Four major characteristics of Schottky diodes
Schottky diodes are indispensable electronic components. Due to their important role in short-circuit protection, they are particularly indispensable. As we all know, when selecting a Schottky diode, the key is to look at its forward conduction voltage drop and reverse conduction voltage. Resistant to pressure, reverse leakage current, etc. But we rarely know how it is related to different currents, different reverse voltages, and different ambient temperatures. Knowing this relationship in circuit principles seems extremely important for choosing a diode that suits you, especially on the output power circuit board. Understanding its performance will make us more comfortable in our applications. The following article will take you to explore the characteristics of mysterious diodes. 但是我们其实很少了解它在不一样电流、不一样反向电压、不一样环境温度中的关联是怎么样的，在电路原理中知道这个关联对选择适合自己的二极管看起来极其重要，尤其是在输出功率电路板上。了解其性能，对我们的应用也更游刃有余，下边本文带您你一起去探寻神秘二极管特点。 正方向导通压降与导通电流之间的关系 在肖特基二极管两边加正方向偏置电压时，其内部结构静电场地区变小，能够有非常大的正方向蔓延电流根据PN结。 只有在正向电压做到某一标值(这一标值称之为“门坎工作电压”，锗管大约为0.2V，硅管大约为0.6V)之后，二极管才能做到真正导通。 但肖特基二极管的导通压降是稳定永恒不变的吗?它和正方向蔓延电流又存有什么样的关系?根据下面的图的检测电源电路在常温对型号规格为SM360A的二极管开展导通电流与导通压降的关系测试，可获得所显示的线条相互关系：正方向导通压降与导通电流正相关，其波动压力差为0.2V。 从负载导通电流到额定值导通电流的压力差虽仅是0.2V，但是对于输出功率肖特基二极管而言它会严重影响高效率还会影响肖特基二极管的温度，因此在价钱有条件的话下，尽量选导通压降小、额定值工作中电流较具体电流高一倍的肖特二极管。
Schottky diodes are indispensable electronic components. Due to their important role in short-circuit protection, they are particularly indispensable. As we all know, when selecting a Schottky diode, the key is to look at its forward conduction voltage drop and reverse conduction voltage. Resistant to pressure, reverse leakage current, etc.
But we rarely know how it is related to different currents, different reverse voltages, and different ambient temperatures. Knowing this relationship in circuit principles seems extremely important for choosing a diode that suits you, especially on the output power circuit board. Understanding its performance will make us more comfortable in our applications. The following article will take you to explore the characteristics of mysterious diodes.
The relationship between forward voltage drop and conduction current
When a forward bias voltage is applied to both sides of the Schottky diode, its internal electrostatic field area becomes smaller, and a very large forward current can flow through the PN junction.
Only after the forward voltage reaches a certain value (this value is called the "threshold operating voltage", which is about 0.2V for germanium tubes and about 0.6V for silicon tubes), can the diode truly conduct.
But is the conduction voltage drop of the Schottky diode stable and eternal? What is its relationship with the forward current? According to the detection circuit in the figure below, the diode model SM360A is conductive at room temperature. Testing the relationship between the conduction current and the conduction voltage drop, the relationship between the displayed lines can be obtained: the positive direction conduction voltage drop is positively related to the conduction current, and the fluctuation pressure difference is 0.2V.
Although the pressure difference from the load conduction current to the rated conduction current is only 0.2V, for the output power Schottky diode it will seriously affect the high efficiency and the temperature of the Schottky diode, so the price is Under certain conditions, try to choose a Schott diode with a small conduction voltage drop and a rated operating current that is twice as high as the actual current.
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