V480LU80CP

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A varistor, or variable resistor, is a device used to limit excessive voltage by either short-circuiting or providing a low-impedance path to ground. TVS Varistors, MOVs, such as the V480LU80CP, are mainly used in applications that require protection from lightning and other fast transients. This article will outline the application field and working principle of the V480LU80CP.

Applications

The V480LU80CP is a unidirectional transient voltage suppressor (TVS) designed to protect sensitive electronic components of electrical circuits. This device is most commonly used in consumer electronics, such as in mobile phones and tablets, as well as in automotive systems, embedded systems, and industrial and power systems. In telecommunications, these devices are used to protect sensitive equipment from impulse voltage caused by lightning and other antenna-transmitted signals.

The V480LU80CP has its own specific operating characteristics. It comes with a wide operating temperature range from -55℃ to 175℃ and a voltage operating range from 5V to 480V. The maximum peak pulse power capability of this TVS is 8kW, with a peak pulse current of 20A at an 8/20μS pulse. The device has low thermal resistance, fast response time, and large standoff voltage.

Working Principle

The V480LU80CP is composed of two components: a junction temperature controlling Zener diode and a solid-state metal-oxide varistor (MOV). When an excessive voltage is encountered, the Zener diode conducts, and the MOV dissipates the surge energy by increasing its resistance and providing a low-impedance path to ground. This helps to reduce the voltage across the devices and limit the current.

The MOV is composed of segments of semiconductive ceramic material with an applied heavy layer of metal-oxide. Under normal conditions, the MOV acts as an insulator. When high voltage is present, heavy electrical current will flow and the MOV will start conducting. The current is then diverted through the MOV to the ground terminal, allowing the main circuit to remain safe from over-voltage events. The MOV becomes non-conductive when the voltage returns to normal.

The Zener diode is used as a temperature control element. When the junction temperature exceeds its specified limit, the Zener will be triggered and conduct. This will limit the voltage across the device and protect any sensitive components connected to it. The Zener diode will reset once the junction temperature falls below its specified threshold.

Conclusion

The V480LU80CP is a unidirectional transient voltage suppressor designed to withstand fast transient voltages and protect sensitive electronic components. It operates within a wide voltage range, has a low thermal resistance, and offers fast response time. The device is composed of two components: a Zener diode and an MOV, which work together to reduce the voltage across the devices and provide a low-impedance path to ground in excessive voltage conditions.

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