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Diodes Semiconductor Electronic Components Datasheet

AL8820 Datasheet

2A BOOST/BUCK LED DRIVER

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AL8820 pdf
AL8820
40V, 2A BOOST/BUCK LED DRIVER
Description
Pin Assignments
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
sense resistor. The integrated low RDSON of integrated MOSFETs
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 Antimony Free. “Green” Device (Note 3)
(Top View)
SW1 1
CS1 2
FB 3
COMP 4
EP
SO-8EP
Applications
MR16 Lamps
AR111
General Illumination Lamps
8 SW2
7 VCC
6 VIN
5 CS2
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
L1
L2
Vac D1 D2
D5 RSET2
D3 D4
R1
C1 C2 D6
C5
VOUT
R2
RSET1
RHYS
SW1
CS1
FB
SW2
VCC
VIN
C3
L3
COMP CS2
C4 (Exposed Pad)
AL8820
Document number: DS37369 Rev. 1 - 2
1 of 15
www.diodes.com
December 2014
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL8820 Datasheet

2A BOOST/BUCK LED DRIVER

No Preview Available !

AL8820 pdf
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
Pin Name
SW1
CS1
FB
COMP
CS2
VIN
VCC
SW2
Exposed Pad
Function
Integrated Boost MOS Drain
Boost Input Current Sense Pin
Boost Output Voltage Feedback Pin
Soft-start and Boost Control Loop Compensation
Buck Output Current Sense Pin
IC Input Voltage, Adding from Boost Output Voltage
Supply Voltage For Internal Circuit
Integrated Buck MOS Drain
Connected To Ground
AL8820
Functional Block Diagram
VIN
6
CS2
5
VCC
7
Internal VCC
Regulator VREF
CS2
ICS Trimming VCS2
Resistor
Bandgap VBG
VBG UVLO Chip_EN
HYSTERESIS
COMPARATOR
VCC
VREF
Driver
VIN
VFB OVP
OVP
LOGIC
CTL
PWM1
8
SW2
9
GND
2
CS1
CS1
VCS1
3
FB
VBG EA
4
COMP
AL8820
Document number: DS37369 Rev. 1 - 2
COMPARATOR
PWM1
OTP
VCC
Driver
1
SW1
2 of 15
www.diodes.com
December 2014
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL8820 Datasheet

2A BOOST/BUCK LED DRIVER

No Preview Available !

AL8820 pdf
AL8820
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified. Note 4)
Parameter
VIN Pin Voltage
SW1 Pin Voltage
SW2 Pin Voltage
COMP Pin Voltage
CS1 Pin Voltage
CS2 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)
Symbol
VIN
VSW1
VSW2
VCOMP
VCS1
VCS2
VFB
VCC
TJ
TSTG
θJA
TLEAD
Value
-0.3 to 40
-0.3 to 40
-0.3 to 40
-0.3 to 6
-0.3 to 6
-0.3 to 40
-0.3 to 6
-0.3 to 6
+150
-65 to +150
66
+300
200
2000
Unit
V
V
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
AL8820
Document number: DS37369 Rev. 1 - 2
3 of 15
www.diodes.com
December 2014
© Diodes Incorporated




Part Number AL8820
Description 2A BOOST/BUCK LED DRIVER
Maker Diodes
Total Page 15 Pages
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