NQB-420NWA-AN Datasheet, PDF (12/30 Pages) CUI INC – FULLY REGULATED ADVANCED BUS CONVERTERS

CUI Inc │ SERIES: NQB-N │ DESCRIPTION: FULLY REGULATED ADVANCED BUS CONVERTERS
date 02/20/2013 │ page 12 of 30
Typical Characteristics
12.0 V, 39 A / 468 W
Output Current Derating – Open frame
[A]
40
35
30
25
20
15
10
5
0
0
20
40
60
80
100 [°C]
Available load current vs. ambient air temperature and airflow at
V_I = 53 V. See Thermal Consideration section.
Output Current Derating – Base plate
3.0 m/s
2.0 m/s
1.5 m/s
1.0 m/s
0.5 m/s
Na t. Con v.
Thermal Resistance – Base plate
[A]
40
35
30
25
20
15
10
5
0
0
3.0 m/s
2.0 m/s
1.5 m/s
1.0 m/s
0.5 m/s
Na t. Con v.
20
40
60
80
100 [°C]
[°C/W]
6
5
4
3
2
1
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0[m/s]
Available load current vs. ambient air temperature and airflow at
V_I = 53 V. See Thermal Consideration section.
Output Current Derating – Base Plate + Heat sink
[A]
40
35
30
25
20
15
10
5
0
0
3.0 m/s
2.0 m/s
1.5 m/s
1.0 m/s
0.5 m/s
Na t. Con v.
20
40
60
80
100 [°C]
Thermal resistance vs. airspeed measured at the converter. Tested
in wind tunnel with airflow and test conditions as per the Thermal
consideration section. V_I = 53 V.
Output Current Derating – Cold wall sealed box
A
40
35
30
25
20
15
10
5
0
0
20
40
60
80
100 [°C]
Ta mb
85 °C
Available load current vs. ambient air temperature and airflow at
V_I = 53 V. See Thermal Consideration section. Tested with Plate Fin
Transverse heatsink, height 0.23 In, P0114 Thermal Pad.
Available load current vs. base plate temperature at 85ºC ambient.
V_I = 53 V. See Thermal Consideration section.
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