Performance Curves
Quarter
Brick
90
89
88
Efficiency (%)
95
90
85
24Vin 15Vout 6.7A
Efficiency (%)
80
75
70
65
60
0.0
0.7
1.3
2.0
2.7
3.3
4.0
4.7
5.3
6.0
6.7
18Vin
24Vin
36Vin
87
86
85
84
83
82
0
100
200
300
400
Air Flow (LFM)
25 C
40 C
55 C
500
Load Current (A)
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
0.0
0.7
1.3
2.0
2.7
3.3
4.0
4.7
5.3
9.0
8.5
8.0
7.5
7.0
6.5
6.0
25 C
40 C
55 C
18Vin
24Vin
36Vin
6.0
6.7
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).
Semiconductor junction temperature is
within 1°C of surface temperature
7
6
5
I
out
(A)
4
3
2
1
0
0
25
40
55
o
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)
70
85
Vin = 24V
Ambient Air Temperature ( 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 input to output (nominal input voltage).
Product # PQ24150QGA07
Phone 1-888-567-9596
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).
Doc.# 005-2QG215D_A
3/1/02
Page 4
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