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DATA SHEET
4.5
POWER DISSIPATION
Figure 4 shows the power dissipation vs. load current plot for Ta = 25 oC, airflow rate of 300 LFM (1.5 m/s) with vertical
mounting and input voltages of 36 V, 48 V, 54 V, and 72 V. Also, a plot of power dissipation vs. load current, as a function of
ambient temperature with Vin=48 V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Figure 5.
4.6
STARTUP
Output voltage waveforms, during the turn-on transient using the ON/OFF pin for full rated load currents (resistive load) are
shown without and with external load capacitance in Figure 6 and Figure 7, respectively.
4.7
RIPPLE AND NOISE
Figure 10 shows the output voltage ripple waveform, measured at full rated load current with a 10 μ F tantalum and 1 μ F
ceramic capacitor across the output. Note that all output voltage waveforms are measured across a 1 μ F ceramic capacitor.
The input reflected-ripple current waveforms are obtained using the test setup shown in Figure 11. The corresponding wave-
forms are shown in Figure 12 and Figure 13.
Figure 1. Available load current vs. ambient air temperature and
airflow rates for SQE48T40015 converter mounted vertically with
air flowing from pin 3 to pin 1, MOSFET temperature ? 120 ? C,
Vin = 48 V. Note: NC – Natural convection
40
35
30
Figure 2. Efficiency vs. load current and input voltage for
SQE48T40015 converter mounted vertically with air flowing
from pin 3 to pin 1 at 300 LFM (1.5 m/s) and Ta=25 ? C.
95
90
85
36V
48V
25
NC ~ 30 LFM (0.15 m/s)
100 LFM (0.5 m/s)
200 LFM (1 m/s)
300 LFM (1.5 m/s)
80
54V
72V
400 LFM (2 m/s)
500 LFM (2.5 m/s)
75
20
20
30
40
50
60
70
80
90
0
10
20
30
40
Ambient Temperature, C
Figure 3. Efficiency vs. load current and ambient temperature
for SQE48T40015 converter mounted vertically with Vin=48V
and air flowing from pin 3 to pin 1 at 200LFM (1.0m/s).
90
Load Current, A
Figure 4. Power dissipation vs. load current and input voltage
for SQE48T40015 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.
10
7.5
85
5
80
75
40C
55C
70C
85C
2.5
0
36V
48V
54V
72V
0
10
20
30
40
0
10
20
30
40
Load Current, A
Load Current, A
SQE48T40015 DC-DC Converter
10
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