What is a Schottky Diode?

Encyclopedia
07/15/2024


What is a Schottky Diode?


Schottky Diode definition


The reverse recovery time is extremely short (can be as small as a few nanoseconds), the positive pilot voltage drop is only about 0.4V, and the rectification current can reach thousands of amps, which can be used as a switching diode and a low-voltage high-current rectifier diode.


Schottky Diode structure


It is formed by connecting doped semiconductor regions (usually N-type) with metals such as gold, platinum, titanium, etc. The formation is not a PN junction, but a metal-semiconductor junction.


Schottky Diode equivalent circuit


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Schottky Diode main parameters


  • Reverse voltage

  • Forward current

  • Forward voltage

  • Leakage current

  • Junction capacitance

  • Recovery time


Schottky Diode advantages and disadvantages


Advantage


Low forward voltage, high speed switching, low noise, low power consumption


Shortcoming


The leakage current is large and the reverse voltage is low


Schottky diode selection


The type of Schottky diode to be selected should be determined according to the voltage VO, current IO, heat dissipation, load, installation requirements, and temperature rise required by the switching power supply.


Schottky diode applications


  • Used to protect the voltage regulator circuit against the accidental application of reverse polarity at the input

  • Provides a return path when the switch is off


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