2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/118058The paper considers a DC-DC buck power converter employing pulse width modulation and voltage feedback control. Global asymptotical stability of a periodical operating mode is examined. It is shown that the stability analysis can be reduced to study of a feasibility problem of semidefinite programming.15 pages, 3 figuresOptimization and Control93C23; 93C57; 93D20text