AL8821

Document number: DS37671 Rev. 1 - 2

1 of 14

www.diodes.com

January 2015

© Diodes Incorporated

AL8821

40V, 2A BOOST LED DRIVER

Description

The AL8821 is a boost converter that delivers an accurate constant

current for MR16 and similar LED Lamps. With proprietary control

scheme, the LED driver is compatible with many commonly used

electronic transformers and provides designs with High Power Factor

(PF) and low Total Harmonic Distortion (THD) for these applications.

The operation frequency is up to 1MHz that allows the use of small

size inductor. With the package of SO-8EP, the AL8821 has small

thermal resistance and can be used for wide range of output power.

The driver can be used for dimmable MR16 application and can be

compatible with leading-edge dimmer and trailing-edge dimmer.

Features



Wide Input Voltage Range: 5V to 36V



Internal 40V NDMOS Switches



Continuous Conduction Mode (CCM) Operation



Up to 1MHz Switching Frequency



High PF > 0.9 and Low THD < 30% and low Ripple < 20%



Compatible With Leading-edge Dimmer And Trailing-edge

Dimmer



Internal Protections



Under Voltage Lock Out (UVLO)



Output Open



Over Temperature Protection (OTP)



Pb-free SO-8EP



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



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

Pin Assignments

(Top View)

1

2

3

4

8

7

6

5

SW

CS

FB

COMP

NC

VCC

VIN

NC

EP

SO-8EP

Applications



Non-dimmable MR16 Lamps



Dimmable 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/quality/lead_free.html for more information about Diod

es 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

D2

D1

D3

D4

D5

C3

SW

CS

VCC

COMP

VIN

(Exposed Pad)

L

C4

Vac

FB