Performance Curves
Brick Dual
48Vin 3.3/1.8Vout 40W
Quarter
1.8Vout
3.3Vout
Figure 25:
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 50% rated load current. (see Fig. 23)
Figure 26:
Output voltage ripple at nominal input voltage and 50%
rated load current on both outputs (20 mV/div). Load capacitance: 1
µ
F
ceramic cap & 15
µ
F tantalum cap. Bandwidth: 20 MHz. (see Fig. 23)
3.0
2.5
Output Voltage
(V)
2.0
1.5
1.0
0.5
0.0
0
5
10
15
Load Current
(A)
20
25
30
Output Voltage
(V)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0
5
Load Current
(A)
10
15
35 V
48 V
75 V
35 V
48 V
75 V
Figure 27:
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 28:
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 29:
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. Top
trace is an expansion of the on-time portion of the bottom trace.
Product # DQ63318QMA04
Phone 1-888-567-9596
Figure 30:
Load current for
3.3V
output (10A/div) as a function of time
when the converter attempts to turn on into a 10 mΩ short circuit. Top
trace is an expansion of the on-time portion of the bottom trace.
Doc.# 005-2DQ638H Rev. A
1/10/03
Page 9
SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
