Simulate power circuits in LTSpice. Using variable load in Watts.

[conducteur]

I'm currently simulating power supply circuits with LT SPICE. I want to simulate different parameters in function of the load. My load is currently a resistor with a changing value. (from 1 to 20 ohm).
Can i define a load in Watts so i have the power in watts on the x-axis?
Rian

[ANTALIFE]

I know that if you hold ALT and click your load resistor you would get a plot for the power dissipated by it. You can then hold CTRL and click on the plot name to get the average & rms values for the dissipated power. Not sure if this helps as I assume you are automatically varying the load, but give it a try.

[Mj12]

You can create controllable constant power load by using arbitrary behaviour current source (bi) and define its current to something like I=v(control)/v(load) where load is net name for net that is being loaded and control is net name for voltage source that defines load power. You can also replace v(control) with for example {power} that allows you to define power level with ".param power=10" statement elsewhere in simulation or power can be variable in .step simulation