15V/6A, 90W switching regulated power supply

The circuit of a 15V/6A, 90W switching power supply composed of MC33374 is shown in the figure. Using the E28 ferrite core, the wire diameters of the primary coil and feedback coil remain unchanged, and the number of turns should be 34 and 4 turns respectively. The secondary coil is made of double φ0.8mm enameled wire and wound with 5 turns. The air gap of the magnetic core is 0.56mm. The measured technical specifications of this power supply are shown in the following table. The measured technical specifications of this power supply are shown in the following table. The 　　　　measured technical specifications of this power supply are shown in the following table.