PC/CP320 Physical Computing

Power MOSFET (N channel)



image Great care should be taken to avoid static discharge into the chips used in this lab and should always be taken when using CMOS based chips.
voltage divder options
  1. Using a high current resistor of between 50 and 150 Ω for your load, wire up the circuit on the left of the drawing above with the MOSFET as your control element. Use a 12V supply. Remember that when using a MOSFET, you do not need a gate resistor.

  2. Using the variable voltage supply for the input to the gate, see what input voltages are required to produce a voltage across the load of 1V, 2V, 3V, 4V, and 5V.

  3. Plot a graph of Vload vs. Vinput.

  4. Now switch the positions of the load and the MOSFET, as in the right hand picture above.

  5. Repeat the investigation of input voltage required to produce each of the desired load voltages.

  6. Plot the results on the same graph, and summarize how the relative positions of the load and control element affect the input voltage required.

    Demonstrate the relationships between Vload and Vinput for the two configurations.


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