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DATA SHEET
Figure 5. Power dissipation vs. load current and ambient temperature
for SQE48T40015 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 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
(0.5 V/div.). Time scale: 5 ms/div.
10
7.5
5
40C
2.5
55C
70C
85C
0
0
10
20
30
40
Load Current, A
Figure 7. Turn-on transient at full rated load current (resistive) plus
10,000 μ F at Vin = 48 V, triggered via ON/OFF pin. Top trace:
ON/OFF signal (5 V/div.). Bottom trace: Output voltage (0.5 V/div.).
Time scale: 5 ms/div.
Figure 9. Output voltage response to load current step-change
(20 A – 30 A – 20A) at Vin = 48 V. Top trace: output voltage
(200 mV/div.). Bottom trace: load current (10 A/div.). Current
slew rate: 2.5 A/μ s. Co = 470 μ F POS + 1 μ F ceramic. Time
scale: 0.2 ms/div.
Figure 8. Output voltage response to load current step-change
(20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output voltage
(100 mV/div.). Bottom trace: load current (10 A/div.). Current
slew rate: 0.1 A/μ s. Co = 1 μ F ceramic. Time scale: 0.2ms/div.
Figure 10. Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 μ F tantalum + 1 μ F
ceramic and Vin = 48 V. Time scale: 1 μ s/div.
ZD-01745_1.1_September-10-2013
11
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