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This paper proposes the structured singular value () approach to the problem of designing an output voltage regulator for a Buck-Boost converter with current-mode control. This approach allows a quantitative description of the effects of reactive components' tolerances and operating point variations, which strongly affect the converter dynamics. At first, a suitable linear converter model is derived, whose parameter variations are described in terms of perturbations of the linear fractionaldoi:10.1109/87.748148 fatcat:uug6vpkncbewraggiig5cmz5li