AL8820

Document number: DS37369 Rev. 1 - 2

1 of 15

www.diodes.com

December 2014

© Diodes Incorporated

AL8820

40V, 2A BOOST/BUCK LED DRIVER

Description

The AL8820 is a highly integrated high performance LED driver

optimized for MR16/AR111 and other similar LED lamp applications.

With a proprietary control scheme, the LED driver is compatible with

many commonly used electronic transformers and meets High Power

Factor (PF) and low Total Harmonic Distortion (THD) requirements for

these applications.

The device integrates two DC/DC converters. The Two stage design

offers superior performance for MR16/AR111 applications. The first

stage is a boost PFC stage which improves PF, reduces EMI, powers

up the Buck stage and the compatibility of Electronic Transformers.

The Buck stage regulates the LED current thru the setting of external

reduce the conduction power loss. A compact thermally efficient SO-

8EP package, the AL8820 provides an ideal solution for MR16/AR111

applications.

Features



Wide Input Voltage Range: 5V to 36V



Internal 40V NDMOS Switch



2A Output Current



Continuous Conduction Mode (CCM) Operation



Up to 1MHz Switching Frequency



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



Internal Protections



Under Voltage Lock Out (UVLO)



Output Open/Short Protection



Over Temperature Protection (OTP)



SO-8EP



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



Halogen and Ant

imony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

SO-8EP

Applications



MR16 Lamps



AR111



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 Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-free "Gree

n” 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

D6

R1

R2

C1

C2

C3

SW1

CS1

FB

COMP

SW2

VCC

VIN

CS2

(Exposed Pad)

L2

L3

C4

C5

Vac

L1

1

2

3

4

8

7

6

5

SW1

CS1

FB

COMP

SW2

VCC

VIN

CS2

EP