参数资料
型号: DC-2R5E224U-E
厂商: Elna America
文件页数: 114/145页
文件大小: 0K
描述: CAP SUPER 220MF 2.5V COIN SMD
产品目录绘图: DC Series Front
DC Series Side
标准包装: 200
系列: DC
电容: 220mF
电压 - 额定: 2.5V
容差: -20%,+80%
ESR(等效串联电阻): 100 欧姆
寿命@温度: 70°C 时为 1000 小时
安装类型: 表面贴装
封装/外壳: 币形,细型端子 - 同侧
引线间隔: 0.079"(2.00mm)
包装: 散装
尺寸/尺寸: 0.268" 直径(6.80mm)
高度 - 座高(最大): 0.102"(2.60mm)
工作温度: -25°C ~ 70°C
产品目录页面: 1912 (CN2011-ZH PDF)
其它名称: 604-1006
?
ALUMINUM ELECTROLYTIC
CAPACITORS
TECHNICAL NOTE
) ) ) )
?
T T
× K
L = Lr × 2
………(5)
2-2 Estimation of life considering the ripple current.
The ripple current affects the life of a capacitor
because the internal loss (ESR) generates heat. The
generated heat will be :
0 ー
10 10
Where Lr : Life at the upper category temperature
???? with the rated ripple current (h)
P = I 2 R………………(2)
??
Δ T 0 : Temperature increase at capacitor core,
Where l : Ripple current (Arms)
????
at the upper category temperature (deg.)
Δ T = ………………(3)
) ) ) )
T T
0 ー I 2 Δ T 0
1 ー ×?
10 ……(6)
L = Lr × 2
× K
R  :  ESR  (Ω)
With increase in the temperature of the capacitor:
I 2 ? R
A ? H
Where Δ T : Temperature increase in the capacitor
core(deg.)
I : Ripple current (Arms)
R : ESR ( Ω )
A : Surface area of the capacitor (cm 2 )
H : Radiation coefficient (Approx. 1.5 ~ 2.0 ×
10 -3 W/cm 2 ×℃ )
The above equation (3) shows that the temperature of
a capacitor increases in proportion to the square of
the applied ripple current and ESR, and in inverse
(3) The life equation considering the ambient temper-
ature and the ripple current will be a conversion of
the above equation (5), as below :
10 I 0
Where l 0 : Rated ripple current at the upper category
??? ? temperature (Arms)
??? I : Applied ripple current (Arms)
Since it is actually difficult to measure the temperature
increase at the capacitor core, the following table is
provided for conversion from the surface temperature
increase to the core temperature increase.
Table 2-1
proportion to the surface area. Therefore, the amount
Case diameter
~10
12.5~16
18
22
25
30
35
of the ripple current determines the heat generation,
which affects the life. The value of Δ T varies de-
Core / Surface
1.1
1.2
1.25
1.3
1.4
1.6
1.65
pending on the capacitor types and operating condi-
tions. The usage is generally desirable if Δ T remains
less than 5 ℃ . The measuring point for temperature
increase due to ripple current is shown below ;
Measuring point
The life expectancy formula shall in principle be
applied to the temperature range between the ambient
temperature of + 40 ℃ and upper category
temperature. The expected life time shall be about
fifteen years at maximum as a guide in terms of
deterioration of the sealant.
(Table 2-1 Life Expectancy Chart)
130
1
2
85?C: 1000hour guaranteed
85?C: 2000hour guaranteed
125
8 9
10
11
12
3
4
105?C: 1000hour guaranteed
105?C: 2000hour guaranteed
5
105?C: 3000hour guaranteed
120
6
7
105?C: 5000hour guaranteed
105?C: 20000hour guaranteed
Test results:
(1) The life equation considering the ambient temper-
ature and the ripple current will be :
115
110
105
3
4
5
6
7
8
9
10
11
12
125?C: 1000hour guaranteed
125?C: 1250hour guaranteed
125?C: 2000hour guaranteed
125?C: 3000hour guaranteed
125?C: 5000hour guaranteed
100
) ) ) )
T T
0 ー ー Δ T
L = Ld × 2
× K ………………(4)
?
10 10
Where Ld : Life at DC operation (h)
???? K : Ripple acceleration factor
????
(K = 2, within allowable ripple current)
???? T 0 : Upper category temperature ( ℃ )
???? T : Operating temperature ( ℃ )
??? Δ T : Temperature increase at capacitor core
(deg.)
(2) The life equation based on the life with the rated
ripple current applied under the maximum guaranteed
95
90
85
80
75
70
65
60
55
50
45
1
2
temperature will be a conversion of the above equation
(4), as below :
h (10 3 h)
Year
2
5
1
10
20
3
50
5
100 131
10
15
175
NOTE
Design, Speci?cations are subject to change without notice.
Ask factory for technical speci?cations before purchase and/or use.
CAT.No.2008/2009E(2008.10.1)
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