Performance Curves
Brick Dual
48Vin 3.3/2.5Vout 40W
Quarter
3.3Vout
2.5Vout
Figure 25:
Input reflected ripple current, is, through a 10
µ
H source
inductor at nominal input voltage and rated load current (10 mA/div).
2.5V and 3.3V outputs at 50% rated load current. (see Fig. 23)
3.0
2.8
2.6
Output Voltage
(V)
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)
3.6
3.4
3.2
Output Voltage
(V)
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0
2
35 V
48 V
75 V
4
6
8
10
12
14
16
18
20
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
0
35 V
48 V
75 V
2
4
6
8
10
12
14
Load Current
(A)
Load Current
(A)
Figure 27:
Output voltage vs. load current showing typical current limit
curves and converter shutdown points for the
2.5V
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. 2.5V load is
at 0A.
Figure 29:
Load current for
2.5V
output (10A/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 # DQ63325QMA04
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.
Bottom trace is an expansion of the on-time portion of the top trace.
Doc.# 005-2DQ632H Rev. C
7/7/04
Page 9
SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
