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W-6139TD-GT データシート(PDF) 11 Page - Copal Electronics

部品番号 W-6139TD-GT
部品情報  22 V High Current Boost
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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-6139TD-GT データシート(HTML) 11 Page - Copal Electronics

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W-6139
11
Board Layout
The W-6139 is a high-frequency switching regulator.
The traces that carry the high-frequency switching current
have to be carefully laid out on the board in order to
minimize EMI, ripple and noise in general. The thicker lines
on Figure 26 show 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 26 corresponds to the current path when the
W-6139 internal switch is closed. On Figure 27 is shown
the current loop, when the W-6139 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-6139 allows for direct connection of the capacitors to
ground. The resistor R1 must be connected directly to the
GND pin of the W-6139 and not shared with the switching
current loops and any other components.
Figure 26. Closed
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O
.
7
2
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i
F
p
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o
L
t
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C
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s
switch Current Loop
VIN
W-6139
V
D
L
OUT
R1
FB
Switch
Closed
SW
GND
VIN
W-6139
D
L
R1
FB
Switch
Open
SW
GND
SHDN
C1
C2
VIN
C2
C1
SHDN
VIN
VOUT
Figure 28. Recommended PCB Layout


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