NEWS
CONTACT US
Industry NewsYou are here：HOME >> NEWS >> Industry News
Do you know the role of the Schottky diode?
Publish：SHENZHEN ENXIC ELECTRONICS CO., LTD,Schottky diodes, rectifier diodes, fast recovery diodes, switching transistors, thermistors, MOS tube, TVS tube, Youze Electronics Time：2017-09-11 Views:1078
The Schottky diode uses a metal - semiconductor interface as the Schottky barrier to produce a rectifying effect, which is different from the P-N interface produced by the semiconductor - semiconductor interface in the ordinary diode. The characteristics of Schottky barrier make the conduction voltage drop of Schottky diode lower, and improve the speed of handover. Do you know what is the effect of the Schottky diode? The following is the little editor
The Schottky diode is introduced in a simple way.
Schottky diode - principle
The Schottky diode is a metal semiconductor device, which is made of A, such as gold, aluminum, silver, platinum, etc., with N type semiconductor B as negative electrode, and then the potential barrier formed between the two contact surfaces. The Schottky diode has a large number of electrons in the N type semiconductor, and only a small amount of free electrons in the noble metal, and the electrons in the Schottky diode diffused from a high concentration of B to a low concentration of A. There is no hole in the metal A of Schottky diode. There is no hole movement from A to B. As the electrons in Schottky diode continue to diffuse from B to A, the surface electron concentration of B gradually decreases, and the surface electric neutrality breaks down, forming potential barrier.
Schottky diode - Advantages
The Schottky diode has the advantages of high switching frequency and low forward pressure, but the reverse breakdown voltage of the Schottky diode is low, generally not higher than 60V, and the maximum is about 100V, so that the application range of Schottky diode is limited. In the case of high frequency rectifier diodes, switching power and power factor correction (PFC) power factor correction circuits above 100V, a high speed diode in the RCD buffer circuit, a high speed diode between 600V to 1.2kV, and a 600V diode for PFC boost, and so on, only a fast recovery epitaxial diode and a super fast recovery are made. Complex diode. The current Schottky diode has made breakthrough progress, 150V and 200V high voltage have been listed, and the new materials made of more than 1kV have been developed.
Schottky diode - action
Schottky diode, also known as Schottky barrier diode (SBD), is a low power and ultra-high speed semiconductor device. The most notable feature of Schottky diode is that the reverse recovery time is very short and the forward conduction voltage drop is only about 0.4V. Schottky diode is used as a high frequency, large current rectifier diode, low voltage, continuous current diode, protective diode, small signal diode, microwave communication and other circuits as rectifier diodes. Schottky diode is more common in communication power supply, frequency converter and so on. The Schottky diode is clamped in the switch circuit of bipolar transistor by connecting diode.
Schottky diode - Application
Because the Schottky diode base barrier height is lower than the PN junction barrier height, the forward and forward voltage and forward voltage drop of the Schottky diode are lower than that of the PN junction diode. Because Schottky diode is a majority carrier conductive device, there are few problems of minority carrier lifetime and reverse recovery. The reverse recovery time of Schottky diode is only the charge and discharge time of the barrier capacitance of Schottky, which is completely different from the reverse recovery time of PN junction diode. Because the reverse recovery charge of Schottky diode is small, the Schottky diode has fast switching speed and low switching loss, which is especially suitable for high frequency applications.
The structure and characteristics of the Schottky diode make it suitable for high frequency rectifying at low voltage and high current output. It is used for detection and mixing at high frequency. The Schottky diode is used as a clamp in the high speed logic circuit. Schottky diodes are often used in IC, and are widely used in high-speed computers. In addition to the characteristic parameters of the ordinary PN junction diode, the electrical parameters of the Schottky diode for detection and mixing include the intermediate frequency impedance, which refers to the impedance given by the Schottky diode to the specified intermediate frequency when the rated local oscillator power is applied.
Conclusion: Schottky diode is a low power and ultra-high speed semiconductor device. The most obvious feature is that the reverse recovery time is very short (can be a few nanoseconds), the forward conduction pressure drop is only about 0.4V, and the rectifying current can reach thousands of amperes. It is used as a high frequency, low voltage, high current rectifier diode, a continuous current diode, a protective diode, and also used as a rectifier diode and small signal detector in a microwave communication circuit. It is common in communication power, frequency converter and so on.
- PRODUCTS
- LRC
- Frank
- Embedded module
- TRR浙江明德微
- UTC
- Transistor series（ST、LRC）
- Capacitance series
- Fuse series（DA）
- MOS series
- Resistance series
- CONTACT US
- Tel: 0755-82642360
Fax: 0755-82642380
E-mail: sale@enxic.com
Address: Shenzhen city Longhua District Long Lu Zehua Building ten unit 1009 room
- [QR code]