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QM48S40033 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3 VDC @ 40A Output
16.00
12.00
8.00
72 V
16.00
12.00
8.00
70 C
4.00
0.00
48 V
36 V
4.00
0.00
55 C
40 C
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Fig. 5: Power dissipation vs. load current and input voltage for
converter 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.
Fig. 7: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 48 V, triggered via ON/OFF
pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: output
voltage (1 V/div.) Time scale: 2 ms/div.
Load Current [Adc]
Fig. 6: Power dissipation vs. load current and ambient tem-
perature 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).
Fig. 8: Turn-on transient at full rated load current (resistive)
plus 40,000 μ F at Vin = 48 V, triggered via ON/OFF pin. Top
trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage
(1 V/div.). Time scale: 2 ms/div.
FEB 10, 2004 revised to NOV 13, 2006
Page 10 of 13
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