Performance Curves
Brick Dual
48Vin 3.3/1.8Vout 77W
Quarter
1.8Vout
3.3Vout
Figure 19:
Input Reflected Ripple Current, is, through a 10
µ
H source
inductor at nominal input voltage and rated load current (5 mA/div).
1.8V and 3.3V outputs at full rated load current. (see Fig. 17)
2.5
Figure 20:
Output Voltage Ripple at nominal input voltage and rated
load current on both outputs (20 mV/div). Load capacitance: 1
µ
F
ceramic & 15
µ
F tantalum. Bandwidth: 20 MHz. (see Fig. 17)
4.0
3.5
Output Voltage
(V)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
5
10
Load Current
(A)
15
20
0
5
10
Load Current
(A)
15
20
35 V
48 V
75 V
2.0
Output Voltage
(V)
1.5
1.0
35 V
0.5
48 V
75 V
0.0
Figure 21:
Output voltage vs. load current showing typical current limit
curves and converter shutdown points for the
1.8V
output. 3.3V load is
at 0A.
Figure 22:
Output voltage vs. load current showing typical current limit
curves and converter shutdown points for the
3.3V
output. 1.8V load is
at 0A.
Figure 23:
Load current for
1.8V
output (20A/div) as a function of time
when the converter attempts to turn on into a 10 mΩ short circuit.
Bottom trace is an expansion of the on-time portion of the top trace.
Product # DQ63318QGL08
Phone 1-888-567-9596
Figure 24:
Load current for
3.3V
output (20A/div) as a function of time
when the converter attempts to turn on into a 10 mΩ short circuit.
Bottom trace is an expansion of the on-time portion of the top trace.
Doc.# 005-2DQ638D Rev. B
10/7/03
Page 8
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