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MOS dynamic capacitance simulations

karim karim
Prodigy 50 points
Hello everyone
I am a beginner in Spice, I have a circuit containing a power MOSFET and I want to simulate the MOS dynamic capacitance variations  (Ciss, Crss and Coss) in VDS.
 someone can help me to realize this simulation.
best regards
  • 0
    Genius 3295 points

    Hello Karim,

    I haven't used TINA TI in a while, so I might wrong, but I think you need to build a special macro-model to augment the IC type MOSFET model normally used in most, but not all, SPICE simulators. SPICE is an acronym that stands for Simulator Program with Integrated Circuit Emphasis. So the MOSFET model does not consider the non-linear input capacitance values that are present at the gate of a power MOSFET.  I tried to enclose a pdf that has a nice macro-model that appears to be accurate and it uses data sheet parameters. But for some reason I can't seem to get it to upload.

    Anyway, the macromodel can be found in AN 1194 from International Rectifier-Using MOSFET Spice Models for Analyzing Application Performance.

    It should come up on a Google search about three or four selections down. You can also fine some other nice macro models at the IEEE search engine. I like the AN 1194 model because it is pretty simple and the app note has a nice, clear explanation on how to obtain the parameters from the data sheet.. 

    Chuck[