Performance Curves
Brick Dual
48Vin 3.3/1.8Vout 40W
12
11
10
9
8
7
6
5
4
3
2
1
0
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)
Quarter
I
out
(A)
25
40
55
70
85
Semiconductor junction temperature is
within 1°C of surface temperature
Ambient Air Temperature (
o
C)
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 1.8V output.
6
5
4
Figure 14:
Thermal plot of converter at 12 amp load on 3.3V ouput and
no load on 1.8V output with 55
°
C air flowing at 200 LFM. Air flow
across the converter is from pin 1 to pin 3 (nominal input voltage)
I
out
(A)
3
2
1
0
0
25
40
55
70
85
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
Ambient Air Temperature (
o
C)
Figure 15:
Max output power-derating curves vs. air temp for 0 to 400 LFM,
pin 1 to pin 3. 50% load (11A) on 1.8V output and 50% load (6A) on 3.3V output.
At derating points, 3.3V output decreases while 1.8V output remains unchanged.
9
8
7
6
Figure 16:
Thermal plot of converter at 5.8 amp load on 3.3V ouput
and 11 amp load on 1.8V output with 55
°
C air flowing at 200 LFM. Air
flow across the converter is from pin 1 to pin 3 (nominal input voltage)
I
out
(A)
5
4
3
2
1
0
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)
25
40
55
70
85
Ambient Air Temperature (
o
C)
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 17:
Max output power derating curves vs. air temp for 0 to 400 LFM, pin
1 to pin 3. 70% load (8.5A) on 3.3V output and 30% load (6.7A) on 1.8V output.
At derating points, 3.3V output decreases while 1.8V output remains unchanged.
Product # DQ63318QMA04
Phone 1-888-567-9596
Figure 18:
Thermal plot of converter at 8.5 amp load on 3.3V ouput and
6.7 amp load on 1.8V output with 55
°
C air flowing at 200 LFM. Air
flow across the converter is from pin 1 to pin 3 (nominal input voltage).
Doc.# 005-2DQ638H Rev. A
1/10/03
Page 7
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