CD281LLH Datasheet, PDF (7/8 Pages) Jianghai Europe GmbH – 6 000 - 12 000h at 105°C

Life Time Estimation
3. K_V Voltage Factor: For Radial Electrolytic Capacitors, this part of the formula has no impact (K_V = 1). But for
some bigger capacitors like Snap-In and Screw-Terminal types with rated voltages above 350V, the operating
voltage will affect their Lifetime. It is expressed as follows:
( ) ^KV ⁼
U_A ^-n
U_R
Where:
U_R Rated Voltage
U_A Actual Operating Voltage
n Exponent, defined as:
0,5 ≤ ^UA ≤ 1 → n = 2,5
U_R
0 < ^UA
U_R
< 0,5 → n = 0
4. Frequency Correction Factors: If the actual Ripple Currents are not given at the same frequency like I₀,
weighing factors need to be applied.
I_A =
( ) ( ) ( ) ^If1
2
+
F_{f 1}
I_{f 2}
2
+ ^...
I_{f n}
2
F_{f 2}
F_{f n}
I_A
I_f1 ... I_fn
F_f1 ... F_fn
Actual Rated Ripple Current (normalized)
Ripple Currents at different frequencies
Frequency Correction Factors for different frequencies
5. JIANGHAI Electrolytic Capacitor Lifetime Estimation Formula
L = L₀ · K_T · K_R · K_V
=
L₀· 2
T₀-T_A
10K
· K_i
[1- (
I_A
I_R
) ² _]·
∆ T₀
10K
·
(
U_A
U_R
)
-n
T₀ = 105°C
T₀ = 85°C
I_A > I_R → K_i = 4
I_A ≤ I_R → K_i = 2
→ K_i = 2
0,5 ≤ ^UA ≤ 1 → n = 2,5
U_R
0 < ^UA
U_R
< 0,5 → n = 0
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