Performance Curves
Brick
Quarter
24V 15V
6.7A
out
in
95
90
85
80
75
70
65
60
90
89
88
87
86
85
84
83
25 C
40 C
55 C
18Vin
24Vin
36Vin
82
0
100
200
Air Flow (LFM)
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
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
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
18
16
14
12
10
8
6
4
18Vin
24Vin
36Vin
25 C
40 C
55 C
2
0
0.0
0.7
1.3
2.0
2.7
3.3
4.0
4.7
5.3
6.0
6.7
0
100
200
Air Flow (LFM)
300
400
500
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
6
5
4
Semiconductor junction temperature is
within 1 C of surface temperature
°
3
400 LFM (2.0 m/s)
2
1
0
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
0
25
40
55
70
85
Ambient Air Temperature (oC)
Vin = 24V
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 input to output (nominal input voltage).
Figure 6: Thermal plot of converter at 4.5 amp load current with 55°C
air flowing at the rate of 200 LFM. Air is flowing across the converter
from input to output (nominal input voltage).
Product # PQ24150QGA07
Phone 1-888-567-9596
Doc.# 005-2QG215D_A
3/1/02
Page 4
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