Futurewafer's NVCS TVS series Transient Voltage Suppressor (TVS) Diodes feature avalanche and fast recovery characteristics. The clamping ratio between breakdown voltage and maximum clamping voltage is very low. This low clamping ratio provides lower clamping voltage at higher peak pulse currents compared to traditional TVS, allowing designers to use capacitors. The operating voltage is low, and the switching components include polarity protection diodes, load switch MOSFETs, Voltage stabilizing IC etc.
In addition, NVCS TVS have a very stable breakdown voltage over a wide operating range of - 55 -°C to + 150 -°C. stable. NVCS TVS operating characteristics enable POE and industry standard testing and rigorous operation of circuit network power state. This article explains IDEAL TVS, describes its advantages over traditional TVS, and outlines typical applications. Futurewafer has released four IDEAL
voltage-resistant 58-V high-power TVS including 2-KW, 3-KW, 5-KW and 7-KW.
PSE surge protection application
The currents as drawn in Figure indicate a positive surge from the surge generator while, in actuality, the PSE will be subjected to five positive and five negative surges according to the IEC 61000-4-5 test procedure. It should be noted that the surge current paths within each circuit block can vary depending on the surge polarity. For example, during a positive surge some surge current will flow through the port TVS to the positive rail of the 48-V power supply, and during a negative surge some surge current will flow through the body diode of the port MOSFET.
The PSE controller block includes an EMI filter, which is normally required to meet conducted emissions requirements. This filter typically employs ferrite beads or a common-mode choke, which can help to lessen the amount of surge current flowing back to the converter. The PSE controller block is also shown to include a 58-V TVS that is typically placed across the port to protect against hot-plug transients and ESD events. This TVS device will also contribute to the protection of the PSE controller during a lightning surge.
