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SSQE48T25018 DC-DC Converter
36-75 VDC Input; 1.8 VDC, 25 A Output
Data Sheet
Figure 10. Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 μF
tantalum + 1 μF ceramic and Vin = 48 V. Time
scale: 1 μs/div.
i S
i C
Figure 13.
2.0
1.5
Input reflected ripple-current, i C (200 mA/div.),
measured at input terminals at full rated load
current and Vin = 48 V. Refer to Figure 11 for
test setup. Time scale: 1 μs/div.
10 μ H
source
inductance
V source
33 μ F
ESR < 1 ?
electrolytic
capacitor
SSQE48
DC-DC
Converter
1 μ F
Ceramic
+ 10 μ F
Tantalum
Capacitor
Vout
1.0
0.5
Figure 11. Test setup for measuring input reflected ripple
currents, ic and is.
0
0
10
20
30
40
Iout [ADC]
Figure 14. Output voltage vs. load current showing current
limit point and converter shutdown point. Input
voltage has almost no effect on current limit
characteristic.
Figure 12. Input reflected-ripple current, i S (10 mA/div.),
measured through 10 μH at the source at full
rated load current and Vin = 48 V. Refer to Figure
11 for test setup. Time scale: 1 μs/div.
Figure 15. Load current (top trace, 20 A/div., 50 ms/div.) into
a 10 m ? short circuit during restart, at Vin = 48 V.
Bottom
trace
(10
A/div.,
5 ms/div.)
is
an
expansion of the on-time portion of the top trace
ZD-02091 Rev. 1.0
www.power-one.com
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