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ST20100 Application Field and Working Principle

The ST20100 is a single silicon diode that is commonly used for rectification in alternating current (AC) to direct current (DC) power supplies and voltage regulation. This diode can handle hundreds of volts and is designed with an automated connection to a printed circuit board (PCB). The ST20100 is typically used for rectifying AC power to DC, or in some cases, to voltage regulate or provide zero voltage switching of AC lines.

The ST20100 is a single diode, meaning it comprises only of a single P-N junction, which would either conduct or block current depending upon the polarity of voltage. Depending upon the configuration, it can perform rectification or voltage regulation. The diode has a junction capacitance of 2.34 pF and a reverse recovery time of 690 ns. It can handle up to 200 volts in forward and reverse directions and can effectively handle maximum peak current of 15 amperes. The diode does not require an external bypass capacitor, which is necessary for most other diodes in this configuration.

Application Fields

The ST20100 is used mainly as a rectifier in AC/DC power supplies, such as those found in computers, televisions, automobiles and cell phones. It is also used for voltage regulation in many types of power supplies. The diode is often used in AC line switching applications, where it provides quick on/off cycling with negligible power consumption. The diode is also used to convert switching power supplies from AC to DC. In addition, the ST20100 can be used in low-frequency power converters, DC motor drives and other AC-powered systems.

Working Principle

The ST20100 is a rectifier diode, meaning it is designed to convert AC current into DC current. A rectifier diode is a single p–n junction that conducts current in one direction, while blocking current in the opposite direction. The diode has a threshold voltage level of around 0.7 volts. When an AC voltage is applied across the diode, it will conduct current as long as the input voltage exceeds the threshold voltage. All voltage values below this threshold will be blocked by the diode. This rectification process effectively converts AC to DC.

The ST20100 also has a second function for AC line switching. its fast reverse recovery time makes it effective for switching on and off AC lines. When an AC voltage is applied across the diode, the drain on it inhibits the current from flowing until a point is reached where the threshold voltage is exceeded. As soon as the threshold voltage is reached, the diode will quickly switch on, allowing current to flow until the voltage drops back below the threshold. This can effectively be used to switch AC power lines on or off quickly, with negligible power consumption.

Conclusion

The ST20100 is a single silicon diode used mainly for rectification and line switching of AC power. The diode can handle up to 200 volts in both directions, allowing it to be used in many AC/DC power supplies and voltage regulation applications. The diode is also ideal for switching AC lines on and off quickly, with no power dissipation or energy losses. With its fast reverse recovery time and low junction capacitance, the ST20100 is a reliable and efficient rectifier diode for many kinds of applications.

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