Datasheet

cui.com
date 11/07/2014 │ page 19 of 36CUI Inc │ SERIES: NQB-D │ DESCRIPTION: FULLY REGULATED ADVANCED BUS CONVERTERS
Typical Characteristics
12.45 V, 39 A / 462 W
Output Current Derating – Open frame
0
5
10
15
20
25
30
35
40
020406080 100 [°C]
[A]
3.0 m/s
2.0 m/s
1.5 m/s
1.0 m/s
0.5 m/s
Na t. Conv.
Available load current vs. ambient air temperature and airflow at
V
I
= 53 V. See Thermal Consideration section.
Output Current Derating – Base plate Thermal Resistance – Base plate
0
5
10
15
20
25
30
35
40
020406080100 [° C]
[A]
3.0 m/s
2.0 m/s
1.5 m/s
1.0 m/s
0.5 m/s
Na t. Conv.
0
1
2
3
4
5
6
0.00.5 1.01.5 2.02.5 3.0[m/s]
[°C/W]
Available load current vs. ambient air temperature and airflow at
V
I
= 53 V. See Thermal Consideration section.
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 – Base Plate + Heat sink Output Current Derating – Cold wall sealed box
0
5
10
15
20
25
30
35
40
020406080100 [° C]
[A]
3.0 m/s
2.0 m/s
1.5 m/s
1.0 m/s
0.5 m/s
Na t. Conv.
0
5
10
15
20
25
30
35
40
020406080100 [°C]
A
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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