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Diodes Semiconductor Electronic Components Datasheet


AL8821

2A BOOST LED DRIVER


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AL8821 pdf
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
FB 3
COMP 4
EP
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



No Preview Available !

AL8821 pdf
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
Pin Name
SW
CS
FB
COMP
NC
VIN
VCC
NC
Exposed Pad
Function
Integrated MOS Drain
Input Current Sense Pin
LED Output Current Feedback Pin
Control Loop Compensation Pin
Not Connected
IC Input Voltage, Adding from Boost Output Voltage
Supply Voltage For Internal Circuit
Not Connected
Connected to Ground
AL8821
Functional Block Diagram
VIN
6
Internal VCC
Regulator VREF
Bandgap VBG
VBG UVLO Chip_EN
VIN
VFB OVP
OVP
VCC
7
LOGIC
PWM1
9
Exposed
Pad
2
CS
CS1
VCS1
3
FB
VBG EA
4
COMP
AL8821
Document number: DS37671 Rev. 1 - 2
COMPARATOR
PWM1
OTP
VCC
Driver
1
SW
2 of 14
www.diodes.com
January 2015
© Diodes Incorporated



Part Number AL8821
Description 2A BOOST LED DRIVER
Maker Diodes - Diodes
Total Page 14 Pages
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