SDUR520

The SDUR520 is a high-performance single-phase ultrafast soft recovery diode from STMicroelectronics. It is designed for high frequency, high efficiency and extremely low forward voltage applications.

The design of the SDUR520 allows for greater levels of efficiency and operational stability in rectifying and switching applications. Compared to its predecessors, this device is an improvement in power dissipation and operating temperature range, making it suitable for applications like solar inverters and LED lighting.

Applications

The SDUR520 is an ideal choice for demanding applications involving high frequency operation and high voltage/current clamping. Examples of such applications include:

• Power lines rectifiers and snubbers
• High-voltage TV surge protection
• Lighting systems
• Solar inverters
• Switched mode power supplies
• High frequency switching circuits

Working Principle

The SDUR520 is a precision rectifying diode, intended to provide fast and soft-recovery action during current surges. It features an extended temperature range, as compared to its predecessors and improved power dissipation.

The device is composed of two diodes connected in anti-parallel configuration. When forward-biased, the device allows current to flow freely. When reverse-biased, the negative rail will be less than the positive, allowing a high-voltage differential to safely travel through the diode, while the current is blocked. During the reverse-bias condition, the diode conducts a low reverse recovery, which results in low surge currents, improved efficiency, and generator stability.

The reverse recovery time of the SDUR520 also depends on its capacitance. This capacitance is very low, reducing the total reverse recovery time. Thus, it allows the device to switch faster than average rectifiers, making it better suited for high frequency applications.

Conclusion

The SDUR520 is a high-performance single-phase ultrafast soft recovery diode from STMicroelectronics. It is designed to offer high levels of efficiency, operational stability, and power dissipation in rectifying and switching applications. Its extended temperature range and improved power dissipation make it an ideal choice for demanding applications involving high voltage/current clamping and high frequency operation.