What are the uses of Schottky diodes?
Schottky diode is a low-power, ultra high speed, and short reverse recovery time diode. Therefore, Schottky diodes have many applications, such as high-frequency, low-voltage, high current rectifier diodes, freewheeling diodes, protection diodes, rectifier diodes, small signal detection diodes, etc. In microwave communication and other circuits. Generally speaking, Schottky diodes are commonly used in communication power supplies, frequency converters, etc. Common packaging forms include TO-220AB ITO-220AB、TO-247。 There are many types of surface mount Schottky diodes named after SS.
Schottky diodes typically have low voltage resistance but fast recovery speed, making them suitable for high-frequency applications. Therefore, switch mode power supplies use diodes as rectifier outputs. However, the temperature of the rectifier tube on the switching power supply is still very high. The characteristics of Schottky barrier make the conduction voltage drop of Schottky diode lower, which can improve the switching speed. Schottky diodes can be roughly divided into two packaging types based on the current limitation they are subjected to. The low current type (such as SS14 and SS24) and high current type (such as MBR20100CT and MBR10100FCT) are packaged as TO-220AB and ITO-220AB.
The structure and characteristics of Schottky diodes (low starting voltage and small charge storage effect) make them suitable for high-frequency rectification in low voltage and high current output scenarios. Schottky diodes are also commonly used in many integrated circuit products and are widely used in various electronic products. Schottky diodes are not made using the principle of forming a PN junction through the contact between P-type and N-type semiconductors, but using the principle of forming a metal semiconductor junction through the contact between metal and semiconductor. Therefore, Schottky diodes are also known as metal semiconductor (contact) diodes or surface barrier diodes, and they are a type of hot carrier diode.
The frame and pins used for Schottky diodes are forged using seamless welding technology. This material is high-purity oxygen free copper, which has bending resistance, oxidation resistance, and high conductivity. The packaging adopts imported epoxy resin, which has better packaging and flame retardant properties. Screen printing uses laser marking, which never fades, is efficient and environmentally friendly, and to some extent reduces production costs.
The function of Schottky diodes is mainly reflected in the switching circuit of bipolar junction transistors (BJTs). By connecting the Shockley diode to the BJT for clamping, the transistor is actually in a very closed state when it is in a conducting state, thereby improving the switching speed of the transistor. This method is used for TTL internal circuits of typical digital integrated circuits such as 74LS, 74ALS, and 74A S.