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參數(shù)資料
| 型號(hào)： | SQL48T20033-NDABG |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, ONE-EIGHTH BRICK PACKAGE-8 |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 773K |
| 代理商： | SQL48T20033-NDABG |
Rev 0.2, 3-Mar-11
www.power-one.com
Page 9 of 14
SQL48T20033 DC-DC Converter
36-75 VDC Input; 3.3 VDC @ 20A Output
Preliminary Data Sheet
Ripple and Noise
Figure 13 shows the output voltage ripple waveform,
measured at full rated load current with a 10F
tantalum and a 1F ceramic capacitor across the
output. Note that all output voltage waveforms are
measured across the 1F ceramic capacitor.
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
Ambient Temperature [°C]
20
30
40
50
60
70
80
90
Load
Cu
rr
ent
[A
dc]
0
5
10
15
20
25
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 1.
Available load current vs. ambient air temperature
and airflow rates for SQL48T20033 converter
mounted vertically with air flowing from pin 3 to
pin 1, Tc temperatures
120 C, Vin = 48 V.
Ambient Temperature [°C]
20
30
40
50
60
70
80
90
Load
Cu
rr
ent
[A
dc]
0
5
10
15
20
25
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 2. Power derating of SQL48T20033 converter with
baseplate option and 0.25” tall horizontal-fin
heatsink. (Conditions: same as Figure 1)
Fig. J:
Test setup for measuring input reflected ripple
currents,
ic and is.
Ambient Temperature [°C]
20
30
40
50
60
70
80
90
Load
Cu
rr
ent
[A
dc]
0
5
10
15
20
25
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. Power derating of SQL48T20033 converter with
baseplate option and 0.91” tall horizontal-fin
heatsink. (Conditions: same as Figure 1)
No thermal derating required.
Baseplate Temperature [°C]
20
30
40
50
60
70
80
90
100
110
Load
Cu
rr
ent
[A
dc]
0
5
10
15
20
25
Figure 4.
Coldplate cooling: Power derating of
SQL48T20033-xxxBx converter with baseplate option
and coldplate cooling. No thermal derating required.
(Conditions: A
ir velocity ≤ 30LFM (≤ 0.15m/s),
Vin = 48 V, TB ≤ 105°C)
Vout
Vsource
i
S
i
C
1
F
Ceramic
+ 10 F
Tantalum
Capacitor
10
H
source
inductance
DC-DC
Converter
33
F
ESR < 1
electrolytic
capacitor
SQL 48
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