Performance Curves
Brick Dual
48Vin 3.3/2.5Vout 87W
3.3Vout
2.5Vout
3.3Vout
2.5Vout
Quarter
Figure 13:
Turn-on transient at full rated load current (resistive load)
(10 ms/div). Ch 1: 2.5Vout (1V/div); Ch 2: 3.3Vout (1V/div)
Ch 3: ON/OFF input (5V/div)
Figure 14:
Turn-on transient at zero load current (10 ms/div).
Ch 1: 2.5Vout (1V/div); Ch 2: 3.3Vout (1V/div)
Ch 3: ON/OFF input (5V/div)
2.5Vout
2.5Vout
2.5
I
out
3.3Vout
2.5
I
out
3.3Vout
3.3
I
out
3.3
I
out
Figure 15:
Output voltage response to step-change in Iout1 (50%-75%-50% of
Imax; dI/dt = 0.1A/µs). Load cap: 15µF, 300 m
Ω
ESR tantalum & 1µF ceramic.
Vout (100mV/div), Iout (10A/div). Ch1: Vout1; Ch2 Iout1; Ch 3: Vout2; Ch 4 Iout2
Figure 16:
Output voltage response to step-change in Iout2 (50%-75%-50% of
Imax; dI/dt = 0.1A/µs). Load cap: 15µF, 300 m
Ω
ESR tantalum & 1µF ceramic.
Vout (100mV/div), Iout (10A/div). Ch1: Vout1; Ch2 Iout2; Ch 3: Vout2; Ch 4 Iout2
Figure 19
source
impedance
10
µ
H
Figure 18
Figure 20
V
OUT2+
i
S
V
SOURCE
i
C
DC/DC
Converter
1
µ
F
V
OUT1+
15 µF,
300mΩ ESR
tantalum
capacitors
100 µF,
<1Ω ESR
electrolytic
capacitor
ceramic
capacitors
COM
(-)
Figure 17:
Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 18), Input Reflected Ripple Current
(Figure 19) and Output Voltage Ripple (Figure 20).
Product # DQ63325QGL09
Phone 1-888-567-9596
Figure 18:
Input Terminal Ripple Current, 2.5V & 3.3V outputs at full
rated output current and nominal input voltage with 10
µ
H source
impedance and 100
µ
F electrolytic capacitor (10 mA/div). (see Fig. 17)
Doc.# 005-2DQ632D Rev. B
10/7/03
Page 7
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