Diodes AL8806 Manuel d'utilisateur télécharger pdf

AL8806

Document number: DS35144 Rev. 5 - 2

1 of 15

www.diodes.com

July 2013

L8806

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

connected between the V

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.

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

AL8806

SET

GND

CTRL

N/C

AL8806

SET

GND

CTRL

N/C

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

SET

CTRL

GND

1µF

SET

0R089

450µF

D2 D3

D4 D5

12V

33µH L1

Multi-

die

LED

DFLS230LH

1 2 3 4 5 6 ... 14 15

Résumé du contenu

Page 1 - MSOP-8EP

AL8806 Document number: DS35144 Rev. 5 - 2 1 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806HIGH EFFICIENCY 36V 1.5A BUCK LED DRIVER De

Page 2

AL8806 Document number: DS35144 Rev. 5 - 2 10 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Application Information (cont.) Capacit

Page 3

AL8806 Document number: DS35144 Rev. 5 - 2 11 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Application Information (cont.) PCB Lay

Page 4 - Frequency (kHz)

AL8806 Document number: DS35144 Rev. 5 - 2 12 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Application Information (cont.) Applica

Page 5 - Duty Cycle

AL8806 Document number: DS35144 Rev. 5 - 2 13 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Application Information (cont.) AL8806E

Page 6

AL8806 Document number: DS35144 Rev. 5 - 2 14 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Marking Information MSOP-8EP Part Nu

Page 7 - Application Information

AL8806 Document number: DS35144 Rev. 5 - 2 15 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 IMPORTANT NOTICE DIODES INCORPORATED

Page 8 - LED current [mA

AL8806 Document number: DS35144 Rev. 5 - 2 2 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Pin Descriptions Pin Name Pin Number Fu

Page 9 - Reducing Output Ripple

AL8806 Document number: DS35144 Rev. 5 - 2 3 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Absolute Maximum Ratings (@TA = +25°C, un

Page 10 - Diode Selection

AL8806 Document number: DS35144 Rev. 5 - 2 4 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Typical Performance Characteristics 05

Page 11 - Application Example

AL8806 Document number: DS35144 Rev. 5 - 2 5 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Typical Performance Characteristics (cont

Page 12

AL8806 Document number: DS35144 Rev. 5 - 2 6 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Typical Operating Performance Characteris

Page 13 - AL8806 XXX - XX

AL8806 Document number: DS35144 Rev. 5 - 2 7 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Application Information AL8806 Operation

Page 14 - Detail C

AL8806 Document number: DS35144 Rev. 5 - 2 8 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Application Information (cont.) PWM Dimm

AL8806 Document number: DS35144 Rev. 5 - 2 9 of 15 www.diodes.com July 2013© Diodes Incorporated AL8806 Application Information (cont.) Soft Sta

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