Performance Curves
Brick Dual
Quarter
48V 3.3/2.5V
40W
out
in
12
11
10
9
8
7
6
5
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
4
3
2
1
0
Semiconductor junction temperature is
within 1 C of surface temperature
0
25
40
55
70
85
°
Ambient Air Temperature (oC)
Vin = 48V
Figure 13: Maximum output power-derating curves vs. ambient air tem-
perature for airflow rates of 0 to 400 LFM, air flowing from pin 1 to pin
3. Full load (12A) on 3.3V output and no load on 2.5V output.
Figure 14: Thermal plot of converter at 12 amp load on 3.3V ouput and
no load on 2.5V output with 55°C air flowing at 200 LFM. Air flow
across the converter is from pin 1 to pin 3 (nominal input voltage)
6
5
4
3
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
2
1
0
Semiconductor junction temperature is
within 1°C of surface temperature
0
25
40
55
70
85
Ambient Air Temperature (oC)
Vin = 48V
Figure 15: Max output power-derating curves vs. air temp for 0 to 400 LFM,
pin 1 to pin 3. 50% load (8A) on 2.5V output and 50% load (6A) on 3.3V output.
At derating points, 3.3V output decreases while 2.5V output remains unchanged.
Figure 16: Thermal plot of converter at 8 amp load on 2.5V ouput and
6 amp load on 3.3V output with 55°C air flowing at 200 LFM. Air flow
across the converter is from pin 1 to pin 3 (nominal input voltage)
9
8
7
6
5
4
3
2
1
0
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
Semiconductor junction temperature is
within 1°C of surface temperature
0
25
40
55
70
85
Ambient Air Temperature (oC)
Vin = 48V
Figure 17: Max output power derating curves vs. air temp for 0 to 400 LFM, pin
1 to pin 3. 30% load (4.8A) on 2.5V output and 70% load (8.5A) on 3.3V output.
At derating points, 3.3V output decreases while 2.5V output remains unchanged.
Figure 18: Thermal plot of converter at 4.8 amp load on 2.5V ouput and
8.5 amp load on 3.3V output with 55 C air flowing at 200 LFM. Air
flow across the converter is from pin 1 to pin 3 (nominal input voltage).
°
Product # DQ63325QMA04
Phone 1-888-567-9596
Doc.# 005-2DQ632H Rev. C 7/7/04 Page 7
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