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 sense resistor. The integrated low RDSON of integrated MOSFETs reduce the conduction power loss. A compact thermally efficient SO8EP package, the AL8820 provides an ideal solution for MR16/AR111 applications. Pin Assignments
(Top View)
SW1 CS1 FB COMP 8 7 6 5 SW2 VCC VIN CS2 1 2 3 4 EP NEW PRODUCT SO-8EP Applications MR16 Lamps AR111 General Illumination Lamps 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) 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 D3 D1 D2 D5 D4 R1 C1 R2 L3 SW1 SW2 C2 D6 C5 VOUT RSET2 RSET1 RHYS AL8820 CS1 FB VCC C3 VIN CS2 COMP C4 (Exposed Pad) AL8820
Document number: DS37369 Rev. 1 - 2 1 of 15 www.diodes.com December 2014
© Diodes Incorporated AL8820 Pin Descriptions
Pin Number 1 2 3 Pin Name SW1 CS1 FB COMP CS2 VIN VCC SW2 Exposed Pad 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 Integr …
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