Performance Curves
Brick Dual
48Vin 3.3/1.8Vout 40W
1.9
1.88
1.86
1.84
V
OUT1
(V)
1.82
1.8
1.78
1.76
1.74
1.72
1.7
.7
.3
/0
/4
/2
/5
/1
22
15
.5
20
.5
17
12
Quarter
1.9
1.88
1.86
1.84
3.4
3.4
Input voltage effects cross regu-
lation by maximum of 9mV
3.38
3.36
3.34
Input voltage effects cross regu-
lation by maximum of 2mV
3.38
3.36
3.34
V
OUT2
(V)
3.3
3.28
3.26
3.24
1.8V_48Vin
3.3V_48Vin
.3
.6
.6
8
3
5/
9.
10
/6
7.
5/
0/
12
1.8
1.78
1.76
1.74
1.72
1.7
13.3/0
11/1.3
9/2.4
3.3
3.28
3.26
3.24
1.8V_48Vin
3.3V_48Vin
7/3.5
5/4.5
3/5.6
1/6.7
3.22
3.2
5/
3.22
3.2
0/7.3
10
2.
I
OUT1
/ I
OUT2
(A)
I
OUT1
/ I
OUT2
(A)
Figure 7:
Load regulation vs. load current with power fixed at full load
(40W) and load currents split as shown between 1.8V and 3.3V outputs,
at nominal input voltage.
1.9
1.88
1.86
1.84
V
OUT1
(V)
1.82
1.8
1.78
1.76
1.74
1.72
1.7
5.0
10.0
15.0
Figure 8:
Load regulation vs. load current with power fixed at 60%
load (24W) and load currents split as shown between 1.8V and 3.3V
outputs, at nominal input voltage.
1.9
1.88
1.86
1.84
3.4
3.4
Input voltage effects cross regu-
lation by maximum of 2mV
3.38
3.36
3.34
Input voltage effects cross regu-
lation by maximum of 2mV
3.38
3.36
3.34
V
OUT2
(V)
3.3
3.28
3.26
3.24
1.8V_48Vin
3.3V_48Vin
3.22
3.2
30.0
35.0
40.0
1.8
1.78
1.76
1.74
1.72
1.7
4.4
9
13.3
17.7
22
26.5
31
35
40
3.3
3.28
3.26
1.8V_48Vin
3.3V_48Vin
3.24
3.22
3.2
Total Output Power (W)
20.0
25.0
Total Output Power (W)
Figure 9:
Load regulation vs. output power from 5W load to full load
with 75% load on 1.8V output and 25% load on 3.3V output at nominal
input voltage.
22
20
18
16
14
Figure 10:
. Load regulation vs. output power from 4.4W load to full
load with 25% load on 1.8V output and 75% load on 3.3V output at
nominal input voltage.
I
out
(A)
12
10
8
6
4
2
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 11
:
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 (22A) on 1.8V output and no load on 3.3V output.
Product # DQ63318QMA04
Phone 1-888-567-9596
Figure 12
:
Thermal plot of converter at 22 amp load on 1.8V ouput and
no 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)
Doc.# 005-2DQ638H Rev. A
1/10/03
Page 6
V
OUT2
(V)
V
OUT1
(V)
3.32
1.82
3.32
V
OUT2
(V)
3.32
V
OUT1
(V)
1.82
3.32
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