the .lib model of UCC27526 works only if GND is connected to the simulator GND. If I connect the GND of the UCC27526 model to a different voltage potential (ether floating or fix potential, unless direct connection to GND of the simulator), the model stops working. I tried to "raise" the voltage potential of the UCC27526 with a voltage generator that has 0V, but it still does not work. How can this problem be avoided. I am using LT Spice. For the rest TI .lib files the LT spice work normally worked normally.