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SQE48T50012 DC-DC Converter
36-75 VDC Input; 1.2 VDC @ 50 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.
Figure 13. Input reflected ripple-current, i c (100 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.
2.0
i S
10 μ H
i C
1.5
source
inductance
V source
33 μ F
ESR < 1 ?
electrolytic
capacitor
SQE48
DC-DC
Converter
1 μ F
ceramic
capacitor
Vout
1.0
0.5
0
Figure 11. Test setup for measuring input reflected ripple
0
18
36
54
72
currents, ic and is.
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, 50 A/div., 50 ms/div.) into
a 10 m ? short circuit during restart, at Vin = 48 V.
Bottom trace (50 A/div., 5 ms/div.) is an
expansion of the on-time portion of the top trace.
ZD-01731 Rev 2.0
www.power-one.com
Page 12 of 13
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