IR3550MPBF IR3550MTR IR3550MTRP IR3550MTRPBF IR3550MTRPBF MOSFET或IGBT IR3550MTRPBF MOSFET或IGBT开关IC IR3550MTRPBF PQFN32 IR3550MTRPBF. IR3550PBF IR3550ZMTRPBF