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© Copyright 1999 – 2004, Analog Technologies, Inc. All Rights Reserved. Updated: 10/28/04
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LED22V1A2DW
Analog Technologies, Inc.
When using multiple LED22V1A2DW units within one system, it would be better to have all their
switching frequencies synchronized, thus minimizing the ripple voltage across the power supply and
interferences to other electronics. Two ways to synchronize their switching frequencies:
1. Use an external clock signal of between 750KHz to 1MHz and connect it to the SYNC pins (#1) of all
the controllers.
2. Use one of the LED controllers as a master unit (ordering part number: LED22V1A2DWM) and the rest
as slave units. Connect the VSW pin (#3) of the master unit to the SYNC pins (#1) of all the slave
units.
Figure 1 shows the connection for typical applications. Please note that all the optional connections are not
necessary for the controller to operate. The circuitries shown inside the controller boarder are the internal
circuits embedded in the controller. Figure 2 shows the top view of the controllers and its connection
wires, the POT, and the soldering pads for the optional connections.
1
3
W1
5K
GND
6
VPS
7
VSW
3
2.5V
4
LIS
5
SDNG
2
SYNC
1
LEDC
8
LEDA
9
LED22V1A2DW
Switching Signal Output
Power Supply 0V
S1
Switch
External Clock Signal
External Dimming Control
On/Off
LED
1W to 5W
Power Supply 7V to 22V
Figure 1 Typical Application of LED Controller LED22V1A2DW
0 to 1A
1
2
RS 50mOhm
2
W2
10K
1
2
R2 10K
Control Input
CW (Clock-Wise)
CW
(Optional)
(Optional)
(Optional)
1
2
R3 10K
R1
4.99K
(Optional)
Soldering pads
Figure 2 Top View
POT
9
16
± 0.1 mm
16.7
± 0.1 mm
LIS
SDNG
8
7
6
5
4
3
2
1
2
VPS
2.5V
VSW
SYNC
LDC
LDA
GND
Connection Wires
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