C&H Technology 157 PUM-SI - Manual (Page 8)

Document Number: 28338 For technical questions, contact: [email protected] www.vishay.com
Revision: 18-Aug-08 47
157 PUM-SI
Aluminum Capacitors
Power Ultra Miniature Snap-In
Vishay BCcomponents
RIPPLE CURRENT AND USEFUL LIFE
Table 3
MULTIPLIER OF RIPPLE CURRENT (I
R
) AS A FUNCTION OF FREQUENCY
FREQUENCY
(Hz)
I
R
MULTIPLIER
50 0.90
100 0.95
120 1.00
200 1.15
1000 1.30
≥ 10 000 1.40
Fig.6 Multiplier of useful life as a function of ambient temperature and ripple current load
I
A
= actual ripple current at 120 Hz
I
R
= rated ripple current at 120 Hz and 85 °C
(1) Useful life at 85 °C and I
R
applied: 5000 hours
1.3
1.2
1.1
1.0
0.8
0.5
0.0
40 50 60 70 80 90
I A
R
I
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
(1 )
45
60
30
20
10
8
5
4
3
2
2.5
1.5
1
1.2
15
MGA453
life multiplier
T
amb
(°C)