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

Reverse voltage

≤ 1V

Current

Leakage current

Inductance

Equivalent series inductance (ESL)

All case sizes

typ. 19 nH

max. 25 nH

FREQUENCY (Hz)

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

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)

Curve 1: case

Ø D x L=35 x25mm

Curve 2: case

Ø D x L=22 x25mm

Curve 3: case

Ø D x L=35 x50mm

Curve 4: case

Ø D x L = 22 x 40 mm