PQ60025QGA25 Datasheet, PDF (5/13 Pages) SynQor Worldwide Headquarters – 25 Amp, No Heatsink, Isolated DC/DC Converter

Performance Curves
Quarter
Brick
48Vin 2.5Vout 25A
90
85
80
75
70
36 Vin
65
48 Vin
75 Vin
60
0
3
5
8
10 13 15 18 20 23 25
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for min-
imum, nominal, and maximum input voltage at 25°C.
12
10
8
6
4
36 Vin
2
48 Vin
75 Vin
0
0
3
5
8
10
13
15
18
20
23
25
Load Current (A)
Figure 3: Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25°C.
25
20
15
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
0
0
25
40
55
70
85
Ambient Air Temperature (^oC)
Figure 5: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
across the converter from pin 3 to pin 1 (nominal input voltage).
Product # PQ60025QGA25
Phone [phone]
90
89
88
87
86
85
84
83
82
0
25 C
40 C
55 C
100
200
300
400
500
Air Flow (LFM)
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).
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
0
25 C
40 C
55 C
100
200
300
400
500
Air Flow (LFM)
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
Figure 6: Thermal plot of converter at 25 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.# 005-2QG625D Rev. B
6/26/02
Page 5