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1N5518B Application Field and Working Principle

Zener diodes have been extensively used in a wide range of applications, from voltage regulation to protection from electric surges. The 1N5518B Zener diode is a general purpose Zener diode designed for use in many applications, including high voltage regulation, clamping, and voltage switching. The exact application and working principle of a Zener diode depends on its specific device, such as the 1N5518B.

Application Field

The 1N5518B Zener diode has a range of operating voltages ranging from 200 mV to 20V. This makes it suitable for a variety of applications, including stabilization in power supplies, over-voltage protection, and voltage regulation in high-voltage circuits. It can also be used in feedback loops to limit voltage levels, in switching circuits to provide electrical isolation, and as a voltage reference in DACs (digital-to-analog converters).

In addition to the above, the 1N5518B can also be used in oscillator applications, such as in the CLOCK and RESET oscillators in microprocessors and other digital devices. Since it can operate over most common temperature ranges, it can be used in temperature-sensitive applications, such as temperature sensing circuits, thermometers and thermostats. It is also suitable for other temperature-related applications, such as in thermostat-controlled heaters and cooling fans.

Working Principle

The 1N5518B is a Zener diode, which operates by reversing the current flow when its zener voltage is exceeded. In other words, when an external voltage greater than the zener voltage is applied to the diode, current flows through the reverse direction and the voltage drops to the breakdown voltage of the diode. The result is that the device acts like a two-way switch and can be used to regulate the voltage or limit surge currents.

Using the 1N5518B as a voltage regulator is quite simple. A resistor is placed between the input and output of the circuit, and a capacitor is also connected between these two points. The capacitor acts as a reservoir, and the resistor keeps the current flowing in the same direction. The voltage output is then regulated by the Zener diode, which will maintain the output voltage at the designed Zener voltage. As the capacitor discharges, the voltage will be automatically pulled back to the Zener voltage.

In the case of over-voltage protection, the 1N5518B works in a similar fashion, except that the output voltage is limited to the zener voltage, regardless of the input voltage. When the input voltage exceeds the zener voltage, current will flow through the diode and the output voltage will be set to the Zener voltage. This acts like a fuse and helps protect sensitive components from damage caused by excessive voltage.

The 1N5518B is a versatile Zener diode with a wide range of applications. Its Zener voltage and range of operating voltages make it suitable for a variety of applications, including voltage regulation, over-voltage protection and voltage switching.

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