QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
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. 13: Test setup for measuring input reflected ripple currents, i c and i s .
Fig. 14: Input reflected ripple current, i s (10 mA/div), measured
through 10 μ H at the source at full rated load current and Vin =
48 V. Refer to Fig. 13 for test setup. Time scale: 1 μ s/div.
6.0
5.0
4.0
3.0
2.0
1.0
0
Fig. 15: Input reflected ripple current, i c (200 mA/div),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 13 for test setup. Time scale: 1 μ s/div.
0
10
20
30
40
Iout [Adc]
Fig. 16: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost
no effect on current limit characteristic.
Fig. 17: 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.
V4.0 29-March-11
Page 11 of 13
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