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QM48T45 Family DC-DC Converter Data Sheet
36-75 VDC Input; 1.0-3.3 VDC @ 45 A Output
QM48T45033 (3.3 Volt Out)
Fig. 3.3V.7: Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48 V,
triggered via ON/OFF pin. Top trace: ON/OFF signal
(5 V/div.). Bottom trace: output voltage (1 V/div.) Time
scale: 2 ms/div.
Fig. 3.3V.9: Output voltage response to load current
step-change (22.5 A – 33.75 A – 22.5 A) at Vin = 48 V.
Top trace: output voltage (100 mV/div.). Bottom trace:
load current (10 A/div). Current slew rate: 1 A/μs. Co =
470 μF tantalum + 1 μF ceramic. Time scale: 0.2 ms/div.
Fig. 3.3V.8: Turn-on transient at full rated load current
(resistive) plus 40,000 μF at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (1 V/div.). Time scale: 2 ms/div.
Fig. 3.3V.10: Output voltage ripple (20 mV/div.) at full
rated load current into a resistive load with Co = 10 μF
tantalum + 1μF ceramic and Vin = 48 V. Time scale:
1 μs/div.
MCD10073 Rev. 1.0
Page 10 of 36
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