AL8821 Datasheet, PDF (1/14 Pages) Diodes Incorporated – 40V, 2A BOOST LED DRIVER

Description
Pin Assignments
AL8821
40V, 2A BOOST LED DRIVER
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)
(Top View)
SW 1
CS 2
EP
FB 3
COMP 4
Applications
SO-8EP
 Non-dimmable MR16 Lamps
 Dimmable MR16 Lamps
 General Illumination Lamps
8 NC
7 VCC
6 VIN
5 NC
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
L
Vac
D1 D2
D5
D3
D4
CO
AL8821
Document number: DS37671 Rev. 1 - 2
RSET
RHYS
SW
VIN
CS
VCC
FB
C3
COMP
C4
(Exposed Pad)
1 of 14
www.diodes.com
RFB
January 2015
© Diodes Incorporated