198 phr-si, Vishay bccomponents, Ripple current and useful life – C&H Technology 198 PHR-SI User Manual
Page 6: Additional electrical data, Multiplier of ripple current (i, As a function of frequency, Maximum ripple current multiplier
Document Number: 28339
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Revision: 08-Aug-08
53
198 PHR-SI
Aluminum Capacitors
Power High Ripple Current Snap-In
Vishay BCcomponents
Table 3
RIPPLE CURRENT AND USEFUL LIFE
Note
Calculation example for case Ø D x L = 35 x 25 mm
Therefore the maximum ripple current multiplier at 70 °C, 300 Hz and 2 m/s air-flow = 1.57 x 1.17 x 1.35 = 2.48.
ADDITIONAL ELECTRICAL DATA
PARAMETER
CONDITIONS
VALUE
Voltage
Surge voltage
≥ 400 V versions
U
s
= 1.1 x U
R
Reverse voltage
≤ 1 V
Current
Leakage current
After 1 minute at U
R
I
L1
≤ 0.006 C
R
x U
R
+ 4 µA
After 5 minutes at U
R
I
L5
≤ 0.002 C
R
x U
R
+ 4 µA
Inductance
Equivalent series inductance (ESL)
All case sizes
typ. 19 nH
max. 25 nH
MULTIPLIER OF RIPPLE CURRENT (I
R
) AS A FUNCTION OF FREQUENCY
FREQUENCY (Hz)
I
R
MULTIPLIER
50
0.86
100
1.00
300
1.17
600
1.24
1000
1.29
≥ 10 000
1.40
MAXIMUM RIPPLE CURRENT MULTIPLIER
PARAMETER
CONDITION
MAXIMUM RIPPLE CURRENT MULTIPLIER
VALUE
Ambient temperature (T
amb
)
70
°C
from nomogram; see Fig.7
1.57
Operating frequency (f)
300 Hz
from frequency table; see Table
1.17
Air-flow
2 m/s
from air-flow; see Fig.6
1.35
1.0
1.1
1.2
1.3
1.4
1.5
1.6
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
(1)
(2)
(3)
(4)
air velocity (m/s)
I
R
forced
I
R
free
Fig. 6 Multiplier of ripple current (I
R
) as a function of air-flow
Curve 1: case
Ø D x L = 35 x 25 mm
Curve 2: case
Ø D x L = 22 x 25 mm
Curve 3: case
Ø D x L = 35 x 50 mm
Curve 4: case
Ø D x L = 22 x 40 mm