LTspice UVLO excercise
You can consider the two cases separately.
The &quot;Vin falling&quot; case will just be a simple resistive voltage divider. Given \$V_{uvlo} = 1.22\text{V}\$, can you solve for \$V_{in}\$?
The &quot;Vin rising&quot; case will have the current source connected to \$V_{uvlo}\$. The question doesn't specify whether current should be going into or out from the node. You should be able to solve this case using KCL. I suggest you solve for both cases (current in and current out) and see which one causes the circuit to have the right type of hysteresis. Have you learned what hysteresis is?