The training provides practical approaches to developing a high performance LLC tank configuration in relation to your design targets, and selects the right components and optimizes their values, based on a power loss budgeting plan. These concepts will be demonstrated using existing free cost tools (Excel, LT spice) and Eval board designs. The training has three parts. LLC converter FHA model was used to develop circuit equations that are simple yet physically insightful. Boundary condition (point between inductive and capacitive mode of operation) investigation using vectors is the core of this novel method. Discovery of the orthogonality between inverse gain vector of the LLC and serial equivalent load vector leads to the very simple and close form equations for the LLC components. Having in mind limitations of FHA model, it was necessary to bring exact solution from time domain and compare them with FHA results. It was done by using simplified LT spice simulation. Comparison resulted with generation of the ROT (Rules of thumb) for LLC design. Application of this method was demonstrated on 600W LLC converter reference design. The topic will be treated in depth on intermediate level.