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GAQ40S3V3B
DC-DC Converter Technical Manual V1.4
Typical Waveforms
1. During the test of input reflected ripple current, the input terminal must be connected to a 12 µH inductor and a 220 µF
electrolytic capacitor.
2. Point B, which is for testing the output voltage ripple, is 25 mm (0.98 in.) away from the V
12 µH
A
V
(+)
in
converter
V
source
V
(–)
in
220 µF
47 µF
Electrolytic
Electrolytic
capacitor
capacitor
Figure 5: Test set-up diagram
Is
Figure 7: Input reflected ripple current
(for point A in the test set-up diagram, V
V
= 3.3 V; I
= 40 A)
out
out
GLOBAL ENERGY EFFICIENCY SPECIALIST
10 µF
25 mm (0.98 in.)
Tantalum
capacitor
B
V
(+)
out
Load
DC-DC
V
(–)
out
0.1 µF
470 µF
Ceramic
Tantalum
capacitor
capacitor
= 48 V;
in
(+) pin.
out
F1
V
in
EMI
C
in
filtering
On/Off
V
S1
source
Vi
Figure 6: Typical circuit applications
F1: 7 A fuse (fast blowing)
C
: The high-frequency, low equivalent series resistance
in
(ESR) electrolytic capacitor (100 µF/100 V) is
recommended.
C
: The 1 µF ceramic capacitor is recommended.
o1
C
: The 470 µF tantalum capacitor is recommended.
o2
V
out
Figure 8: Output voltage ripple
(for point B in the test set-up diagram, V
V
= 3.3 V; I
= 40 A)
out
out
6
V
(+)
out
(+)
Load
Sense(+)
C
C
o1
o2
Trim
Sense(–)
(–)
V
(–)
n
out
= 48 V;
in
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