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SQL48T20033 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3 VDC @ 20A Output
Ripple and Noise
i S
i C
Figure 13 shows the output voltage ripple waveform,
measured at full rated load current with a 10μF
tantalum and a 1μF ceramic capacitor across the
output. Note that all output voltage waveforms are
measured across the 1μF ceramic capacitor.
10 μ H
source
inductance
V source
33 μ F
ESR < 1 ?
electrolytic
capacitor
SQL 48
DC -DC
Converter
1 μ F
Ceramic
+ 10 μ F
Tantalum
Capacitor
Vout
The input reflected-ripple current waveforms are
obtained using the test setup shown in Fig. J. The
corresponding waveforms are shown in Figure 14, and
Figure 15.
25
20
15
Fig. J:
25
20
15
Test setup for measuring input reflected ripple
currents, i c and i s .
10
5
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)
10
5
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]
Ambient Temperature [°C]
Figure 1.
Available load current vs. ambient air temperature
Figure 3. Power derating of SQL48T20033 converter with
25
20
15
and airflow rates for SQL48T20033 converter
mounted vertically with air flowing from pin 3 to
pin 1, Tc temperatures ≤ 120 ° C, Vin = 48 V.
25
20
15
baseplate option and 0.91” tall horizontal-fin
heatsink. (Conditions: same as Figure 1)
No thermal derating required.
10
5
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)
10
5
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
100
110
Ambient Temperature [°C]
Figure 2. Power derating of SQL48T20033 converter with
baseplate option and 0.25” tall horizontal-fin
heatsink. (Conditions: same as Figure 1)
Baseplate Temperature [°C]
Figure 4. Coldplate cooling: Power derating of
SQL48T20033-xxxBx converter with baseplate option
and coldplate cooling. No thermal derating required.
(Conditions: Air velocity ≤ 30LFM (≤ 0.15m/s),
Vin = 48 V, T B ≤ 105°C)
Rev 0.2, 3-Mar-11
www.power-one.com
Page 9 of 14
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