原标题：Marvell 88EM8183 10W反激TRIAC调光LED驱动方案

　　Marvell 公司的88EM8183是深调单级AC/DC LED驱动器,采用混合信号架构和信号处理技术,具有业界最高的调光范围,提供全范围调光和可吊光到1%.,效率高达90%,功率因速大于 0.95,THD小于20%,同类产品中元件数最少,目标应用在A19,GU-10,PAR和BR灯,以及LED模块,聚光灯等.本文介绍了 88EM8183优势,典型应用电路以及220VAC单级反激(A19)TRIAC调光LED驱动器开发板主要特性和电路图.

　　The Marvell 88EM8183 deep dimming single stage AC/DC LED driver integrated circuit (IC) is designed for offline dimmable LED lighting applications. Through Marvell’s innovative mixed-signal architecture and signal processing technology, 88EM8183 delivers full range dimming with programmable deep dimming down to 1% and the highest compatibility with all types of phase-cut dimmers including leading-edge (TRIAC), trailing-edge and special (smart) dimmers worldwide, It also significantly reduces external components hence needs less board space than other dimmable LED drivers on the market allowing lighting OEMs and ODMs to bring LED lighting to most of lamp and fixture form factors.

　　88EM8183 deploys the Quasi Resonant Control (QRC) and valley switching methods with Power Factor Correction (PFC) delivering up to 90 percent efficiency, power factor above 0.95 and lower than 20 percent total harmonics distortion, enabling lighting OEMs and ODMs to easily exceed ENERGY STAR and other regulation requirements.

　　Moreover, the 88EM8183 IC supports universal AC input and a wide range of LED output wattages from a few watts up to 100 watts. This capability allows lighting OEMs and ODMs to dramatically reduce design efforts and improve operational efficiency by taking a product platform approach, which decreases the number of LED lamp and fixture SKUs and streamlines inventory management.

　　88EM8183优势:

　　• Highest dimmer compatibility in industry

　　- Compatible with vast majority of wall box dimmers

　　- Fully comply with NEMA SSL 6 dimming standard

　　• Best dimming performance

　　- Incandescent-like dimming experience: down to 1% deep dimming, no flicker, no shimmer

　　• High efficiency - up to 90%

　　• High power factor - > 0.95

　　• Low THD - <20%

　　• Lowest component count in its class

　　- Eliminates opto-coupler and secondary feedback circuit

　　- Eliminates startup power supply circuit

　　- Eliminates dimmer bleeder circuit

　　• Smallest driver PCB space in its class

　　Fits in majority of replacement bulb form factors

　　88EM8183目标应用:

　　Retrofit A19, GU-10, PAR, and BR lamps

　　Downlight, recess, troffer and panel lights

　　LED modules

　　图1.88EM8183典型应用电路

　　单级反激(A19)TRIAC调光LED驱动器开发板

　　This Marvell® single-stage Flyback (A19) TRIAC-Dimmable LED driver evaluation kit has been developed for evaluating the performance of the Marvell 88EM8183, a deep dimming, single-stage AC/DC constant current controller for replacement of offline LED lamps and luminaires. The evaluation kit includes an A19 lamp with a Marvell 88EM8183 driver board developed for a 60W replacement lamp with a 30V/300mA LED load, an additional driver board, Quick Start Guide, User Manual, design files, transformer specification and test reports. As this design targets the global LED market, it can be ordered as either a high-voltage 220VAC input version or as a low-voltage 110VAC input version.

　　The evaluation kit’s A19 lamp can be used to quickly verify the driver’s high level of dimmer compatibility. Further performance and evaluation tests can be conducted on the LED driver board, which can also provide the basis for product development.

　　The evaluation kit is based on the 88EM8183 LED driver, a deep dimming single-stage AC/DC constant current controller, designed for offline dimmable LED lighting applications. Through Marvell’s innovative mixed-signal architecture and signal processing technology, 88EM8183 delivers down to 1% deep dimming and the highest compatibility with a wide range of wall box (TRIAC) dimmers.

　　The primary side control topology eliminates the need to use opto-couplers and any other associated secondary feedback circuit, thus improving system reliability. The embedded digital core and analog circuit manages dimmer load requirements and thereby eliminates the need to use external bleeder circuits. In addition, 88EM8183 integrates a high voltage start up power supply circuit, hence eliminates the usage of external start up circuits. With its high level of integration, the 88EM8183 significantly reduces the external components required for a dimmable LED driver to 50% fewer than competitive solutions. This dramatic reduction in component count produces a small form-factor PCB enabling LED lighting adoption in cost and space challenged applications such as retrofit lamps.

　　Evaluation kit files include:

　　Marvell Design Files

　　• Schematic

　　• Gerber/Layout files

　　• Bill of materials (BOM)

　　• Transformer specification

　　Test Reports

　　• Dimming Curve

　　• EMI/EMC

　　• Performance data

　　TRIAC调光LED驱动器开发板主要特性:

　　图2.TRIAC调光LED驱动器评估板外形图

　　图2.220VAC10W反激TRIAC调光LED驱动器评估板电路图