AL8806 Datasheet, PDF (1/15 Pages) Diodes Incorporated – HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER

AL8806
HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER
Description
The AL8806 is a step-down DC/DC converter designed to
drive LEDs with a constant current. The device can drive up
to 8 LEDs, depending on the forward voltage of the LEDs, in
series from a voltage source of 6V to 30V. The AL8806
switches at frequency up to 1MHz. This allows the use of
small size external components, hence minimizing the PCB
area needed.
Maximum output current of AL8806 is set via an external
resistor connected between the V_IN and SET input pins.
Dimming is achieved by applying either a DC voltage or a
PWM signal at the CTRL input pin. An input voltage of 0.4V
or lower at CTRL switches off the output MOSFET simplifying
PWM dimming.
Pin Assignments
MSOP-8EP
SET 1
GND 2
GND 3
CTRL 4
8 V_IN
AL8806 ^{7 N/C}
6 SW
5 SW
Features
• LED driving current up to 1.5A
• Better than 5% accuracy
• High efficiency up to 98%
• Operating input voltage from 6V to 30V
• High switching frequency up to 1MHz
• PWM/DC input for dimming control
• Built-in output open-circuit protection
• MSOP8-EP: Available in “Green” Molding Compound (No
Br, Sb) with lead Free Finish/RoHS Compliant (Note 1)
Applications
• High power MR16 lamps
• General illumination lamps
• Multi-die LED driver
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at:
http://www.diodes.com/products/lead_free.html
Typical Application Circuit
D2 D3
DFLS230LH
D1
R_SET
0R089
~
12V_AC
DFLS230LH
x4
C1
450µF
D4 D5
AL8806
C2
1µF
33µH L1
Multi-
die
LED
AL8806
Document number: DS35144 Rev. 2 - 2
1 of 15
www.diodes.com
June 2011
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