色亚洲激情I特级黄录像视频I国产成人精品一区在线I91大神dom调教在线观看I日韩系列I蜜臀av性久久久久蜜臀aⅴ四虎I91最新在线视频

Hotline: 0755-26888837
Contact

Shenzhen Mario tronics co.,Ltd


ADD:Shenzhen City, Qianhai Shenzhen Hong Kong cooperation to the former Bay Road No. 1 building 201 A

A-mail: 26888837@mariotro.com


Problems needing attention in the process of using tantalum capacitors

Source:未來電子    Author:Admin    Visit:2    Pubtime:2016-09-10 11:54:20

When the tantalum capacitor is installed on the PCB board, under the mechanical stress, when the tantalum capacitor installation is not at that time, it is easy to lead the lead to bear large stress or resonance.

 

The following should be taken into account when selecting and using a tantalum capacitor:

A) circuit designers in order to design a circuit that can be satisfied with the work within the time required, the capacity of the capacitor to be used must be considered. Dielectric absorption; capacitance and pressure, vibration and shock; capacitance in the circuit aging and storage conditions.

B) to take into account the capacitance between the terminal and the capacitor, if this capacitance will produce stray capacitance and leakage current.

C) can be used in combination with a variety of capacitors to obtain the required amount of capacitance, and thus the amount of compensation capacity - temperature characteristics, etc..

D) the peak voltage applied to the capacitor can not exceed the specified value of the corresponding specification. Usually, the same peak voltage may be decreased due to the following conditions: aging; temperature rise; medium voltage region increases; high frequency; moisture into the capacitor. One point to be stressed is that don't ignore the short term transient voltage in the application.

E) when the capacitor is higher than the ground potential under high pressure condition, and to adopt additional insulation insulation, a capacitor terminal connected to the shell, because the capacitance and voltage distribution depends on between the capacitor core and shell and the capacitance between the casing and the chassis.

F) the peak current of charge and discharge must be considered according to the time constant of the circuit.

G) must consider internal heat and ambient temperature.

H) must consider the influence of humidity, pressure, corrosion resistance, mold, vibration and shock and other environmental factors.

I) must consider the insulation resistance, especially in the high temperature insulation resistance.

J) when working in series in a DC circuit, a balanced resistor must be considered.

K) the effective inductance of a large capacitance capacitor can be reduced by a parallel capacitor.

L) because the capacitor has an inductance, it is possible to generate instantaneous oscillation in parallel in each work or instantaneous operation of the circuit.

Poor electrical contact in low voltage M may open or produce noise.

N) the energy stored in the capacitor is dangerous to people and equipment, and the appropriate precautions should be taken.

O) filled with liquid capacitors can not be inverted, because it will lead to internal corona.

P) non - air sealed capacitors may be affected by "breathing".

Tantalum capacitor dielectric oxide film has a unidirectional conductivity and rectification characteristics, when the reverse voltage is applied, there will be a lot of current through, and even cause a short circuit failure. Therefore, the reverse voltage should be strictly controlled in the application. Solid electrolyte tantalum capacitors are generally not allowed to add reverse voltage, and can not be used in pure AC circuit for a long time. If in no circumstances, allow the reverse voltage applied amount in a short period of time, its value is below 25 DEG C: less than 10%UR or 1V (for small) 85 degrees less than or equal to 5%UR or 0.5V (for small) 125 degrees less than or equal to 1%UR or 0.1V (for small). If the capacitor is used in a circuit with reverse voltage for a long time, the use of bipolar tantalum capacitors, but also can only be in the polarity of the DC or pulse circuit frequency is not too high.

Non solid electrolyte tantalum capacitors are in the factory before the test, there is no problem of welding, the machine does not need to pre processing. If necessary (if stored for more than two years, or damp, or by acid gas pollution, etc.) can be used for tin treatment. Fully sealed solid tantalum capacitors, whether it is welding, or dip tin treatment, processing distance should be controlled in the technical specifications of the 3.2mm outside the sealing tin package, the temperature is not higher than 260 degrees, the time is not more than 5 seconds. Because the sealing material sealed solid tantalum capacitor is solder, if the time is too long, the temperature is too high or too close, body welding distance is less than 3.2mm, are likely to cause the sealing tin melting, lead capacitor humidity, seal, affect the electrical performance and reliability; serious, electric heated container internal negative pressure, the the seal cavity is caused by inhalation of solder, redundances and short circuit. For tantalum capacitor tin dipping treatment, at rated voltage and 85 DEG C aging 4 ~ 8 hours, and then measure the electrical properties (bipolar product per hour commutation time, leakage current should also be two directions were measured).

