Performance Curves
Brick Dual
Quarter
48V 3.3/1.8V
77W
out
in
1.8Vout
3.3Vout
Figure 19: Input Reflected Ripple Current, i , through a 10
µ
H source
Figure 20: Output Voltage Ripple at nominal input voltage and rated
s
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)
load current on both outputs (20 mV/div). Load capacitance: 1µF
ceramic & 15
µF tantalum. Bandwidth: 20 MHz. (see Fig. 17)
2.5
2.0
1.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
1.0
35 V
35 V
48 V
75 V
0.5
0.0
48 V
75 V
0.0
0
5
10
15
20
0
5
10
15
20
Load Current (A)
Load Current (A)
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
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 m
Ω
short circuit.
when the converter attempts to turn on into a 10 m
Ω
short circuit.
Bottom trace is an expansion of the on-time portion of the top trace.
Product # DQ63318QGL08 Phone 1-888-567-9596
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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