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参数资料
| 型号： | DC-2R5E224U-E |
| 厂商： | Elna America |
| 文件页数： | 141/145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 |
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TECHNICAL NOTE
ELECTRIC DOUBLE
LAYER CAPACITORS
?
3 Calculation Method of Discharge Time
3-1 Approximating the Discharge Time of Basic
Constant Current Discharge
The discharge time at the constant current of a
capacitor can be calculated by the following
equation.
t = (C × Δ V)/I
Where,
3-3 Effect of IR Drop at Large Currents
When a large Current discharge and a capacitor with
a high internal resistance are used, the effect of IR
drop by the product of the internal resistance and the
current must be considered as shown in Fig.5.
When a large current is required in a very short time,
or a large instantaneous current flows at the start of
discharge, the voltage drop indicated with Δ V1 counts.
t
C
Δ V
I
:
:
:
:
Discharge time (sec.)
Capacitor capacitance (F)
Working voltage range (V)
Discharge current (A)
However, when the discharge continues as it is, the
discharge curve indicates in a manner showing a slow
diffusion and then keeps a constant straight line.
As an example, we calculate the discharge time when
a capacitor of the DB series 5.5V 1F is charged with
5V and discharged to 3V at a constant current of 1
mA. Since the working voltage range Δ V is 2V
from 5 ? 3V, t = (1F × 2V)/0.001A from the above
equation, and the discharge time can be calculated
as 2,000 seconds (about 33 minutes). Note that
the actual discharge time may be different because
We also make calculation including Δ V2 of the
intersection extending from the initial discharge and
the discharge straight line section including the
diffusion curve when indicating the DC internal
resistance.
this equation does not cover the effect of the
E
V 2
V 1
self-discharge and the IR drop by internal resistance
described below.
3-2 Effect of Self-discharge at Microcurrents
When backup is made by discharge with a micro-
current below some μA especially for the memory
backup application and the like, the discharge time
must be determined while taking into account the self-
discharge as shown in Fig.4.
Charge
Discharge
The value closer to the actual discharge curve is
obtained by adding the voltage drop through the self-
discharge determined from the voltage retention
characteristic test to the discharge curve given by
calculation.
Note that the value of self-discharge varies by
Fig.5 Example of Discharge Curve involving IR Drop
Due to IR drop, the shape of the discharge curve
varies by the internal resistance and ambient
temperature for each series.
the charge time, charging current and an ambient
temperature.
Discharge curve given by calculation
Actual discharge curve
Time
Fig.4 Example of Discharge Curve involving Self-Discharge
NOTE
CAT.No.2008/2009E(2008.10.1)
Design, Speci?cations are subject to change without notice.
Ask factory for technical speci?cations before purchase and/or use.
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