Categories

Schottky Diodes

Schottky diode - a diode with a connector made from a layer of semiconductor (usually silicon) and a layer of metal, called a Schottky diode. Got its name from the German physicist, Poor, Schottky, who invented this device a semiconductor. It is characterized by a lower voltage dropthan the classical silicon planar diode h and a higher frequency of operation than she is. It has many applications in electronics, among other things, as an element of electronic security system, and a rectifier for high frequency signals. Led Schottkiego may be an element that will work in Your project electronic.

Schottky diodes - advance feature

Schottky diode, also known as the insulating indicator or diode with hot carriers, is an indicator of the solid that is created by joining of semiconductor (usually silicon) with metal. Characterized by low voltage drop in the direction of conduction (about 150 mV - 500 mV in comparison with the 600..700 mV, which is characteristic for złączowej led silicone) and a very fast switching signals. Kryształkowe detectors used in the early days of radio communication and metal-selenowe rectifiers used in early power supplies DC pierwszem can be considered primitive Schottky diodes.

Design of Schottky diode

Connector barrier occurs in the diode between the metal and półprzewodnikiem, creating a so-called Schottky barrier. Typical metals used are molybdenum, platinum, chromium or tungsten; półprzewodnikiem typically, silicon type N. Side of the metal is the anode, and the silicon cathode. The choice of a combination of metal and semiconductor determines the forward voltage of the diode. The metal layer is typically deposited on a substrate of semiconductor by physical vacuum deposition methods. Given the small thickness of the layer of metal and the fact that it simultaneously performs the role of ohmic contact to the anode, the LEDs of this type are usually less resistant to punctures, and usually less durable than classic LEDs złączowe. Connector barrier has direct contact with the temperature-sensitive metalizacją, therefore, the Schottky diode can dissipate less heat than equivalent PN having the same value.

Led Shottkiego - Principle of operation

Unlike złączowych LEDs, the Schottky diode is a device with materials większościowymi - only electrons, of which the excess is półprzewodniku of type N, constituting the cathode element, act as carriers of electric current in the semiconductor device. The metal anode is electrically neutral. The biggest difference relative to the LEDs connector PN regeneration at the moment of transition from a state of conduction to the state of the firewall. In the Schottky diode it is much shorter, considering the fact that does not appear here, the district depleted on the connector. Given this, the time of this regeneration in the Schottky diode is several hundred pikosekund to several tens of nanoseconds, where the normal PN diodes is 100 NS to a few microseconds.

Typical applications of Schottky diodes

Schottky diodes are used in many specific applications using their unique settings. Typical applications are those items are impulse converters. Low voltage conductivity and quick recovery time, increase performance of the power supply. Given the low voltage drop is also used to connect redundant power supplies, and as the rectifying diodes in the switching converters. Due to the high current density, these elements-they are also systems surge protection on the sensor inputs of the chip.