RT4533/A
The inductor should be placed as close as
possible to the switch pin to minimize the
noise coupling into other circuits.
LX node copper area should be minimized
for reducing EMI.
The C
should be connected
OUT
directly from the output schottky
diode to ground rather than
across the WLEDs
GND
C
OUT
D
V
IN
L
C
should be placed
IN
LX
VIN
1
2
3
6
5
4
as closed as possible
to VIN pin for good
filtering.
C
IN
VOUT
EN
GND
R
SET
FB
WLEDs
It recommended to add 100 Ohm
between IC's V and WLED's
anode for improving system ESD
level.
FB node copper area should be
minimized and keep far away
from noise sources (LX pin) and
RS should be as close as
possible to FB pin.
OUT
Figure 2. PCB Layout Guide
Copyright 2015 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS4533/A-02 September 2015
www.richtek.com
10
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