What are the uses of Schottky diodes? — SUNMATE
What are the uses of Schottky diodes?
Schottky diode is a kind of diode with low power consumption, ultra-high speed and short reverse recovery time. Therefore, Schottky diodes have many uses, such as high frequency, low voltage, high current rectifier diodes, freewheeling diodes, protection diodes, rectifier diodes, small signal detection diodes and so on. In microwave communication and other circuits. Generally speaking, Schottky diodes are often used in communication power supply, frequency converter and so on. Commonly used packaging forms include: TO-220AB, ito-220ab and TO-247. There are many types of SMD Schottky diodes, most of which start with SS.
Schottky diodes usually have low withstand voltage, but fast recovery speed. They can be used in high frequency applications. Therefore, the switching power supply uses diodes as rectifier output. However, the temperature of rectifier on switching power supply is still very high. The characteristics of Schottky barrier make the conduction voltage drop of Schottky diode low, which can improve the switching speed. Schottky diodes are roughly divided into two packages according to the current limit. The low current type (such as SS14 and ss24) and the high current type (such as mbr20100ct and mbr10100fct) are packaged as TO-220AB and ito-220ab.
The structure and characteristics of Schottky diode (low starting voltage and small charge storage effect) make it suitable for high frequency rectification in low voltage and high current output occasions. Schottky diodes are also often used in many integrated circuit products and widely used in various electronic products. Schottky diodes are not made by using the principle of p-type semiconductor and n-type semiconductor contact to form PN junctions, but by using the principle of metal semiconductor contact to form metal semiconductor junctions. Therefore, Schottky diode is also called metal semiconductor (contact) diode or surface barrier diode. It is a kind of hot carrier diode.
The frame and pins for Schottky diodes are forged by seamless welding technology. The material is high-purity oxygen free copper with bending resistance, oxidation resistance and high conductivity. The packaging adopts imported epoxy resin, which has better packaging and flame retardant performance. Screen printing adopts laser marking, which will never fade, is efficient and environmentally friendly, and reduces the production cost to a certain extent.
The function of Schottky diode is mainly reflected in the switching circuit of bipolar transistor BJT. By connecting the Shockley diode to BJT to clamp, the transistor is actually in a very closed state in the on state, so as to improve the switching speed of the transistor. This method is used in TTL internal circuits of typical digital integrated circuits, such as 74LS, 74als and 74a s.