RUSBF090

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PTC resettable fuses are becoming increasingly popular for their numerous advantages over traditional fuses in terms of size, protection and reset characteristics. The most common of these fuses is the RUSBF090, which provides an optimal surge protection for LED lighting systems. This article will delve into the application field and working principle of this versatile PTC fuse.

RUSBF090 is a UL94V-0 rated, 0.9A PTC resettable fuse that is designed to limit inrush current and protect systems from transient overvoltage. It is often used in LED lighting, automotive electronics, USB port, battery charging and power monitoring systems, as well as other industrial and commercial applications. The fuse has a wide operating temperature range from -40°C to +125°C and is available with both 1 and 2 pin headers.

The RUSBF090 can work in parallel with other components in a system in order to prevent failure due to critical failure when the individual components reach their upper thermal limits. The fuse is also designed to be self-limiting and will not allow the current to exceed its specified rating. This ensures that the system will remain safe from any over-voltage scenarios, even if the voltage exceeds the maximum rating of the components.

The working principle of the RUSBF090 is based on a PTC thermistor, which is triggered when the current reaches its maximum value. When the current reaches this value, a voltage is applied to the thermistor which turns into a temperature-dependent resistor. This resistance reduces the current to an acceptable level, thus protecting the system from over-current. Standard recovery time for the fuse is under 1000µS, making it suitable for fast-changing load requirements.

In addition to surge protection, the RUSBF090 also offers built-in delayed reboot protection. This feature allows the system to remain powered-off until the thermistor cools down to its reset temperature. This feature keeps the system from restarting too quickly, thus protecting the system against further damage from unexpected current surges.

Finally, the RUSBF090 allows for adjustable parameters such as current and time delay, and provides a short-circuit output signal when triggered. This feature is useful in applications where precise current measurements are required. The fuse is also designed to be encapsulated by epoxy resin or an adhesive tape, allowing it to be integrated into most application-specific designs.

In conclusion, the RUSBF090 PTC resettable fuse is suitable for a variety of applications. It provides an optimal surge protection for LED lighting systems, and can also be used in industrial and commercial applications where current and time delay adjustments are often needed. The fuse offers a wide operating temperature range and is UL94V-0 rated, making it a reliable and cost-effective solution.

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