FFLC31MA4427 Datasheet, PDF (3/9 Pages) AVX Corporation – Medium Power Film Capacitors

Medium Power Film Capacitors
FFLC
3. Refer to the curve and deduce the lifetime vs U_w/U_n ratio
1.4
1.3
eg: rated voltage 1000V
1.2
working voltage 950V
ρ = 0.95 ⇒ lifetime 200,000 hours
.1.1
@ 70°C hot spot temperature
1
HS^=70°C
Please, find a calculation form at the end of the catalog
0.95
0.9
0.8
100
1,000
10,000
Lifetime Expectancy (hours)
THERMAL RESISTANCES
Rth1 (°C/W): Thermal resistance
between hot spot and case
Height
(mm)
245
315
385
455
525
595
Rth1 (°C/W)
Width (mm)
100
125
150
0.56
0.67
0.76
0.41
0.49
0.56
0.3
0.36
0.41
0.25
0.3
0.34
0.2
0.24
0.27
0.17
0.21
0.24
175
0.82
0.6
0.44
0.37
0.3
0.26
100,000 200,000
1,000,000
Rth2 (°C/W): Thermal resistance between case and ambient air
under natural convection and forced air
Height
(mm)
245
315
385
455
525
595
100
0.47
0.36
0.30
0.25
0.22
0.19
Rth2 (°C)
Natural air cooling
Width (mm)
125
150
175
0.44
0.42
0.40
0.35
0.33
0.31
0.28
0.27
0.25
0.24
0.23
0.22
0.21
0.20
0.19
0.18
0.17
0.16
Forced air cooling >2m/s
Width (mm)
100
125
150
175
0.23 0.22
0.21
0.20
0.18 0.17
0.16
0.16
0.15 0.14
0.13
0.13
0.13 0.12
0.11
0.11
0.11 0.10
0.10
0.09
0.10 0.09
0.09
0.08
For confined area, capacitor working in a closed cabinet, a thermal test
under real conditions is necessary to evaluate the thermal resistance.
PARASITIC INDUCTANCE VS SIZE
Measurement @ 1MHz
Ls (nH)
Height
Width (mm)
(mm) 100
125
150
175
245
32
34
35
37
315
34
36
38
40
385
36
39
41
44
455
38
41
44
48
525
40
43
47
51
595
42
46
51
55
Low inductance design
available on request
44 ■ JUNE 2015