Data Sheet
February 16, 2009
QSW025A0B Series Power Modules; DC-DC Converters
36 – 75Vdc Input; 12Vdc Output; 25A Output Current
Feature Descriptions (continued)
30
25
20
15
10
5
30
25
20
3.0 m/s
(600LFM)
3.0 m/s
(600LFM)
NC
15
1.0 m/s
(200LFM)
NC
1.5 m/s
(300LFM)
1.0 m/s
(200LFM)
1.5 m/s
10
2.0 m/s
(400LFM)
5
0
(300LFM)
2.0 m/s
(400LFM)
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, TA (°C)
Figure 20. Output Current Derating for the Open
Frame QSW025A0B in the Longitudinal Orientation;
Airflow Direction from Vout to Vin; Vin = 48V.
LOCAL AMBIENT TEMPERATURE, TA (°C)
Figure 23. Output Current Derating for the
QSW025A0B-H in the Longitudinal Orientation with
baseplate and 0.5-inch high heatsink; Airflow
Direction from Vout to Vin; Vin = 48V.
30
30
3.0 m/s
(600LFM)
25
20
15
10
5
25
3.0 m/s
(600LFM)
20
NC
15
NC
1.0 m/s
(200LFM)
1.0 m/s
(200LFM)
1.5 m/s
1.5 m/s
(300LFM)
10
2.0 m/s
(400LFM)
(300LFM)
2.0 m/s
(400LFM)
5
0
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, TA (°C)
Figure 21. Output Current Derating for the
QSW025A0B-H in the Longitudinal Orientation with
baseplate; Airflow Direction from Vout to Vin; Vin =
48V.
LOCAL AMBIENT TEMPERATURE, TA (°C)
Figure 24. Output Current Derating for the
QSW025A0B-H in the Longitudinal Orientation with
baseplate and 1.0-inch high heatsink; Airflow
Direction from Vout to Vin; Vin = 48V.
30
3.0 m/s
(600LFM)
25
20
NC
15
1.0 m/s
(200LFM)
1.5 m/s
(300LFM) 2.0 m/s
10
(400LFM)
5
0
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, TA (°C)
Figure 22. Output Current Derating for the
QSW025A0B-H in the Longitudinal Orientation with
baseplate and 0.25-inch high heatsink; Airflow
Direction from Vout to Vin; Vin = 48V.
LINEAGE POWER
11
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
