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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)
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. 3.3V.11: Test Setup for measuring input reflected ripple currents, i c and i s .
Fig. 3.3V.12:
Input reflected ripple current,
i s
Fig. 3.3V.13:
Input reflected ripple current,
i c
(10 mA/div), measured through 10 μH at the source at
full rated load current and Vin = 48 V. Refer to
Fig. 3.3V.11 for test setup. Time scale: 1 μs/div.
4.0
3.0
2.0
1.0
0
(100 mA/div), measured at input terminals at full rated
load current and Vin = 48 V. Refer to Fig. 3.3V.11 for
test setup. Time scale: 1 μs/div.
0
15
30
45
60
Iout [Adc]
Fig. 3.3V.14: Output voltage vs. load current showing
current limit point and converter shutdown point. Input
voltage has almost no effect on current limit
characteristic.
Fig. 3.3V.15: Load current (top trace, 20 A/div,
20 ms/div) into a 10 m ? short circuit during restart, at
Vin = 48 V. Bottom trace (20 A/div, 1 ms/div) is an
expansion of the on-time portion of the top trace.
MCD10073 Rev. 1.0
Page 11 of 36
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