Performance Curves
Brick Dual
Quarter
48V 3.3/1.8V
77W
out
in
Semiconductor junction temperature is
within 1 C of surface temperature
°
Figure 13: Turn-on transient at full rated load current (resistive load)
(10 ms/div). Ch 1: 1.8Vout (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: 1.8Vout (1V/div); Ch 2: 3.3Vout (1V/div)
Ch 3: ON/OFF input (5V/div)
1.8Vout
1.8Vout
1.8Iout
1.8Iout
3.3Vout
3.3Vout
3.3Iout
3.3Iout
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 15: Output voltage response to step-change in Iout1 (50%-75%-50% of
Figure 16: Output voltage response to step-change in Iout2 (50%-75%-50% of
Imax; dI/dt = 0.1A/
µ
s). Load cap: 15
µ
F, 300 m
Ω
ESR tantalum & 1
µ
F ceramic.
Imax; dI/dt = 0.1A/µs). Load cap: 15µF, 300 mΩ ESR tantalum & 1µF ceramic.
Vout (100mV/div), Iout (10A/div). Ch1: Vout1; Ch2 Iout1; Ch 3: Vout2; Ch 4 Iout2
Vout (100mV/div), Iout (10A/div). Ch1: Vout1; Ch2 Iout2; Ch 3: Vout2; Ch 4 Iout2
Figure 19
10 µH
Figure 18
source
Figure 20
impedance
VOUT2
+
iS
iC
DC/DC
Converter
VOUT1
+
VSOURCE
15
µ
Ω
F,
ESR
1 µF
100 µF,
ceramic
300m
<1
Ω ESR
capacitors
tantalum
electrolytic
capacitor
capacitors
Semiconductor junction temperature is
within 1°C of surface temperature
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).
Figure 18: Input Terminal Ripple Current, 1.8V & 3.3V outputs at full
rated output current and nominal input voltage with 10 H source
impedance and 100 F electrolytic capacitor (10 mA/div). (see Fig. 17)
µ
µ
Product # DQ63318QGL08
Phone 1-888-567-9596
Doc.# 005-2DQ638D Rev. B 10/7/03 Page 7
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