Performance Curves
Brick
Quarter
24V 15V
6.7A
out
in
Figure 15
3.3 µH
Figure 14
source
impedance
Figure 16
iS
iC
DC/DC
Converter
VOUT
VSOURCE
10
µ
Ω
F,
ESR
1 µF
100
µ
F,
ESR
ceramic
100m
0.33
Ω
capacitor
tantalum
electrolytic
capacitor
capacitor
Figure 13: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 14), Input Reflected Ripple Current
(Figure 15) and Output Voltage Ripple (Figure 16).
Figure 14: Input Terminal Ripple Current, i , at full rated output cur-
c
rent and nominal input voltage with 3.3
µH source impedance and
100 F electrolytic capacitor (500 mA/div). See Figure 13.
µ
Figure 15: Input reflected ripple current, i , through a 3.3µH source
Figure 16: Output voltage ripple at nominal input voltage and rated
load current (50 mV/div). Load capacitance: 1 F ceramic capacitor
and 10 F tantalum capacitor. Bandwidth: 20 MHz. See Figure 13.
s
inductor at nominal input voltage and rated load current (20 mA/div).
See Figure 13.
µ
µ
To be provided in future revision
Figure 17: Output voltage vs. load current showing typical current limit
Figure 18: Load current (10A/div) as a function of time when the con-
verter attempts to turn on into a 10 m short circuit. Top trace
(2.5ms/div) is an expansion of the on-time portion of the bottom trace.
curves and converter shutdown points.
Ω
Product # PQ24150QGA07
Phone 1-888-567-9596
Doc.# 005-2QG215D_A 3/1/02 Page 6
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