Simulating Buck Converter With Schottky Diode and Gate Driver at 20kHz Switching Frequency

Hello all,I am trying to simulate a Buck Converter in an open-loop mode of operation. I am trying to realize a practical Buck converter but I am unable to do so before I am done with the simulation. However, I encountered 2 major problems that have prevented me from completing the simulation. I am using a Schottky Diode instead of a regular diode since my intended switching frequency is around 20KHZ, I thought it would be a good idea to use a Schottky Diode instead. My other problem is that I have to use a gate driver to power my N-channel Mosfet, which I also am having trouble simulating. So far I have not found a simulation software where I can apply a gate driver and Schottky diode to my Buck converter so I can carry on with building it on my board. Please find attached more details of the project that I am trying to realize.Below are the components that I have ordered, but haven't started building them as I can't start before I am done with the simulation.Bill of materials1  Nmos Mosfet                                Model: BSZ036NE2LS                     Manufacturer: Infenion1 Schotki Diode               Model: MBR745                                  Manufacturer: OnSemi1 Capacitor 200uF                             Model: 010692 Part: 010698     Manufacturer: TOOGOO1 Inductor 100mH         Mouser Part #: 871-B82731M2351A030 Mfr.      Part # B82731M2351A030        Manufacturer: EPCOS/TDK1 Resistor        Part number: 660279 Manufacturer: Xicon Manufacturer no.: CR5-4.0-RC 

1 Gate Driver       Part number : LT1161ISW#PBF     Manufacturer:linear Technology

  Any help you can provide me with is appreciated. 

Linear Technologies LTSpice XVII has all the parts you need to simulate your circuit, it's a free download.Using parts that are not quite the same, and data sheets will pick up the differences, should make little difference to your simulation. Thinking that you should use a Schottky diode is not very helpful, I would assume that you should be able to present a number of arguments for or against there use, since this appears to be a class project.I take it the date at the top refers to 2017, I hope that you have not gone too much over time, all the best,Richard

Dear Richard,
I thank you for your reply. LTSpice was the first software that I have tried to use to simulate my project. You can disregard the date, I have been given an extension because of my health condition back then. The reason why I stopped using LTspice and started looking for other software was that of part 7 in my project, namely the PI controller, which I don't believe LTspice is capable of doing but correct me if I'm wrong. I am expected to use a PI controller in my simulation to adjust changes that occur at the load and to demonstrate the performance of the circuit/controller in rejecting parameter variation in the load resistance. If you have any suggestions for me I would be grateful to you. I appreciate your feedback and wish you a happy new year.