SQE48T40018 DC-DC Converter
36-75 VDC Input; 1.8 VDC @ 40 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.
i S
10 ? H
i C
source
inductance
V source
33 ? F
ESR < 1
electrolytic
capacitor
SQE48
DC-DC
Converter
1 ? F
ceramic
capacitor
Vout
Figure 11. Test setup for measuring input reflected ripple
currents, ic and is.
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-01744 Rev 1.1.1, 23-Feb-10
www.power-one.com
Page 12 of 13
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