Technical Specification
95
90
85
88
87
86
Input:
Output:
Current:
Package:
35-75 V
1.8 V
20 A
Eighth-brick
Efficiency (%)
Efficiency
(%)
85
84
83
82
80
75
70
35 Vin
65
60
0
2
4
6
8
10
12
14
16
18
20
48 Vin
75 Vin
81
80
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).
7
6
5.0
Power Dissipation (W)
5
4
3
2
Power Dissipation (W)
4.0
3.0
2.0
25 C
40 C
55 C
0.0
35 Vin
1
0
0
2
4
6
8
10
12
14
16
1.0
48 Vin
75 Vin
18
20
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).
20
18
16
14
I
out
(A)
12
10
8
400 LFM (2.0 m/s)
6
4
2
0
0
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
o
70
85
Ambient Air Temperature ( 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 # PQ60018EGL20
Phone 1-888-567-9596
Figure 6:
Thermal plot of converter at 20 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.# 005-2EG618G Rev. B
1/22/08
Page 5
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