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SR215E104MAA 参数 Datasheet PDF下载

SR215E104MAA图片预览
型号: SR215E104MAA
PDF下载: 下载PDF文件 查看货源
内容描述: Multiayer陶瓷电容器引线 [Multiayer Ceramic Leaded Capacitors]
分类和应用: 电容器陶瓷电容器
文件页数/大小: 71 页 / 1094 K
品牌: KYOCERA AVX [ KYOCERA AVX ]
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The Capacitor  
GENERAL INFORMATION  
Potential Change – A capacitor is a reactive  
component which reacts against a change in potential  
across it. This is shown by the equation for the linear  
charge of a capacitor:  
A
capacitor is  
a
component which is capable  
of storing electrical energy. It consists of two conductive  
plates (electrodes) separated by insulating material which is  
called the dielectric. A typical formula for determining  
capacitance is:  
dV  
Iideal  
=
C
dt  
where  
I = Current  
.224 KA  
C =  
t
C = Capacitance  
dV/dt = Slope of voltage transition across capacitor  
C = capacitance (picofarads)  
K = dielectric constant (Vacuum = 1)  
A = area in square inches  
t = separation between the plates in inches  
(thickness of dielectric)  
Thus an infinite current would be required to instantly  
change the potential across a capacitor. The amount of  
current a capacitor can “sink” is determined by the  
above equation.  
Equivalent Circuit – A capacitor, as a practical device,  
exhibits not only capacitance but also resistance and  
inductance. A simplified schematic for the equivalent  
circuit is:  
.224 = conversion constant  
(.0884 for metric system in cm)  
Capacitance – The standard unit of capacitance  
is the farad. A capacitor has a capacitance of 1 farad  
when 1 coulomb charges it to 1 volt. One farad is a very  
large unit and most capacitors have values in the micro  
(10-6), nano (10-9) or pico (10-12) farad level.  
RP  
Dielectric Constant – In the formula for capacitance  
given above the dielectric constant of a vacuum is  
arbitrarily chosen as the number 1. Dielectric constants  
of other materials are then compared to the dielectric  
constant of a vacuum.  
L
RS  
C
C = Capacitance  
L = Inductance  
Dielectric Thickness – Capacitance is indirectly propor-  
tional to the separation between electrodes. Lower volt-  
age requirements mean thinner dielectrics and greater  
capacitance per volume.  
Rs = Series Resistance  
Rp = Parallel Resistance  
Reactance – Since the insulation resistance (Rp)  
is normally very high, the total impedance of a capacitor  
is:  
Area – Capacitance is directly proportional to the area of  
the electrodes. Since the other variables in the equation  
are usually set by the performance desired, area is the  
easiest parameter to modify to obtain a specific capaci-  
tance within a material group.  
Z = RS2 + (XC - XL )2  
ͱ
where  
Z = Total Impedance  
Rs = Series Resistance  
XC = Capacitive Reactance =  
Energy Stored – The energy which can be stored in a  
capacitor is given by the formula:  
1
2 π fC  
XL = Inductive Reactance = 2 π fL  
E = 1⁄ CV2  
2
The variation of a capacitor’s impedance with frequency  
determines its effectiveness in many applications.  
E = energy in joules (watts-sec)  
V = applied voltage  
C = capacitance in farads  
Phase Angle – Power Factor and Dissipation Factor are  
often confused since they are both measures of the loss  
in a capacitor under AC application and are often almost  
identical in value. In a “perfect” capacitor the current in  
the capacitor will lead the voltage by 90°.  
2
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