AL8806

Document number: DS35144 Rev. 5 - 2

1 of 15

www.diodes.com

July 2013

© Diodes Incorporated

AL8806

HIGH EFFICIENCY 36V 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 36V. The AL8806 switches at frequencies 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

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.

Features



LED driving current up to 1.5A



Better than 5% accuracy



High efficiency up to 98%



Operating input voltage from 6V to 36V



High switching frequency up to 1MHz



PWM/DC input for dimming control



Built-in output open-circuit protection



MSOP-8EP: Available in “Green” Molding Compound (No Br,

Sb) with lead Free Finish/ RoHS Compliant



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

1

2

3

4

8

7

6

5

AL8806

SET

GND

GND

CTRL

V

IN

N/C

SW

SW

1

2

3

4

8

7

6

5

AL8806

SET

GND

GND

CTRL

V

IN

N/C

SW

SW

MSOP-8EP

Applications



High Power MR16 Lamps



General Illumination Lamps



Multi-Die LED Driver

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Typical Applications Circuit

AL8806

C2

1µF

R

SET

0R089

C1

450µF

D1

D2

D3

D4

D5

~

12V

AC

33µH L1

Multi-

die

LED

DFLS230LH

DFLS230LH

x4