亚洲天堂av一区二区I久久久.wwwI欧美成人三级I天堂网www在线I天天看天天操I色婷婷亚洲综合I久久婷色I99精品国产在热久久婷婷I亚洲色干I国产97在线视频I麻豆影音先锋I今天曰AAI6699嫩草久久久wwwI久久久婷婷综合国自产拍揄泬I9久国产I国产成人片Iigao久久I网友自拍咪咪爱

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: 九九夜| 蜜臀av色欲a片无码精品一区 | 欧洲熟妇色xxxx欧美老妇 | 久久99精品久久久久久小说 | 999国产精品视频免费 | 三级a午夜电影无码 | 性色av无码一区二区三区人妻 | 欧美黑人巨大videos精品男男 | 在线播放免费人成视频在线观看 | 特级做a爱片免费69 国产传媒av在线 | 成年人午夜视频 | 精品一区二区无码免费 | 亚洲欧洲无码av电影在线观看 | 高清毛茸茸的中国少妇 | 38激情 | 国产999精品2卡3卡4卡 | 操欧美老女人 | 亚洲精品久久久久久久久久久久久 | 人操人人| 成人免费无遮挡在线播放 | 毛片直接看 | 欧美不卡无线在线一二三区观 | 最新中文字幕第一页 | 亚洲综合成人网 | 欧美黑人又粗又大又爽免费 | 91丝袜呻吟高潮美腿白嫩在线观看 | 免费人成网站在线观看不 | 在线观看免费人成视频 | а√最新版在线天堂 | 无码中文av有码中文av | 欧美老熟妇videos极品另类 | 日本黄色一级 | 国产基佬gv在线观看网站 | 中文字日产幕乱五区 | 亚洲h在线播放在线观看h | 丁香色婷婷 | 高清国产一区二区三区在线 | 色老头av亚洲一区二区男男 | 久久奇米 | 亚洲第一女人av | 无遮挡又爽又刺激的视频 | 国内精品国产成人国产三级 | 国产成人综合久久久久久 | 激情的网站 | 高清在线一区二区 | 日日夜夜操视频 | 91色交视频| 欧美在线一级 | 中文字幕一区精品 | 亚洲色欲综合一区二区三区小说 | 毛片天堂 | 久久久久国产精品视频 | 亚洲国产欧美在线 | 国产情侣久久 | 亚洲区欧美| 国产精品色吧国产精品 | 日韩精品久久无码人妻中文字幕 | 国产情侣大量精品视频 | 一本色综合亚洲精品蜜桃冫 | 91亚洲专区 | 国产精品资源在线观看 | 精品一卡2卡三卡4卡乱码理论 | av字幕在线| 国产在线线精品宅男网址 | 久久精品中文字幕有码 | 性久久 | 久久婷婷国产 | 国产精品中文原创av巨作首播 | 免费香蕉成视频人网站 | 538prom精品视频在线播放 | 久久久久久妓女精品影院 | 色偷偷噜噜噜亚洲男人 | 超清制服丝袜无码av福利网 | 久久99精品久久久久久园产越南 | 婷婷久久综合九色综合97 | 在线精品一区二区三区 | 在线播放五十路熟妇 | a国产在线 | 国产成人精品午夜二三区波多野 | 国产国产精品人在线视 | 国产精品欧美福利久久 | 精品久久久久国产免费第一页 | 在线v片免费观看视频 | 神马午夜一区二区 | 柠檬福利第一导航在线 | 91插视频 | 欧美一区二区三区不卡视频 | 草草视频在线观看 | 国产精品线路一线路二 | 美国人性欧美xxxx | 色就是色综合 | 亚洲最大中文字幕 | 51精品国自产在线 | 亚洲欧美日韩综合一区在线观看 | www.199麻豆 | 中文无码vr最新无码av专区 | 黄色网址av| 久久精品在线观看 | 激情综合视频 |