Schottky Diode Characteristics and Applications

16 Dec.,2024

 

Schottky Diode Characteristics and Applications

Schottky diodes are used for their low turn-on voltage, fast recovery time and low-loss energy at higher frequencies. These characteristics make Schottky diodes capable of rectifying a current by facilitating a quick transition from conducting to blocking state. Therefore, Schottky diodes are often an ideal choice for semiconductor devices in many applications. Here are five of the most common applications for Schottky diodes.

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Radio frequency mixer and detector diode applications

Schottky diodes have high switching speeds and high-frequency capabilities, which make them well-equipped for use in radio frequency applications. Additionally, Schottky diodes have various metal-semiconductor junction configurations, making these semiconducting devices useful in power detector or mixer circuits.

Power rectifier applications

Schottky diodes are the best semiconductor devices to use in power rectifier applications because these devices have both a high current density and low forward voltage drop (e.g., 1.27V@25°C, 1.37V@175°C for the C6DA for the 650-V, SiC Schottky diode), unlike the characteristics of ordinary PN junction devices. These advantages contribute to lower heat levels, smaller heat sinks included in the design, and an overall increased efficiency of the electronic system.

Power or circuit applications

Schottky diodes can be used in applications where current is generated by two parallel power supplies. The characteristics of a Schottky diode make them well-adapted for use in power or circuit applications because of their low forward voltage drop. The presence of these diodes also prevents reverse current flow from one supply entering the other.

Solar cell applications

Solar cells are often connected to rechargeable batteries to store energy because the sun is not available as an energy source 24 hours a day. SiC Schottky diodes prevent the batteries from discharging through the solar cells at night and prevent high-performing solar cells from discharging through lower-performance solar cells.

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Clamp diode applications

Schottky diodes are used as switches in fast-clamp diode applications. In this application, the base junction is forward biased. With Schottky diodes, the turn-off time is significantly reduced and the speed of the circuit is increased.

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power supply - How do the protection diodes actually ...

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Regarding making a dual supply from two single supplies, I see two Schottky diodes are placed between the supply terminals in reverse biased way as in the following example I drew. The diodes are randomly chosen by me just for illustration, so they might not be sized correctly:

The reasoning behind using such diodes is given as: "The diodes also prevent possible reverse voltage damage if one power supply is off while the others are on."

When I remove PSU1 in the above schematic or make its voltage to zero and simulate it, I don't see any difference such as excessive current etc. I have spent several hours searching for a detailed explanation but couldn't find any.

Can someone show how in a scenario the diodes protect the supplies by maybe simulating or if not by showing the routes of the currents?

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