Diodes AL8805 Manuel d'utilisateur télécharger pdf

AL8805

Document number: DS35030 Rev. 4 - 2

1 of 16

www.diodes.com

July 2012

L8805

HIGH EFFICIENCY 36V 1A BUCK LED DRIVER

Description

The AL8805 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. Series connection of the LEDs provides

identical LED currents resulting in uniform brightness and eliminating

the need for ballast resistors. The AL8805 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 AL8805 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 1A

• 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

• SOT25: 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

4SET

CTRL

GND

(Top View)

SOT25

Applications

• MR16 Lamps

• General Illumination Lamps

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 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

1 2 3 4 5 6 ... 15 16

Résumé du contenu

Page 1 - (Top View)

AL8805 Document number: DS35030 Rev. 4 - 2 1 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805HIGH EFFICIENCY 36V 1A BUCK LED DRIVER Desc

Page 2

AL8805 Document number: DS35030 Rev. 4 - 2 10 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Application Information (cont.) PWM Dimmi

Page 3 - Electrical Characteristics (V

AL8805 Document number: DS35030 Rev. 4 - 2 11 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Application Information (cont.) Soft Start

Page 4 - T = 25°C

AL8805 Document number: DS35030 Rev. 4 - 2 12 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Application Information (cont.) Diode Sel

Page 5 - R = 150m

AL8805 Document number: DS35030 Rev. 4 - 2 13 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Application Information (cont.) Thermal a

Page 6

AL8805 Document number: DS35030 Rev. 4 - 2 14 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Application Information (cont.) In Figure

Page 7

AL8805 Document number: DS35030 Rev. 4 - 2 15 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Ordering Information AL 8805 W5 - 7Pack

Page 8

AL8805 Document number: DS35030 Rev. 4 - 2 16 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Suggested Pad Layout IMPO

Page 9 - Application Information

AL8805 Document number: DS35030 Rev. 4 - 2 2 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Pin Descriptions Pin Number Pin Name Fun

Page 10 - LED current [mA

AL8805 Document number: DS35030 Rev. 4 - 2 3 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Electrical Characteristics (VIN = 12, @TA =

Page 11 - Capacitor Selection

AL8805 Document number: DS35030 Rev. 4 - 2 4 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805Typical Performance Characteristics (@TA = +

Page 12 - Diode Selection

AL8805 Document number: DS35030 Rev. 4 - 2 5 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Typical Performance Characteristics (cont.)

Page 13 - AL8805AL8805

AL8805 Document number: DS35030 Rev. 4 - 2 6 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805Typical Performance Characteristics (cont.)

AL8805 Document number: DS35030 Rev. 4 - 2 7 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Typical Performance Characteristics (cont.)

Page 15 - AL 8805 W5 - 7

AL8805 Document number: DS35030 Rev. 4 - 2 8 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805Typical Performance Characteristics (cont.)

Page 16

AL8805 Document number: DS35030 Rev. 4 - 2 9 of 16 www.diodes.com July 2012© Diodes Incorporated AL8805 Application Information AL8805 Operation I

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