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QM48S40033 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3 VDC @ 40A Output
50
40
30
50
40
30
20
10
0
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)
20
10
0
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)
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Fig. 1: Available load current vs. ambient air temperature and
airflow rates for QM48S40033 converter mounted vertically
with air flowing from pin 3 to pin 1, MOSFET temperature ≤
120 ° C, Vin = 48 V.
0.95
0.90
0.85
0.80
Ambient Temperature [°C]
Fig. 2: Available load current vs. ambient air temperature and
airflow rates for QM48S40033 converter mounted horizontally
with air flowing from pin 3 to pin 1, MOSFET temperature ≤
120 ° C, Vin = 48 V.
0.95
0.90
0.85
0.80
0.75
72 V
48 V
0.75
70 C
55 C
0.70
0.65
36 V
0.70
0.65
40 C
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Fig. 3: Efficiency vs. load current and input voltage for con-
verter mounted vertically with air flowing from pin 3 to pin 1 at a
rate of 300 LFM (1.5 m/s) and Ta = 25 ° C.
Load Current [Adc]
Fig. 4: Efficiency vs. load current and ambient temperature for
converter mounted vertically with Vin = 48 V and air flowing
from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
FEB 10, 2004 revised to NOV 13, 2006
Page 9 of 13
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