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SSQL48T20033 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
SSQL 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.
25
20
15
10
5
Available load current vs. ambient air temperature
and airflow rates for SSQL48T20033 converter
mounted vertically with air flowing from pin 3 to
pin 1, T C temperatures ≤ 120 ° C, Vin = 48 V.
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)
Figure 3. Intentionally left blank for future use.
25
20
15
10
5
0
20
30
40
50
60
70
80
90
0
20
30
40
50
60
70
80
90
100
110
Ambient Temperature [°C]
Figure 2. Power derating of SSQL48T20033 converter with
baseplate option and 0.5” tall horizontal-fin
heatsink. (Conditions: same as Figure 1)
Baseplate Temperature [°C]
Figure 4. Power derating of SSQL48T20033 converter with
baseplate option and coldplate cooling.
(Conditions: Air velocity ≤ 30LFM (≤ 0.15m/s),
Vin = 48 V, T B ≤ 85°C )
No thermal derating required.
Rev 0.2, 03-Mar-11
www.power-one.com
Page 9 of 14
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