TABLE II. Ripple current multipliers versus frequency, temperature, and applied peak voltage. 1/ 2/ 3/ 4/ 5/
Frequency of
applied ripple
120 Hz
800 Hz
1 kHz
10 kHz
40 kHz
100 kHz
current
Temp °C
Temp °C
Temp °C
Temp °C
Temp °C
Temp °C
Ambient
≤55° 85° 105° 125° ≤55°
85° 105° 125° ≤55° 85° 105° 125° ≤55° 85° 105° 125° ≤55°
85° 105° 125° ≤55° 85° 105° 125°
still air
100 percent
.60
.39
---
---
.71
.43
---
---
.72
.45
---
---
.88
.55
---
---
1.0
.63
---
---
1.1
.69
---
---
90 percent
.60
.46
---
---
.71
.55
---
---
.72
.55
---
---
.88
.67
---
---
1.0
.77
---
---
1.1
.85
---
---
6/ 80 percent
.60
.52
.35
---
.71
.62
.42
---
.72
.62
.42
---
.88
.76
.52
---
1.0
.87
.59
---
1.1
.96
.65
---
1.1 1.07
70 percent
.60
.58
.44
---
.71
.69
.52
---
.72
.70
.52
---
.88
.85
.64
---
1.0
.97
.73
---
.80
---
≤ 66 2/3
1.1
.60
.60
.46
.27
.71
.71
.55
.32
.72
.72
.55
.32
.88
.88
.68
.40
1.0
1.0
.77
.45
1.1
.85
.50
percent
1/ At +125°C, the rated voltage of the capacitors decreases to 66.67 percent of the +85°C rated voltage.
2/ The peak of the applied ac ripple voltage plus the applied dc voltage must not exceed the dc voltage rating of the capacitor either forward or reverse.
3/ The ripple current listed in table I represents a rating calculated by using a maximum internal temperature rise (ĆT) at +50°C at 40 kHz at +85°C ambient
temperature,
with a maximum peak rated voltage of 66.67 percent of the +85°C peak voltage rating.
4/ The maximum allowable internal temperature rise (ĆT) decreases linearly to a calculated 10°C rise at +125°C ambient.
5/ The internal temperature rise is directly proportional to the ESR of the capacitor, and ESR increases with decreasing frequency.
6/ Percentage of +85°C rated peak voltage.
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