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T Series Data Sheet
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Environmental Conditions
Table 16: Mechanical and climatic stress
500 Watt AC-DC Converters
Test method
Standard
Test conditions
Status
Cab
Damp heat
steady state
IEC/EN 60068-2-78
Temperature:
Relative humidity:
40 ±2 °C
93 +2/-3 %
Unit not
operating
Duration:
56 days
Ea
Shock
(half-sinusoidal)
IEC/EN 60068-2-27
Acceleration amplitude:
Bump duration:
100 g n = 981 m/s 2
6 ms
Unit
operating
Number of bumps:
18 (3 each direction)
Eb
Bump
(half-sinusoidal)
IEC/EN 60068-2-29
Acceleration amplitude:
Bump duration:
40 g n = 392 m/s 2
6 ms
Unit
operating
Number of bumps:
6000 (1000 in each direction)
Fc
Vibration
IEC/EN 60068-2-6
Acceleration amplitude:
0.21 mm (10 – 60 Hz)
Unit
(sinusoidal)
Frequency (1 Oct/min):
Test duration:
3 g n = 29.4 m/s 2 (60 – 2000 Hz)
10 – 2000 Hz
7.5 h (2.5 h each axis)
operating
Fda
Random vibration
wide band
IEC/EN 60068-2-35
DIN 40046 part 23
Acceleration spectral density:
Frequency band:
0.05 g n rms
20 – 500 Hz
Unit
operating
Reproducibility
high
Acceleration magnitude:
Test duration:
4.9 g n rms
3 h (1 h each axis)
Kb
Salt mist, cyclic
(sodium chloride
IEC/EN 60068-2-52
Concentration:
Duration:
5% (30 °C)
2 h per cycle
Unit not
operating
NaCl solution)
Table 17 Temperature specifications
Storage:
Storage duration:
Number of cycles:
–7
Unit
40 °C, 93% rel. humidity
22 h per cycle
3
Characteristic
Conditions
min
typ
max
T A
Ambient operational
temperature range
I o = 0 – I o nom
I o > I o nom
–25
–25
71
65
°C
T C
Case temperature range I o = 0 – I o nom
–25
95
at measurement point;
see Mechanical Data
I o > I o nom
–25
90
T S
Storage temperature
–40
100
range (not operating)
T Cs
Case temperature,
when shut down
100
R th CA Thermal resistance
case to ambient
convection
cooling
0.5
K/W
t C
Thermal time constant
1
h
of case
Table 18: Reliability
Values at specified
case temperature
Model
Ground benign
40°C
Ground fixed
40°C 70°C
Ground mobile
50°C
Unit
MTBF 1
LT1701-7
198 000
56 000
26 000
20 000
h
Device hours 2
810 000
1
2
Calculated in accordance with MIL-HDBK-217E (calculation accord. to edition F would show even better results)
Statistical values, based on an average of 4300 working hours per year and in general field use, over 3 years
BCD20023 Rev AB, 02-Nov-2010
Page 22 of 31
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