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TINA Load step

Hey there

I try to create a load step in my simulation. I want to perform a transient analysis.

I have load resistor and the end of my circuit. In the first two milliseconds it should be around 18Ohm with the current of 100mA and after two milliseconds it should ramp down to 1.8 Ohm to do a load step to 1A.

I want to see the reaction of the Buck converter, if it can handle the load step.

In ltspice I would do something like this:

How do I do this in Tina?

Thanks in advance!