SQ48 DC-DC Series Data Sheet
36-75 VDC Input; 1.0-12 VDC Output
SQ48T/S15033 (3.3 Volt Out)
20
15
20
15
10
5
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
10
5
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
0
20
30
40
50
60
70
80
90
0
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Fig. 3.3V.3: Available load current vs. ambient air
temperature and airflow rates for SQ48S15033 converter
mounted vertically with Vin = 48V, air flowing from pin 3
to pin 1, and maximum FET temperature ≤ 120 ° C.
0.95
0.90
0.85
0.80
Ambient Temperature [°C]
Fig. 3.3V.4: Available load current vs. ambient air
temperature and airflow rates for SQ48S15033 converter
mounted horizontally with Vin = 48V, air flowing from pin
3 to pin 1, and maximum FET temperature ≤ 120 ° C.
0.95
0.90
0.85
0.80
0.75
0.70
72 V
48 V
36 V
0.75
0.70
70 C
55 C
40 C
0.65
0
2
4
6
8
10
12
14
16
0.65
0
2
4
6
8
10
12
14
16
Load Current [Adc]
Fig. 3.3V.5: Efficiency vs. load current and input voltage
for SQ48T/S15033 converter mounted vertically with air
flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5m/s)
and Ta = 25 ° C.
Load Current [Adc]
Fig. 3.3V.6: Efficiency vs. load current and ambient
temperature for SQ48T/S15033 converter mounted
vertically with Vin = 48V and air flowing from pin 3 to pin
1 at a rate of 200 LFM (1.0m/s).
Rev6 11-Apr-2011
Page 29 of 64
www.power-one.com
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