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GAQ37S12B-4
DC-DC Converter Technical Manual V1.0
Typical Waveforms
1. During the test of input reflected ripple current, the input terminal must be connected to the external input filter (include a 12
µH inductor and a 220 µF electrolytic capacitor), which is not required in other tests.
2. Point B, which is for testing the output voltage ripple, is 25 mm (0.98 in.) away from the V
L
A
V
(+)
in
C
converter
V
s
V
(-)
in
470 µF
External
Input
Aluminum
Filter
electrolytic
capacitor
Figure 5: Test set-up diagram
I
s
Figure 7: Input reflected ripple current
(for point A in the test set-up diagram, V
V
= 12 V, I
= 37 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
Electrolytic
capacitor
capacitor
= 48 V,
in
(+) pin.
out
F1
V
in
EMI
C
in
filtering
On/Off
V
S1
source
V
in
Figure 6: Typical circuit applications
F1: 25 A fuse (fast blowing)
C
: The 470 µF aluminum electrolytic capacitor is recommended.
in
C
: The 1 µF ceramic capacitor is recommended.
o1
C
: The 470 µF electrolytic capacitor is recommended.
o2
V
out
Figure 8: Output voltage ripple
(for point B in the test set-up diagram, V
V
= 12 V, I
= 37 A)
out
out
6
V
(+)
out
(+)
Load
Sense(+)
C
C
o1
o2
Trim
-
Sense(
)
(-)
-
V
(
)
out
= 48 V,
in
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