Advantages of Schottky diodes

Advantages of Schottky diodes

Schottky diodes has the advantages of high switching frequency and reduced forward voltage, but its reverse breakdown voltage is relatively low, mostly not higher than 60V, and the maximum is only about 100V, which limits its application range. For example, in the switching power supply (SMPS) and power factor correction (PFC) circuits, the Flyback diode of the power switching device, the high-frequency rectifier diode of more than 100V for the transformer secondary, the 600V-1.2kV high-speed diode for the RCD buffer circuit, and the 600V diode for the PFC boost, only the fast recovery epitaxial diode (FRED) and the ultra fast recovery diode (UFRD) are used.

The reverse recovery time Trr of UFRD Schottky diodes is also above 20ns, which cannot meet the needs of 1MHz to 3MHz SMPS in fields such as space stations. Even for SMPS with a hard switch of 100kHz, due to the high conduction and switching losses of UFRD and the high shell temperature, a larger heat sink is required, which increases the volume and weight of SMPS, which is not in line with the development trend of miniaturization and thinness. Therefore, the development of high-voltage SBDs above 100V has always been a research topic and a hot topic of concern. In recent years, SBD has made breakthrough progress. High voltage SBDs of 150V and 200V have been launched, and SBDs made of new materials exceeding 1kV have also been successfully developed, injecting new vitality and vitality into their applications.