CS2A100KC DBLECTRO [DB Lectro Inc], CS2A100KC Datasheet - Page 13

• Manufacturer Part Number: CS2A100KC
• Description: CHIP TYPE, STANDARD
• Manufacturer: DBLECTRO [DB Lectro Inc]

DB LECTRO Inc. 3755 Place Java, Suite 140, Brossard, Québec, J4Y 0E4, Canada - T: 1-450-444-1424 / F: 1-450-444-4714 / www.dblectro.com
LIFE OF ALUMINUM ELECTROLYTIC CAPACITORS
The life of aluminum electrolytic capacitors is mainly dependent on environmental conditions (e.g.
ambient temperature, humidity etc.) and electrical factors (e.g. operating temperature, ripple current
etc.) Generally, the wear-out mechanism of aluminum electrolytic capacitors is based on evaporation
of electrolyte through the rubber seal. Consequently, the factor of temperature (ambient temperature
and internal heating due to ripple current) is the most critical to electrolytic capacitors life. The effect of
voltage on capacitor life is negligible, especially for low voltage electrolytic capacitors. The lifetime of
aluminum electrolytic capacitors can be expressed as following equations:
Where:
Where:
Where:
Where:
T can be estimated as follows:
L
L
L
K
K
K
T
T
K
I = Ripple current of the capacitor (A rms)
R = Equivalent series resistance of the capacitor ( )
S = Surface area of the capacitor (cm
A = Acceleration coefficient (for the range from 35 C to the maximum operating temperature,
e
e
o
o
e
T = An increase in core temperature by internal heating due to ripple current
T = (I
t
r
t
r
= Heat radiation coefficient of the aluminum can (W/ C cm
= Ambient temperature acceleration term
= L
= L
= Expected life at operating temperature T
= Specified life at temperature operating temperature T
= Ripple current acceleration term
= 2
= Maximum rated operating temperature ( C)
= Actual ambient temperature ( C)
A 2)
( T = core temperature – ambient temperature)
o
o
(- T/5)
2
A
K
R)/(
(T
t
o
-T
K
e
r
-------- (3)
)/10
S) -------- (4)
-------- (1)
-------- (2)
2
)
e
(h)
o
(h)
2
)