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Diodes Semiconductor Electronic Components Datasheet

AL8821 Datasheet

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



Diodes Semiconductor Electronic Components Datasheet

AL8821 Datasheet

2A BOOST LED DRIVER

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



Diodes Semiconductor Electronic Components Datasheet

AL8821 Datasheet

2A BOOST LED DRIVER

No Preview Available !

AL8821 pdf
AL8821
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified. Note 4)
Symbol
VIN
VSW
VCOMP
VCS
VFB
VCC
TJ
TSTG
θJA
TLEAD
Parameter
VIN Pin Voltage
SW Pin Voltage
COMP Pin Voltage
CS Pin Voltage
FB Pin Voltage
VCC Pin Voltage
Operating Junction Temperature
Storage Temperature
Thermal Resistance (Junction to Ambient) (Note 5)
Lead Temperature (Soldering, 10sec)
ESD (Machine Model)
ESD (Human Body Model)
Rating
-0.3 to 40
-0.3 to 40
-0.3 to 6
-0.3 to 6
-0.3 to 6
-0.3 to 6
+150
-65 to +150
66
+300
200
2000
Unit
V
V
V
V
V
V
ºC
ºC
°C/W
ºC
V
V
Notes:
4. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
5. Device mounted on FR-4 PCB (51mm x 51mm) 2oz copper, minimum recommended pad layout on top layer and thermal vias to bottom layer ground
plane. For better thermal performance, larger copper pad for heat-sink is needed.
Recommended Operating Conditions
Symbol
VIN
TA
Parameter
VIN Pin Voltage
Ambient Temperature
Min Max Unit
5 36 V
-40
+105
°C
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol
Input Supply
VIN
IQ
VUVLO
VHYS
VCC Regulator
VCC
Parameters
VIN Pin Voltage
Quiescent Current
Under-Voltage Lockout
Voltage
UVLO Hysteresis
Conditions
No Switching
VIN Rising
VCC Pin Voltage
Source Current Capability
Load Regulation
VCC = 5V
AL8821
Document number: DS37671 Rev. 1 - 2
3 of 14
www.diodes.com
Min Typ Max
5 36
1
4.2
500
Unit
V
mA
V
mV
4.5 5 5.5
10 – –
4
V
mA
%
January 2015
© Diodes Incorporated




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