Nominal and tolerance design of feedback compensators for switching regulators

The robust design of feedback compensation networks for DC-DC regulators is discussed in this paper. The method proposed allows the selection of optimal solutions among different feasible projects that fulfil the feedback loop constraints. The optimal commercial values of circuit parameters and of their tolerances are found by means of an extension of the Monte-Carlo technique which uses interval arithmetic to make computations with toleranced parameters. The results presented in this paper highlight that, given a set of design constraints, the best projects are identified by means of a comparative evaluation of the robustness of the different possible design solution with respect to parameters´ tolerance.