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CS1V221KT Datasheet(PDF) 13 Page - DB Lectro Inc |
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CS1V221KT Datasheet(HTML) 13 Page - DB Lectro Inc |
13 / 13 page 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: Le = Lo Kt Kr -------- (1) Where: Le = Expected life at operating temperature Te (h) Lo = Specified life at temperature operating temperature To (h) Kt = Ambient temperature acceleration term Kr = Ripple current acceleration term Kt = Lo A -------- (2) (To-Te)/10 Where: To = Maximum rated operating temperature ( C) Te = Actual ambient temperature ( C) A = Acceleration coefficient (for the range from 35 C to the maximum operating temperature, A 2) Kr = 2 -------- (3) (- T/5) 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 = (I 2 R)/( S) -------- (4) Where: I = Ripple current of the capacitor (A rms) R = Equivalent series resistance of the capacitor ( ) = Heat radiation coefficient of the aluminum can (W/ C cm 2) S = Surface area of the capacitor (cm 2) 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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