Performance Curves
Eighth
Brick
88
87
Efficiency (%)
95
90
85
48Vin 1.5Vout 15A
Efficiency (%)
86
85
84
83
82
25 C
40 C
55 C
80
75
70
65
60
0
2
3
5
6
8
9
11
12
14
15
35 Vin
48 Vin
75 Vin
0
100
200
300
400
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).
4.0
5
Power Dissipation (W)
4
Power Dissipation (W)
3.0
3
2.0
2
35 Vin
48 Vin
75 Vin
0
0
2
3
5
6
8
9
11
12
14
15
1
1.0
25 C
40 C
55 C
0.0
0
100
200
300
400
500
Air Flow (LFM)
Load Current (A)
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).
16
14
12
10
I
out
(A)
8
6
4
2
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)
50 LFM (0.25 m/s)
25
40
55
70
85
Ambient Air Temperature (
o
C)
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 5:
Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 50 LFM through 400 LFM with air flowing
across the converter from pin 3 to pin 1 (nominal input voltage).
Product # PQ60015EML15
Phone 1-888-567-9596
Figure 6:
Thermal plot of converter at 15 amp load current with 55
°
C
air flowing at the rate of 200 LFM. Air is flowing across the converter
sideways from pin 3 to pin 1 (nominal input voltage).
Doc.# 005-2EM651E Rev. B
9/3/03
Page 5
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