Considerations Using Power MOSFET Data Sheet Information
Before starting a device characterization, study the manufacturer's data sheet for a power MOSFET to characterize. Each manufacturer has a unique design and naming convention for their data sheets. Different manufacturers also measure device characteristics differently.
- First, determine the nominal conditions for the device. Ideally, these are the conditions at which the device will be operated. Practically, these conditions are those for which you have the most information closest to the desired operating conditions. Search the data sheet and look at all available data to decide on the nominal point. The measurement conditions for the dynamic characteristics (Eon, Eoff, td(on), and td(off)) are generally good choices.
- DC characteristics are parameterized using the transfer and output characteristics, which are found as plots in the sheet.
- Dynamic behavior is characterized using the
switching energies and times, which can be found either in a table or
read from a plot.
Note:
The power MOSFET wizard documentation includes information and recommended settings for several manufacturers. Consult these sections in the documentation before characterizing a device.