Performance Curves
Brick Dual
Quarter
48V 3.3/1.8V
77W
out
in
15
14
13
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)
4
3
2
1
0
Semiconductor junction temperature is
within 1 C of surface temperature
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
°
3.3V, Iout (A)
Figure 7: Maximum output power derating curves at 55
°C vs. airflow
Figure 8: Thermal plot of converter at 15A load on 1.8V ouput and 15A
rates of 100 through 400 LFM. Curve shows available current for 1.8V
rail on y axis and available current for 3.3V rail on x axis. (nom. Vin)
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).
15
14
13
12
11
10
9
8
7
6
5
400 LFM (2.0 m/s)
4
300 LFM (1.5 m/s)
3
2
1
0
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
Semiconductor junction temperature is
within 1°C of surface temperature
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
3.3V, Iout (A)
Figure 9: Maximum output power derating curves at 70
°C vs. airflow
Figure 10: . Thermal plot of converter at 15A load on 1.8V ouput and
rates of 100 through 400 LFM. Curve shows available current for 1.8V
rail on y axis and available current for 3.3V rail on x axis. (nom. Vin)
12.5A load on 3.3V output with 70°C air flowing at 200 LFM. Air flow
across the converter is from pin 1 to pin 3 (nominal input voltage).
15
14
13
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)
4
3
2
1
0
Semiconductor junction temperature is
within 1°C of surface temperature
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
3.3V, Iout (A)
Figure 11: Maximum output power derating curves at 85
°C vs. airflow
Figure 12: Thermal plot of converter at 13A load on 1.8V ouput and
10A load on 3.3V output with 85 C air flowing at 200 LFM. Air flow
across the converter is from pin 1 to pin 3 (nominal input voltage).
rates of 100 through 400 LFM. Curve shows available current for 1.8V
rail on y axis and available current for 3.3V rail on x axis. (nom. Vin)
°
Product # DQ63318QGL08
Phone 1-888-567-9596
Doc.# 005-2DQ638D Rev. B 10/7/03
Page 6
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