Datasheet

www.recom-power.com
REV.: 0/2019 PD-6
DC/DC Converter
Specifications (measured @ Ta= 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
Parameter
Condition
Value
Rolling Stock equipment - Shock and Vibration tests
Random vibration
5Hz to 150Hz
Transverse: 0.45m/s²
Longitudinal: 0.7m/s²
Vertical: 1.01m/s²
Duration: 10min/axis
EN61373:2010
Increased random
vibration
5Hz to 150Hz
Transverse: 2.55m/s²
Longitudinal: 3.86m/s²
Vertical: 5.72m/s²
Duration: 5h/axis
Shock
Transverse: 30m/s² (Peak)
Longitudinal: 506m/s² (Peak)
Vertical: 30m/s² (Peak)
Environmental testing Part 2-1 Test A: Cold -40°C, 2 hours EN60068-2-1:2007
Environmental testing Part 2-2 Test B: Dry heat +70°C and +85°C, 6 hours EN60068-2-2:2007
Environmental testing Part 2-30 Heat damp test
Temperature: +25 to +55°C
Humidity: 95% ±5% RH
Test Duration: 48 hours
EN60068-2-30:2005
Fire protection on railway vehicles Part2: Requirements for fire behav-
iour of materials and components
EN45545-2:2013
Fire hazard testing Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end-products
Oxygen index test EN ISO 4589-2 OI
Fire hazard testing Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
Glow-wire test EN60695-2-11
MTBF according to MIL-HDBK-217F, G.B. +25°C 2090 x 10
3
hours
RP12-AR
Series
T
case max
= 105°C
P
out set
= 100%
R
th
= 12.5K/W (vertical)
Thermal Calculation:
T
amb
=
T
case max.
- T
over
T
amb
=
105 - 16.7 =
+88.3°C
T
over
=
R
th
x P
diss
T
over
=
12.5 x 1.33 =
+16.7°C
P
diss
=
P
out set
x
1 -
η
η
Practical Example:
Take the RP12-11024SAR with 110V Input Voltage, 100% load, natural convection 0.1m/s, in vertical direction.
(6)
What is the maximum ambient operating temperature?
T
case max.
= max. case temperature [°C]
T
over
= temperature losses [°C]
T
amb
= ambient temperature [°C]
P
out nom.
= nom. output power [W]
Derating Graph
(@ Chamber with 0.1m/s natural convection)
Thermal Impedance
airflow
[m/s]
Rth w/o PCB
[K/W]
Rth w PCB
[K/W]
0.1 17.8 12.5
2 6.3 4.4
P
diss
=
12W x
1 - 0.9
= 1.33W
0.9
-40 -20 0 20 40 7060-30 -10 10 30 50 80
88
90 110100
100
80
60
40
90
70
50
30
20
10
0
Output Load [%]
Ambient Temperature [°C]
110Vin with PCB
(6)
48Vin with PCB
(6)
110Vin w/o PCB
48Vin w/o PCB
Notes:
Note6: Test PCB: Eurocard 160x100mm 105µm copper, double layer
P
out set
= output power set [W]
η = efficiency (see graph) [%]
P
diss
= internal losses [W]
R
th
= thermal impedance [K/W]