Analog Technologies, Inc.
LED22V1A2DW
HIGH EFFICIENCY LED CONTROLLER
Main Features:
high efficiency, output current adjustable, high stability, small size, output short circuit
protection, and low cost.
Specifications
Part number:
Input voltage:
Output voltage:
Maximum output current:
Efficiency:
Dimming control voltage:
Packaging:
Operating temperature:
Dimension:
LED22V1A2DW
7V to 22V
2V to power supply voltage – 1V
1A
90% typical
1.25 to 2.5V
FR-4 PCB + epoxy
−10°C
to 85°C
16mm
×
16.7mm
×
6mm
Output Pin Description
Pin 1, SYNC
Digital input. It can be used to synchronize the LED controller switching frequency by an
external clock signal.
Pin 2, SDNG
Digital input. It can be used to shut down the LED controller, has a negative logic: 0 =
shut down and 1 = turn on, and is internally pulled up. Leaving this pin unconnected
enables the LED controller.
Pin 3, VSW
Digital output. It can be used to synchronize other LED controllers as the clock signal
source. When used as the clock master unit, a higher switching frequency unit must be
ordered and the part number becomes: LED22V1A2DWM.
Pin 4, 2.5V
Analog output. The reference voltage of 2.5V used by the controller. It has a 20ppm/°C
drift and can provide
±
1mA current.
Pin 5, LIS
Analog input/output. It can be used to set the output LED current or indicate the voltage
for setting the output LED current. The relationship between this voltage and the output
current is: LED current = (LIS (V) – 1.25V)/1.25 (A). For example, when this voltage
equals to 2V, the output LED current is (2 – 1.25)/1.25 = 0.6A. The internal circuit is
shown in Figure 1.
Pin 6, GND
Power input. Connect it to the power supply return terminal.
Pin 7, VPS
Power input. Connect it to the power supply positive terminal.
Pin 8, LEDA
Analog output. Connect it to the LED’s positive terminal, the anode.
Pin 9, LEDC
Analog output. Connect it to the LED’s negative terminal, the cathode.
Applications
The LED22V1A2DW is a compact high efficiency LED controller. No heat sink is needed for operation.
The output current can be set either by an internal POT (Potentiometer) on the top side of the controller,
by an external POT, or an external DAC (Digital to Analog Converter). The voltage required for setting
the output LED current from 0 to 1A is 1.25V to 2.5V. I.e., when setting LIS (pin 5) to 1.25V or below,
the correspondent output LED current is 0; when setting to 2.5V (the reference voltage provided by the
controller), the output current is 1A.
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089. U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770. www.analogtechnologies.com
©
Copyright 1999 – 2004, Analog Technologies, Inc. All Rights Reserved. Updated: 10/28/04
1/4
Analog Technologies, Inc.
LED22V1A2DW
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.
External Clock Signal
(Optional)
1
S1
Switch
2
On/Off
(Optional)
Switching Signal Output
(Optional)
External Dimming Control
(Optional)
3
W1
5K
2
3
1
4
5
6
7
SYNC
LED22V1A2DW
SDNG
VSW
2.5V
LIS
GND
VPS
2
2
Control Input
CW (Clock-Wise)
R2 10K
1
1
2
3
W2
10K
LEDA
LEDC
9
8
LED
0 to 1A
1W to 5W
R3 10K
1
RS 50mOhm
1
2
POT
16
±
0.1 mm
CW
2
1
R1
4.99K
Power Supply 0V
Power Supply 7V to 22V
Figure 1 Typical Application of LED Controller LED22V1A2DW
1 SYNC
2
2 SDNG
Soldering pads
Connection Wires
3 VSW
4 2.5V
5 LIS
6
7
GND
VPS
16.7
±
0.1 mm
LDA 9
LDC 8
Figure 2 Top View
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089. U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770. www.analogtechnologies.com
©
Copyright 1999 – 2004, Analog Technologies, Inc. All Rights Reserved. Updated: 10/28/04
2/4
Analog Technologies, Inc.
LED22V1A2DW
Figure 3 LED22V1A2DW Picture
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089. U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770. www.analogtechnologies.com
©
Copyright 1999 – 2004, Analog Technologies, Inc. All Rights Reserved. Updated: 10/28/04
3/4
Analog Technologies, Inc.
LED22V1A2DW
Part Numbers for Ordering
Part Number
LED22V1A2DW
LED22V1A2DWM
Note
It can be used as the
slave
unit for multiple unit operation.
It can be used as the
master
unit for multiple unit operation.
Prices and Lead-Times for Ordering
Part Number
LED22V1A2DW
LED22V1A2DWM
Lead Time
1 – 9 PCs
$28
$28
1 week
10 – 49 PCs
$24
$24
2 weeks
50 – 249 PCs
$18
$18
2 weeks
250 – 999 PCs
$14
$14
3 weeks
1000 PCs
and up
$12
$12
Contact us
Note:
ATI retains the ownership of full rights for its LED controller technologies, associated the designs for mechanics and
electronics, plus all modifications, improvements, and inventions made by ATI.
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089. U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770. www.analogtechnologies.com
©
Copyright 1999 – 2004, Analog Technologies, Inc. All Rights Reserved. Updated: 10/28/04
4/4
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