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
30
25
20
15
10
5
3.0 m/s
(600LFM)
3.0 m/s
(600LFM)
NC
15
1.0 m/s
(200LFM)
NC
1.0 m/s
(200LFM)
1.5 m/s
(300LFM)
10
1.5 m/s
(300LFM)
(400LFM)
2.0 m/s
(400LFM)
2.0 m/s
5
0
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, TA (°C)
LOCAL AMBIENT TEMPERATURE, TA (°C)
Figure 15. Output Current Derating for the Open
Frame QSW025A0B in the Transverse Orientation;
Airflow Direction from Vin(+) to Vin(-); Vin = 48V.
Figure 18. Output Current Derating for the
QSW025A0B-H in the Transverse Orientation with
baseplate and 0.5-inch high heatsink; Airflow
Direction from Vin(+) to Vin(–); Vin = 48V.
30
30
3.0 m/s
(600LFM)
3.0 m/s
(600LFM)
25
25
20
15
10
5
20
15
NC
NC
1.0 m/s
1.0 m/s
(200LFM) 1.5 m/s
(300LFM)
(200LFM)
1.5 m/s
(300LFM)
10
5
2.0 m/s
(400LFM)
2.0 m/s
(400LFM)
0
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, TA (°C)
LOCAL AMBIENT TEMPERATURE, TA (°C)
Figure 16. Output Current Derating for the
QSW025A0B-H in the Transverse Orientation with
baseplate; Airflow Direction from Vin(+) to Vin(–);
Vin = 48V.
Figure 19. Output Current Derating for the
QSW025A0B-H in the Transverse Orientation with
baseplate and 1.0-inch high heatsink; Airflow
Direction from Vin(+) to Vin(–); Vin = 48V.
30
3.0 m/s
(600LFM)
25
20
15
10
5
NC
1.0 m/s
(200LFM)
1.5 m/s
(300LFM)
2.0 m/s
(400LFM)
0
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, TA (°C)
Figure 17. Output Current Derating for the
QSW025A0B-H in the Transverse Orientation with
baseplate and 0.25-inch high heatsink; Airflow
Direction from Vin(+) to Vin(–); Vin = 48V.
10
LINEAGE POWER
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
