TAP/TEP Technical Summary and
Application Guidelines
1.4.4 Temperature dependence of the impedance and ESR
Temperature Dependence of the
Impedance and ESR
At 100 kHz, impedance and ESR behave identically and
decrease with increasing temperature as the typical curves
show. For maximum limits at high and low temperatures,
please refer to graph opposite.
100
1/35
10
10/35
47/35
1
0.1
+40 +60
Temperature T (C)
0
+20
+80 +100 +125
-55 -40 -20
1.5 DC LEAKAGE CURRENT (DCL)
1.5.1 Leakage current (DCL)
Temperature Dependence of the
Leakage Current for a Typical Component
The leakage current is dependent on the voltage applied, the
time, and the capacitor temperature. It is measured
at +25°C with the rated voltage applied. A protective resist-
ance of 1000⍀ is connected in series with the capacitor
in the measuring circuit.
10
Three minutes after application of the rated voltage the leak-
age current must not exceed the maximum values indicated
in the ratings table. Reforming is unnecessary even after pro-
longed periods without the application of voltage.
1.5.2 Temperature dependence of the leakage current
1
The leakage current increases with higher temperatures, typical
values are shown in the graph.
For operation between 85°C and 125°C, the maximum
working voltage must be derated and can be found from the
following formula.
0.1
R
V max = 1- (T-85) x V volts
-55
-40 -20
0
20 40 60
80 100 125
ꢀ
120 ꢁ
Temperature °C
where T is the required operating temperature. Maximum
limits are given in rating tables.
Effect of Voltage Derating on Leakage Current
1.5.3 Voltage dependence of the leakage current
1
The leakage current drops rapidly below the value corre-
sponding to the rated voltage VR when reduced voltages are
applied. The effect of voltage derating on the leakage
current is shown in the graph.
This will also give a significant increase in reliability for any
application. See Section 3 (pages 155-157) for details.
TYPICAL RANGE
0.1
1.5.4 Ripple current
The maximum ripple current allowance can be calculated from
the power dissipation limits for a given temperature rise above
ambient. Please refer to Section 2 (page 154) for details.
0.01
0
20
% of Rated Voltage (VR)
40
60
80 100
MAY 2013 ■ 153
KYOCERA AVX [ KYOCERA AVX ]
