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QD48T025033 DC-DC Converter Data Sheet
36-75 VDC Input; 2.5 and 3.3VDC @ 15A Outputs
Fig. 24: Output voltage response to both Iout1 and Iout2 (out
of phase) load current step-change of 3.75 A (50%-75%-50%)
at Vin = 48 V. Ch1 = Vout1 (50 mV/div), Ch2 = Vout2 (50
mV/div), Ch3 = Iout1 (10 A/div.), Ch4 = Iout2 (10 A/div.).
Current slew rate: 0.1 A/ μ s, Co = 10 μ F tantalum + 1 μ F
ceramic. Time scale: 1 ms/div.
4.0
3.0
Vout1
2.0
1.0
0
Fig. 25: Output voltage response to both Iout1 and Iout2 (out
of phase) load current step-change of 3.75 A (50%-75%-50%)
at Vin = 48 V. Ch1 = Vout1 (100 mV/div), Ch2 = Vout2 (100
mV/div), Ch3 = Iout1 (10 A/div.), Ch4 = Iout2 (10 A/div.).
Current slew rate: 5 A/ μ s, Co = 300 μ F tantalum + 1 μ F
ceramic. Time scale: 1 ms/div.
Note: The only cross-talk during transient is due to the
common RETURN pin for both outputs.
4.0
Vout2
3.0
2.0
1.0
0
0
5
10
15
20
0
5
10
15
20
Iout [Adc]
Fig. 26: Output voltage Vout1 vs. load current Iout1 showing
current limit point and converter shutdown point. When Vout1
is in current limit, Vout2 is not affected until Vout1 reaches the
shut-down threshold of 60% of its nominal value. Input voltage
has almost no effect on Vout1 current limit characteristic.
Iout [Adc]
Fig. 27: Output voltage Vout2 vs. load current Iout2 showing
current limit point and converter shutdown point. When Vout2
is in current limit, Vout1 is not affected until Vout2 reaches the
shut-down threshold equal to Vout1 - 0.6 V. Input voltage has
almost no effect on Vout2 current limit characteristic.
MCD10084 Rev. 1.0, 25-Sep-08
Page 13 of 15
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