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W-6137TD-GT データシート(PDF) 14 Page - Copal Electronics

部品番号 W-6137TD-GT
部品情報  CMOS Boost Converter
Download  16 Pages
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メーカー  COPAL [Copal Electronics]
ホームページ  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

W-6137TD-GT データシート(HTML) 14 Page - Copal Electronics

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W-6137
14
Board Layout
The W-6137 is a high-frequency switching regulator.
Traces carrying high-frequency switching current have to be
carefully layout on the board in order to minimize EMI,
ripple and noise in general. The thicker lines shown on
Figure 34 indicate the switching current path. All these
traces have to be short and wide enough to minimize the
parasitic inductance and resistance. The loop shown on
Figure 34 corresponds to the current path when the
W-6137 internal switch is closed. On Figure 35 is shown
the current loop when the W-6137 switch is open. Both
loop areas should be as small as possible.
Capacitor C1 has to be placed as close as possible to the
VIN pin and GND. The capacitor C2 has to be connected
separately to the top LED anode. A ground plane under the
W-6137 allows for direct connection of the capacitors to
ground. The resistor R1 must be connected directly to the
GND pin of the W-6137 and not shared with the switching
current loops and any other components.
Figure 34. Closed
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p
O
.
5
3
e
r
u
g
i
F
p
o
o
L
t
n
e
r
r
u
C
h
c
t
i
w
s
switch Current Loop
VIN
W-6137
D
L
R1
FB
Switch
Closed
SW
GND
VIN
W-6137
D
L
R1
FB
Switch
Open
SW
GND
C2
VIN
C1
VOUT
SHDN
C1
C2
SHDN
VOUT
VIN


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