Tantalum capacitors can be stored for 14 years (except for welding), but storage for more than 2 years or dip tin tantalum capacitors, rated voltage is applied, the internal resistance of the power supply before the use of less than 3 ohm.

Tantalum capacitors should be used to avoid over temperature. High temperature will make the material properties change, due to a variety of thermal products with different coefficients of expansion, may produce internal stress due to product failure; long time storage at high temperature, the product may be produced due to internal stress failure. Therefore, the tantalum capacitor must be used in the temperature range of the standard.

The failure rate of the tantalum capacitor is the difference of the DC rating (85 C, rated voltage), and due to the different conditions (ambient temperature, applied voltage, circuit resistance, etc.). In the actual circuit, the voltage or current is often the peak impulse and ripple current, or other unexpected electric shock, so the actual use of the drop design is necessary. Proposed general down to 65%UR below, so as to ensure that the product and the complete line. When the ambient temperature is greater than 85, the amount of the reduction should be considered in the third article.


Non solid electrolyte tantalum capacitors in wet PH test before the leak should fully discharge, otherwise it will be due to incomplete discharge of the capacitor to the contact strip and the capacitor anode is red; the contact strip and the capacitor cathode is blue LED

主站蜘蛛池模板: 国产精品成人在线 | 爱爱视频在线观看 | 国产 字幕 制服 中文 在线 | 亚洲欧洲∨国产一区二区三区 | 国产高清在线观看av | 国精产品一区一区三区 | 91人人草| 日韩精品毛片无码一区到三区 | 夜夜夜爽bbbb性视频 | 国产区视频在线观看 | 又紧又大又爽精品一区二区 | 狠狠色婷婷久久综合频道日韩 | 亚洲国产区男人本色vr | 国产精品9999久久久久仙踪林 | 亚洲一区二区综合 | 91视频丝瓜 | 色婷婷视频在线观看 | 成人在线免费观看 | 梦中人在线观看免费完整版 | 日韩免费视频播播 | 欧洲精品免费一区二区三区 | 一区二区三区不卡免费视频97 | 黑人大荫蒂老太大 | 97热久久| 99国产精品久久久 | 亚洲人成在线观看一区二区 | 成人亚洲精品久久久久软件 | 天堂а在线中文在线新版 | 日韩亚av无码一区二区三区 | 五月开心播播网 | 女人被狂躁60分钟视频 | 无码丰满少妇2在线观看 | 成人精品网站在线观看 | 色网站免费在线观看 | 国产精品久久av | 久久美女网 | 九九免费在线视频 | 日韩中文字幕一区二区三区 | 锵锵锵锵锵锵锵锵锵好湿好大 | 97在线观看视频 | 三级精品 | 国产精品国产三级国产aⅴ入口 | 香蕉视频日本 | 成人h动漫精品一区二区 | 欧美视频在线观看一区二区 | 亚洲精品久久久口爆吞精 | 2021无码最新国产在线观看 | 久久一 | 亚洲国产精品悠悠久久琪琪 | 丰满熟妇人妻中文字幕 | 免费视频二区 | 少年班江依琳 | 久久精品视频在线观看 | 久久人人爽爽人人爽人人片av | 欧美大香线蕉线伊人久久 | 国产精品久久久久久久久久久久冷 | 久久精品一 | 中文无码伦av中文字幕 | 国产精品免费久久久久影院 | 韩国美女一区二区 | 五月天激情视频 | 色爱综合网 | 国产伦孑沙发午休精品 | 97影院在线午夜 | 国产乱在线观看视频 | 国产 日韩 欧美 高清 | 国产一区在线看 | 精品一区二区成人精品 | 免费99精品国产自在在线 | 小蝌蚪污视频 | 香蕉伊蕉伊中文视频在线 | 永久免费不卡在线观看黄网站 | 五月激情六月婷婷 | 一个人看aaaa免费中文 | 在线播放亚洲第一字幕 | 久久久久久欧美精品se一二三四 | 邻居少妇张开双腿让我爽一夜 | 免费一级做a爰片性视频 | 国产免费又爽又色又粗视频 | 91免费在线看 | 四虎国产精品永久在线观看 | 中文字幕久热精品视频在线 | 片一级片在线观看 | 精品国产一区二区三区四区vr | 一区二区三区四区亚洲 | 国产爆操 | 欧洲精品成人免费视频在线观看 | 欧美交换配乱吟粗大25p | 欧美精品免费xxxxx视频 | 91视频完整版 | www.天天操| 黄瓜视频在线观看 | 中文字幕无码精品亚洲资源网久久 | 精品亚洲一区二区三区 | 午夜视频在线观看网站 | 国产中文字幕久久 | 91在线视屏 | 日本免费三级网站 | 国产成人无码18禁午夜福利p |