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QM48S40033 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3 VDC @ 40A Output
Fig. 9: Output voltage response to load current step-change
(20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output voltage
(100 mV/div.). Bottom trace: load current (10 A/div). Current
slew rate: 1 A/ μ s. Co = 470 μ F tantalum + 1 μ F ceramic. Time
scale: 0.2 ms/div.
Fig. 10: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 μ F tantalum + 1uF
ceramic and Vin = 48 V. Time scale: 1 μ s/div.
i S
10 μ H
i C
QmaX
Series
source
inductance
V source
33 μ F
ESR <1 ?
electrolytic
capacitor
TM
DC/DC
Converter
1 μ F
ceramic
capacitor
Vout
Fig. 11: Test setup for measuring input reflected ripple currents, i c and i s .
FEB 10, 2004 revised to NOV 13, 2006
Page 11 of 13
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