SQE48T40025 DC-DC Converter Data Sheet
36-75 VDC Input; 2.5 VDC @ 40A Output
12.00
9.00
6.00
72 V
48 V
3.00
0.00
36 V
0
5
10
15
20
25
30
35
40
45
Load Current [Adc]
Figure 4. Power dissipation vs. load current and input
voltage for SQE48T40025 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.
18.00
15.00
12.00
9.00
Figure 7. Turn-on transient at full rated load current
(resistive) plus 10,000 μF at Vin = 48 V, triggered via ON/OFF
pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Output
voltage (1.0 V/div.). Time scale: 5 ms/div.
6.00
70 C
55 C
40 C
3.00
0.00
0
8
16
24
Load Current [Adc]
32
40
48
Figure 8. Output voltage response to load current step-
change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output
voltage (20 mV/div.). Bottom trace: load current (10 A/div.).
Current slew rate: 0.1 A/μs. Co = 1 μF ceramic.
Figure 5. Power dissipation vs. load current and ambient
Time scale: 0.2ms/div.
temperature for SQE48T40025 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).
Figure 9. Output voltage response to load current step-
change (20 A – 30 A – 20A) at Vin = 48 V. Top trace: output
Figure 6. 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 (1.0 V/div.). Time scale: 5 ms/div.
voltage (100 mV/div.). Bottom trace: load current (10 A/div.).
Current slew rate: 2.5 A/μs. Co = 470 μF POS + 1 μF ceramic.
Time scale: 0.2 ms/div.
ZD-01723 Rev 1.2, 04-Jan-10
www.power-one.com
Page 11 of 13
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