I feel good that a parent is trying to help their child. I am disappointed that the next generation of engineer relies on his parent to seek homework help.
A design project is usually a multi-tier project. In this case, understand
- the concept of SMPS
- understand the chip (datasheet)
- understand the simulator and the required inputs to the chip
- understand feedback loops (if feedback external to the chip is required)
- understand minimum load requirements on the chip - if any)
- understand idiosyncrasies of the simulator (like not necessarily making a connection to a node, even though it looks like a connection is made (often caused when moving components or wires - erase and redraw wires to insure the node connects.
I think there is a misunderstanding on the input signals (at minimum) and possibly minimum load and unconnected nodes.