Performance Curves
Brick
Quarter
48V 15V
6.7A
out
in
95
90
85
80
75
70
65
60
90
89
88
87
86
85
84
83
36 Vin
48 Vin
75 Vin
25 C
40 C
55 C
82
0
0.0
0.7
1.3
2.0
2.7
3.3
4.0
4.7
5.3
6.0
6.7
100
200
Air Flow (LFM)
300
400
500
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for min-
Figure 2: Efficiency at nominal output voltage and 60% rated power vs.
imum, nominal, and maximum input voltage at 25
°C.
airflow rate for ambient air temperatures of 25
(nominal input voltage).
°C, 40°C, and 55°C
16
14
12
10
8
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
6
4
36 Vin
48 Vin
75 Vin
25 C
40 C
55 C
2
0
0
100
200
300
400
500
0.0
0.7
1.3
2.0
2.7
3.3
4.0
4.7
5.3
6.0
6.7
Air Flow (LFM)
Load Current (A)
Figure 3: Power dissipation at nominal output voltage vs. load current
Figure 4: Power dissipation at nominal output voltage and 60% rated
power vs. airflow rate for ambient air temperatures of 25 C, 40 C, and
55 C (nominal input voltage).
for minimum, nominal, and maximum input voltage at 25
°C.
°
°
°
7.0
6.0
5.0
4.0
3.0
400 LFM (2.0 m/s)
2.0
1.0
0.0
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
0
25
40
55
70
85
°
Ambient Air Temperature (oC)
Figure 5: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
across the converter from pin 1 to pin 3 (nominal input voltage).
Figure 6: Thermal plot of converter at 5.2 amp load current (78W) with
55 C air flowing at the rate of 200 LFM. Air is flowing across the con-
verter sideways from pin 1 to pin 3 (nominal input voltage).
°
Product # PQ48150QGA07
Phone 1-888-567-9596
Doc.# 005-2QG415D Rev. D 8/16/02
Page 5
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