#### ivan_mateo

##### Member level 1

After reading some application notes from infineon and TI, I got some knowledge about design steps related to LLC converter. As you know, there is Q value and this value depends on load. As you increase load Q will increase and decreasing load, Q will decrease. Therefore gain curves yields, gain versus frequency. And gain function parameters are Ln,Q, fn. And there is three zone in gain graph, if the working point in inductive area, it is possible to achive ZVS. But I could not understand how to determine Q and Ln values. Documents have graph gain versus frequency in different Q and L values. Ok we need to choose our Ln and Q values, but how?