Performance Curves
Brick
100
95
90
Half
90
89
88
48Vin 2.5Vout 60A
Efficiency (%)
Efficiency (%)
36 Vin
48 Vin
75 Vin
85
80
75
70
65
60
0
6
12
18
24
30
36
42
48
54
60
87
86
85
84
83
82
0
100
200
300
400
25 C
40 C
55 C
500
Load Current (A)
Air Flow (LFM)
Figure 1:
Efficiency at nominal output voltage vs. load current for min-
imum, nominal, and maximum input voltage at 25
°
C.
Figure 2:
Efficiency 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).
12.0
11.0
Power Dissipation (W)
24
22
20
Power Dissipation (W)
18
16
14
12
10
8
6
4
2
0
0
6
12
18
24
30
36
42
48
10.0
9.0
8.0
7.0
6.0
5.0
4.0
25 C
40 C
55 C
36 Vin
48 Vin
75 Vin
54
60
0
100
200
300
400
500
Load Current (A)
Air Flow (LFM)
Figure 3:
Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25
°
C.
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).
60
50
40
Iout (A)
30
20
10
0
0
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)
25
40
55
70
85
Ambient Air Temperature (
o
C)
Figure 5:
Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
from output to input (nominal input voltage).
Product # PQ48025HTA60
Phone 1-888-567-9596
Figure 6:
Thermal plot of converter at 50 amp load current with 55
°
C
air flowing at the rate of 200 LFM. Air is flowing across the converter
from output to input (nominal input voltage).
Doc.# 005-2HT425F Rev. Q
11/19/02
Page 5
Semiconductor junction temperature is
within 1°C of surface temperature
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