1N2815B

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1N2815B is a zener diode used in a wide range of applications. It has a large maximum current rating and low reverse leakage current, making it suitable for use as a reverse bias diode. This article will discuss the application field and working principle of the 1N2815B.

Application Field: 1N2815B is most commonly used in power supply applications. It can be used as the main regulator in a linear power supply (LPS), in series with the output capacitor of a switched-mode power supply (SMPS), or as a voltage reference in an integrated circuit (IC). It can also be used as an electronic switch, stabilizing the supply voltage in circuits where the input voltage may fluctuate. It is often used in automotive and aerospace applications, where its robust design makes it suitable for a wide range of environmental conditions.

Working Principle: The working principle of the 1N2815B is basic zener diode behavior. When it is reverse-biased, the electric field produced by the voltage difference between the anode and cathode causes electrons to be thermionically emitted from the cathode, producing a “space charge” of electrons between the two terminals. This space charge prevents the diode from conducting current in the reverse direction, limiting the maximum voltage across it. This is the so-called “zener effect”. When the reverse bias voltage exceeds the rated breakdown voltage, defined as the “zener voltage”, the diode starts to conduct, allowing current to flow in the reverse direction.

In addition to the standard behaviors of a zener diode, the 1N2815B is designed to handle high currents and has a low forward voltage drop, making it ideal for power supply applications. The forward voltage drop is typically 200 mV, with a maximum drop of 1 V at 1.5 A. The high current rating of 1.5 A combined with the low voltage drop make the 1N2815B suitable for buck, boost, and flyback converters. The reverse leakage current is also low, typically 2 µA, which helps reduce power dissipated in the diode.

In summary, the 1N2815B is a zener diode suitable for use in power supply applications, such as buck, boost, and flyback converters. It has a low voltage drop and the ability to conduct high currents, as well as a low reverse leakage current. This makes it ideal for use in automotive and aerospace applications where a rugged and reliable part is needed.

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