Rugged Environment
AC-DC Converters >100 Watt
K Series
Edition 4/4.99
17/28
MELCHER
The Power Partners.
Table 11: MTBF
Values at Specied
Type
Ground Benign
Ground Fixed
Ground Mobile
Unit
Case Temperature
40
°C40°C70°C50°C
MTBF1
LK 4301–7ER
514'000
88'000
38'000
35'000
h
1 Calculated in accordance with MIL-HDBK 217F.
Table 10: Temperature specications, values given are for an air pressure of 800...1200 hPa (800...1200 mbar)
Temperature
-6 (LK 4003)
Standard -7
Option -9
Characteristics
Conditions
min
max
min
max
min
max
Unit
TA
Ambient temperature
U i min...U i max
–25
60
–25
71
–40
71
°C
TC
Case temperature
I o = 0...I o nom
–25
90
–25
95
–40
95
TS
Storage temperature
Not operational
–40
100
–40
100
–55
100
Immunity to Environmental Conditions
Table 9: Mechanical stress
Test method
Standard
Test conditions
Status
Ca
Damp heat
IEC/DIN IEC 60068-2-3
Temperature:
40 ±2
°C
Unit not
steady state
MIL-STD-810D section 507.2
Relative humidity:
93 +2/-3 %
operating
Duration:
56 days
Ea
Shock
IEC/EN/DIN EN 60068-2-27
Acceleration amplitude:
100 gn = 981 m/s2
Unit
(half-sinusoidal)
MIL-STD-810D section 516.3
Bump duration:
6 ms
operating
Number of bumps:
18 (3 each direction)
Eb
Bump
IEC/EN/DIN EN 60068-2-29
Acceleration amplitude:
40 gn = 392 m/s2
Unit
(half-sinusoidal)
MIL-STD-810D section 516.3
Bump duration:
6 ms
operating
Number of bumps:
6000 (1000 each direction)
Fc
Vibration
IEC/EN/DIN EN 60068-2-6
Acceleration amplitude:
0.35 mm (10...60 Hz)
Unit
(sinusoidal)
MIL-STD-810D section 514.3
5 gn = 49 m/s2 (60...2000 Hz)
operating
Frequency (1 Oct/min):
10...2000 Hz
Test duration:
7.5 h (2.5 h each axis)
Fda
Random vibration
IEC 60068-2-35
Acceleration spectral density: 0.05 gn2/Hz
Unit
wide band
DIN 40046 part 23
Frequency band:
20...500 Hz
operating
Reproducibility
Acceleration magnitude:
4.9 gn rms
high
Test duration:
3 h (1 h each axis)
Kb
Salt mist, cyclic
IEC/EN/DIN IEC 60068-2-52
Concentration:
5% (30
°C)
Unit not
(sodium chloride
Duration:
2 h per cycle
operating
NaCl solution)
Storage:
40
°C, 93% rel. humidity
Storage duration:
22 h per cycle
Number of cycles:
3
90
80
70
60
50
40
30
20
10
0
.01
0
.05
0.1
0.5
1
2
5
10
20
30
[dB
V]
MHz
0
.02
07063
A
B
Fig. 23
Typical disturbance voltage (quasi-peak) at the input accord-
ing to CISPR 11/22 and EN 55011/22, measured at
Ui nom and Io nom.
50
40
30
20
10
0
30
50
100
200
500
1000
[dB
V/m]
[MHz]
A
B
07038
Fig. 24
Typical radiated electromagnetic field strength (quasi-peak)
according to CISPR 11/22 and EN 55011/22, normalized to
a distance of 10 m, measured at Ui nom and Io nom.