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To understand how to distinguish between transient diodes
Publish：SHENZHEN ENXIC ELECTRONICS CO., LTD,Schottky diodes, rectifier diodes, fast recovery diodes, switching transistors, thermistors, MOS tube, TVS tube, Youze Electronics Time：2018-03-07 Views:1745
Transient diode, referred to as TVS, is a diode type high efficiency protection device. When the two poles of the TVS diode are subjected to the inverse transient high energy shock, it can change the high impedance between the two poles to a low impedance at 10 minus 12 seconds, and absorb the surge power of up to several kilowatts, so that the voltage between the two poles is clamped in one value and effectively protects the precision components in the electrical circuits from each other. The damage of the surge pulse.
It is widely used in data line protection, power line, automotive electronic products, motor, fire alarm equipment, electric flush device, laser diode protection, smoke detector, igniter, multi-function meter data path protection, power / signal secondary lightning protection module, electronic ballast / electronic stabilizer, AC/DC converter, charger and instrument. Instrument and so on.
Selection of transient suppression diode:
1, determine the maximum or continuous working voltage of the protected circuit, the rated standard voltage of the circuit and the "high end" tolerance.
2, TVS rated reverse turn off VWM should be greater than or equal to the maximum working voltage of the protected circuit. If the selected VWM is too low, the device may enter the avalanche, or the reverse leakage current is too large, which will affect the normal operation of the circuit. The serial connection is divided into voltage, parallel connection and current division.
3, the maximum clamping voltage VC of TVS should be less than that of the protected circuit.
4, in the specified pulse duration, the maximum peak power consumption PM of TVS must be greater than that of the peak power in the protected circuit. After determining the maximum clamping voltage, the peak impulse current should be larger than the transient surge current.
5, for the protection of data interface circuit, we must also pay attention to selecting TVS devices with suitable capacitance C.
6, choose polarity and packaging structure of TVS according to its purpose. It is more reasonable to choose bipolar TVS for AC circuit, and TVS array is more favorable for multi line protection.
7. The temperature is considered. Transient voltage suppressor can work in 55~+150 c.. If TVS is required to work at a changing temperature, because its reverse leakage current ID increases with the increase of the temperature, the power consumption decreases with the increase of TVS junction temperature, from +25 C to +175 C, the linear drop of 50% rain breakdown voltage VBR increases with a certain coefficient with the increase of temperature. Therefore, we must consult the relevant product information and consider the influence of temperature change on its characteristics.
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