Technical Specification
95
90
85
90
89
88
Input:
Output:
Current:
Package:
18-36 V
5V
20 A
Quarter-brick
Efficiency (%)
Efficiency
(%)
18Vin
87
86
85
84
80
75
70
65
60
0
2
4
6
8
10
12
14
16
18
20
24Vin
36Vin
25 C
83
82
0
100
200
300
400
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).
10.0
9.5
Power Dissipation (W)
18
16
Power Dissipation (W)
14
12
10
8
6
4
2
0
0
2
4
6
8
10
12
14
16
18
20
18Vin
24Vin
36Vin
9.0
8.5
8.0
7.5
7.0
6.5
6.0
0
100
200
300
400
25 C
40 C
55 C
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
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)
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 0 LFM through 400 LFM with air flowing
from pin 1 to pin 3 (nominal input voltage).
Product # PQ24050QGA20
Phone 1-888-567-9596
Figure 6:
Thermal plot of converter at 14 amp load current (70W) with
55
°
C air flowing at the rate of 200 LFM. Air is flowing across the con-
verter from pin 1 to pin 3 (nominal input voltage).
Doc.# 005-2QG250D Rev. C
03/13/06
Page 5
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