What are the repair characteristics of Schottky diodes — SUNMATE

Schottky diode is a fast repair diode, which belongs to a power consumption, fast semiconductor component. Its obvious characteristics are that the reverse recovery time is very short (as small as a few nanoseconds), and the positive guiding pressure drop is only about 0.4V. Schottky diodes are mostly used as rectifying diodes, freewheeling diodes and maintenance diodes with high frequency, bottom voltage and large current flow. They are also effectively used as rectifying diodes and small data signal detection diodes in power supply circuits such as optical fiber communication. It is commonly used in the secondary switching power supply rectification and high-voltage power supply rectification of color TV.

Schottky diodes use the metal semiconductor interface as the Schottky barrier to achieve the actual effect of rectification, which is different from the p-n interface caused by the semiconductor semiconductor interface in general diodes. The characteristics of Schottky barrier make the on-off current of Schottky diode low, and can improve the conversion rate. The on-off voltage of Schottky diode is very low. General diodes will cause about 0.7-1.7 amps of current when the current passes through, but the current of Schottky diodes is only 0.15-0.45 amps, which can improve the efficiency of the system software.

Schottky diodes have the advantages of high switching frequency and reduced forward voltage, but their reverse breakdown field strength is relatively low, most of which are not higher than 60V, only about 100V, so that their application scope is limited. For example, in the power transformer (SMPS) and power factor calibration (PFC) power supply circuit, the freewheeling diode of the output power switching element, the high-frequency rectifier diode above 100V for the secondary coil of the transformer, the 600V ~ 1.2MV high-speed diode selected for the RCD oil pressure buffer power supply circuit and the 600V diode for PFC voltage transformation, only the rapid repair external ductile diode (Fred) and ultra rapid repair diode (ufrd) are used.

The characteristic of Schottky diode is that the forward pressure drop VF is relatively small. Under the same current, its forward pressure drop is much smaller. In addition, it has a shorter repair time. Most of them are used as rectifier diodes with high frequency, bottom voltage and large current flow (such as secondary rectifier diodes of power transformers), freewheeling diodes and maintenance diodes. They are also effectively used as rectifier diodes and small data signal detection diodes in power supply circuits such as optical fiber communication. It is common in power supply system, soft starter, etc.