Tapped-inductor　Buck　(TI-Buck)　converter　has　the　advantage　of　appropriate　duty　cycle　ratio　during　large　voltage　conversion　ratio　and　is　widely　used　in　many　cases.　In　order　to　improve　the　performance　of　TI-Buck　converter,　the　control　strategy　of　TI-Buck　converter　is　presented　in　this　paper　based　on　the　energy-shaping　theory　of　interconnection　and　damping　assignment　passivity-based　control　(IDA-PBC)　techniques.　First,　the　Port-controlled　Hamiltonian　(PCH)　model　of　TI-Buck　converter　is　derived.　With　the　model,　the　feedback　controller　of　TI-Buck　converter　is　given　based　on　IDA-PBC　techniques,　and　the　stability　of　system　equilibrium　point　is　analyzed.　Furthermore,　an　integrator　is　added　in　parallel　with　the　passive　output　preserving　stability　to　avoid　steady　state　errors　induced　by　the　presence　of　noise　and　modeling　errors.　In　order　to　verify　the　theory　expectation,　computer　simulation　is　carried　out.　Simulation　results　show　that　the　control　scheme　achieves　a　good　regulation　of　output　voltage　and　let　the　system　have　a　quite　strong　robustness,　and　an　enough　control　capability　to　the　variability　of　input　voltage　and　load.　©　2011　IEEE.