Performance Curves
Brick Dual
Quarter
48V 3.3/1.8V
77W
out
in
90
89
88
87
86
85
84
83
10
9
8
7
6
3.3Vo, 35Vin
1.8Vo, 35Vin
3.3Vo, 48Vin
1.8Vo, 48Vin
3.3Vo, 75Vin
1.8Vo, 75Vin
3.3Vo, 35Vin
1.8Vo, 35Vin
3.3Vo, 48Vin
1.8Vo, 48Vin
3.3Vo, 75Vin
1.8Vo, 75Vin
5
4
7
8
9
10
11
12
13
14
15
7
8
9
10
11
12
13
14
15
Load Current (A)
Load Current (A)
Figure 1: Efficiency vs. output current, from half load to full load on
each output voltage at minimum, nominal, and maximum input voltage
at 25 C. Output not under test is held constant at half load.
Figure 2: Power dissipation vs. output current, from half load to full
load on each output voltage at minimum, nominal, and maximum input
°
voltage at 25
°C. Output not under test is held constant at half load.
100
95
90
85
80
75
70
65
60
12
11
10
9
8
7
6
5
4
3
35 Vin
48 Vin
75 Vin
35 Vin
48 Vin
75 Vin
2
1
0
0
0
10
20
30
40
50
60
70
10
20
30
40
50
60
70
Total Output Power (W)
Total Output Power (W)
Figure 3: Overall converter efficiency vs. output power from zero load
Figure 4: Overall converter power dissipation vs. output power from
to full load at minimum, nominal, and maximum input voltage at 25
Both loads are equal and range from zero to full load.
°
C.
zero load to full load at minimum, nominal, and maximum input voltage
at 25°C. Both loads are equal and range from zero to full load.
90.0
89.5
89.0
88.5
88.0
87.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
87.0
25 C
40 C
55 C
25 C
40 C
55 C
86.5
86.0
0
50
100
150
200
250
300
350
400
0
50
100
150
200
250
300
350
400
Airflow (LFM)
Airflow (LFM)
Figure 5: Overall converter efficiency at nominal output voltages and
Figure 6: Overall converter power dissipation at nominal output volt-
60% rated power on each output rail vs. airflow rate for ambient tem-
ages and 60% rated power on each output rail vs. airflow rate for
peratures of 25
°C, 40
°
C and 55
°
C (nominal input voltage).
ambient temperatures of 25°C, 40°C and 55°C (nominal input voltage).
Product # DQ63318QGL08
Phone 1-888-567-9596
Doc.# 005-2DQ638D Rev. B
10/7/03
Page 5
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