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LZ2A010KC

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LZ2A010KC 数据手册

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:

L_e= L_ox K_tx K_r-------- (1)

Where:

L_e= Expected life at operating temperature T_e(h)

L_o= Specified life at temperature operating temperature T_o(h)

K_t= Ambient temperature acceleration term

K_r= Ripple current acceleration term

(T_o-T_e)/10

K_t= L_ox A

-------- (2)

Where:

T_o= Maximum rated operating temperature (qC)

T_e= Actual ambient temperature (qC)

A = Acceleration coefficient (for the range from 35qC to the maximum operating temperature,

A|2)

(-'T/5)

K_r= 2

-------- (3)

Where:

'T = An increase in core temperature by internal heating due to ripple current

('T = core temperature – ambient temperature)

'T can be estimated as follows:

'T = (I²x R)/(E x S) -------- (4)

Where:

I = Ripple current of the capacitor (A rms)

R = Equivalent series resistance of the capacitor (:)

E = Heat radiation coefficient of the aluminum can (W/qC x cm²)

S = Surface area of the capacitor (cm²)

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

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