According to the working principle of the buck converter, when the switch is cut off, the continuous current diode is on, the magnetic energy of the inductance is converted into electric energy, and the diode plays the role of continuous current. The positive rated current of the diode must be greater than the load current, and its withstand voltage value must be greater than the input voltage. At the same time, in order to make the switching time from the cut-off to the conduction of the diode as short as possible, the super fast recovery diode is selected According to the design requirements, Schottky diodes with current greater than 1.5A and withstand voltage greater than 30V are selected.<br>
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