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QM48S40033 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3 VDC @ 40A Output
Fig. 12: Input reflected ripple current, i s (10 mA/div), meas-
ured through 10 μ H at the source at full rated load current
and Vin = 48 V. Refer to Fig. 11 for test setup. Time scale:
1 μ s/div.
4.0
3.0
2.0
1.0
0
Fig. 13: Input reflected ripple current, i c (100 mA/div), meas-
ured at input terminals at full rated load current and Vin = 48
V. Refer to Fig. 11 for test setup. Time scale: 1 μ s/div.
0
15
30
45
60
Iout [Adc]
Fig. 14: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
Fig. 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 por-
tion of the top trace.
FEB 10, 2004 revised to NOV 13, 2006
Page 12 of 13
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