Usually, parametric synthesis of controllers for a closed control gem freemax tank system is carried out for nominal conditions, and then the source performance for other load resistance values is estimated.As a result, the control system may not always provide the sufficient mode stabilization with a changing load resistance value.The paper suggests an alternative version.It deals with estimation of dynamic transient responses for the required mode parameter in an open-circuit system as well as with determination of transfer functions and the controller parameters for the most complicated primera mano tequila version of transient response curves.The paper presents the results of simulation modelling of dynamic operating conditions for LLC converter using Simulink Matlab as well as load characteristics for three versions of a closed control system.