Performance Curves
Brick Dual
48Vin 3.3/1.8Vout 40W
90
85
Quarter
9
8
Power Dissipation (W)
7
6
5
4
3
2
1
0
35 Vin
48 Vin
75 Vin
0
4
8
12
16
20
24
28
32
36
40
Efficiency (%)
80
75
70
65
60
0
4
8
12
16
20
24
28
32
36
40
35 Vin
48 Vin
75 Vin
Total Output Power (W)
Total Output Power (W)
Figure 1:
Efficiency vs. output power, from 0 load to full load with 50%
load on 1.8V output and 50% load on 3.3V output at minimum, nominal,
and maximum input voltage at 25
°
C.
100
95
Figure 2:
Power dissipation vs. output power, from 0 load to full load
with 50% load on 1.8V output and 50% load on 3.3V output at mini-
mum, nominal, and maximum input voltage at 25
°
C.
8
7
Power Dissipation (W)
90
6
5
4
3
2
1
0
Efficiency (%)
85
80
75
70
65
60
13.3/0
35 Vin
48 Vin
75 Vin
11/1.3
9/2.4
7/3.5
5/4.5
3/5.6
1/6.7
0/7.3
35 Vin
48 Vin
75 Vin
13.3/0
11/1.3
9/2.4
7/3.5
5/4.5
3/5.6
1/6.7
0/7.3
Load Current (A), 1.8Vout/3.3Vout
Load Current (A), 1.8Vout/3.3Vout
Figure 3:
Efficiency vs. load current, with total output power fixed at
60% load (24W) and load currents split as shown between 1.8V and
3.3V outputs at minimum, nominal, and maximum input voltage at 25
°
C.
88
87
Figure 4:
Power dissipation vs. load current, with total output power
fixed at 60% load (24W) and load currents split as shown between 1.8V
and 3.3V outputs at minimum, nominal, and max input voltage at 25
°
C.
8.0
7.0
Power Dissipation (W)
86
85
Efficiency
(%)
6.0
5.0
4.0
3.0
2.0
0
100
200
300
400
Air Flow (LFM)
25 C
40 C
55 C
84
83
82
81
80
79
78
0
100
200
300
400
25 C
40 C
55 C
500
500
Air Flow
(LFM)
Figure 5:
Efficiency at 80% load and 50/50 voltage split (8.9A load on
1.8V and 4.8A load on 3.3V) versus airflow rate for ambient air temper-
atures of 25
°
C, 40
°
C.and 55
°
C.(nominal input voltage).
Product # DQ63318QMA04
Phone 1-888-567-9596
Figure 6:
Power dissipation at 80% load and 50/50 voltage split (8.9A
load on 1.8V and 4.8A load on 3.3V) versus airflow rate for ambient air
temperatures of 25
°
C, 40
°
C.and 55
°
C.(nominal input voltage).
Doc.# 005-2DQ638H Rev. A
1/10/03
Page 5
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