W-6139TD-GT datasheet(11/13 Pages) COPAL

No de pièce	W-6139TD-GT

Description	22 V High Current Boost

Download	13 Pages

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Fabricant	COPAL [Copal Electronics]

Site Internet	http://www.nidec-copal-electronics.com/e

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11 / 13 page

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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p

O

.

7

2

e

r

u

g

i

F

p

o

L

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C

h

c

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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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