Diodes AL5812FF 150ma, 60v low-side adjustable linear led driver Datasheet

AL5812EV3 User Guide
150mA, 60V Low-side Adjustable Linear LED Driver
General Description
The AL5812 is an adjustable Linear LED
driver offering excellent temperature
stability and output handling capability.
The AL5812 simplifies the design of linear
and isolated or non-isolated LED drivers by
setting the LED current with standard value
resistors.
The AL5812 has an open drain output that
can swing from 1V up to 60V enabling it
drive long LED chains. Its low 0.5V RSET pin
is outside of the LED current path and so
accuracy is maintained while minimizing
the required overhead to regulate the LED
current. This reduces its power dissipation
when compared to traditional linear LED
drivers. This makes it ideal for driving LEDs
up to 150mA. Longer LED chains can be
driven by tapping VCC from the chain,
where the chain voltage may exceed 60V.
Specifications
Parameter
Value
Input Voltage
3.5V – 60V (Low Side)
>60V (Floating GND)
150mA (Adjustable)
0.62” x 0.57”
Yes
LED Current
XY Dimension
ROHS Compliance
Top-View EVM (AL5812EV3)
The AL5812EV3 evaluation board provides
U-DFN3030-6 package.
AL5812EV3 (U-DFN3030-6)
Key Features
Connection Instructions




Low Reference Voltage (VRSET=0.5V)
-40˚C to 125˚C Temperature Range
±3% LED Current Tolerance
MSOP-8EP and U-DFN3030-6 packages
Input Voltage: Red Wire
Ground: Black Wires
LED: White Wire
Applications




Linear LED Driver
Isolated Offline LED Converters
LED Signs
Instrumentation Illumination
AL5812EV3 Rev2
January 2013
www.diodes.com
Page 1 of 8
AL5812EV3 User Guide
150mA, 60V Low-side Adjustable Linear LED Driver
Board Layout
Note: By default, this evaluation board provides Low side Current LED string configuration in
this user guide document. For design flexibility, multiple application circuits can be derived in
both Low and High Side Current LED configurations with use of PWM dimming.
Evaluation Board Connection Setup and Power-up Procedure
Current LED String Procedure to Evaluation Board in Low side current LED configuration
AL5812EV3 Rev2
January 2013
www.diodes.com
Page 2 of 8
AL5812EV3 User Guide
150mA, 60V Low-side Adjustable Linear LED Driver
1.
2.
3.
4.
5.
6.
7.
By default, the evaluation board is preset at 150mA as low side current LED configuration.
Ensure that the DC source is switched OFF or disconnected.
Connect the DC line wires of power supply to VIN and GND terminals on the board.
Connect the anode wire of external LED string to VIN of the board.
Connect the cathode wire of external LED string to LED terminal of the board.
Load 10KΩ to R1 on the board. Do not load any components on R2 and R3.
Ensure that the area around the board is clear and safe, and preferably that the board and
LEDs are enclosed in a transparent safety cover.
8. Turn on the main switch. LED string should light up with LED.
Other Typical Circuit Design Options
I) Current LED String Procedure in High side current LED configuration
1.
2.
3.
4.
5.
6.
7.
8.
9.
The evaluation can be configured as High side current LED configuration.
Ensure that the DC source is switched OFF or disconnected.
Connect the line wire of the DC power supply to VIN and LED terminals on the board.
Connect the GND wire of the DC power supply to GND terminals on the board.
Connect the anode wire of external LED string to floating GND of the board.
Connect the cathode wire of external LED string to earth GND of the DC power supply.
Load 10KΩ to R1 on the board. Do not load any components on R2 and R3.
Observe MAX 60V differential between VIN and floating GND when applied VIN > 60V.
In the high side circuit configuration, extreme high voltage may be present. Please use
caution and try not to touch any components on the board or input leads.
10. Turn on the main switch. LED string should light up with LED.
AL5812EV3 Rev2
January 2013
www.diodes.com
Page 3 of 8
AL5812EV3 User Guide
150mA, 60V Low-side Adjustable Linear LED Driver
II) Current LED String Procedure in Low side current LED configuration with PWM dimming
1. The evaluation board can be configured as Low side current LED configuration with use
of PWM dimming.
2. Ensure that the DC source is switched OFF or disconnected.
3. Connect the DC line wires of power supply to VIN and GND terminals on the board.
4. Connect the anode wire of external LED string to VIN of the board.
5. Connect the cathode wire of external LED string to LED terminal of the board.
6. Load 10KΩ to R2 on the board. Do not load any components on R1 and R3.
7. Insert external MOSFET across R3 pads of the board for PWM dimming control.
8. Ensure that the area around the board is clear and safe, and preferably that the board
and LEDs are enclosed in a transparent safety cover.
9. Turn on the main switch. LED string should light up with LED.
AL5812EV3 Rev2
January 2013
www.diodes.com
Page 4 of 8
AL5812EV3 User Guide
150mA, 60V Low-side Adjustable Linear LED Driver
Schematic
For AL5812EV3 (U-DFN3030-6)
Bill of Material
Bill of Material for AL5812EV3 U-DFN3030-6 Evaluation Board (Low Side Current LED String Configuration)
#
1
2
3
4
Name
U1
C1
R1
R2, R3
AL5812EV3 Rev2
January 2013
www.diodes.com
Quantity
1
1
1
0
Part number
AL5812FF
12101C104KAT2A
RR1220P-4991-D-M
N/A
Manufacturer
Diodes Inc
AVX Corp
Susumu
N/A
Description
Adjustable Linear Driver in U-DFN3030-6
CAP CER 0.1µF 100V 10% X7R 1210
RES 4.99KΩ 1/10W 0.5% 0805 SMD
N/A
Page 5 of 8
AL5812EV3 User Guide
150mA, 60V Low-side Adjustable Linear LED Driver
Functional Performance
AL5812EV3 Rev2
January 2013
www.diodes.com
Page 6 of 8
AL5812EV3 User Guide
150mA, 60V Low-side Adjustable Linear LED Driver
AL5812EV3 Rev2
January 2013
www.diodes.com
Page 7 of 8
AL5812EV3 User Guide
150mA, 60V Low-side Adjustable Linear LED Driver
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS
DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other
changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any
liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated
convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products
described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the
companies whose products are represented on Diodes Incorporated website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized
sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall
indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized
application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names
and markings noted herein may also be covered by one or more United States, international or foreign trademarks.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems
without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided
in the labeling can be reasonably expected to result in significant injury to the user.
B.
A critical component is any component in a life support device or system whose failure to perform can be reasonably expected
to cause the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or
systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements
concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems,
notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further,
Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes
Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2013, Diodes Incorporated
www.diodes.com
AL5812EV3 Rev2
January 2013
www.diodes.com
Page 8 of 8
Similar pages