Marvell 公司的88EM8183是深調單級AC/DC LED驅動器,采用混合信號架構和信號處理技術,具有業界最高的調光范圍,提供全范圍調光和可吊光到1%.,效率高達90%,功率因速大于0.95,THD小于20%,同類產品中元件數最少,目標應用在A19,GU-10,PAR和BR燈,以及LED模塊,聚光燈等.本文介紹了88EM8183優勢,典型應用電路以及220VAC單級反激(A19)TRIAC調光LED驅動器開發板主要特性和電路圖.

Marvell公司的Marvell88EM8183，是深調光單級AC/DC LED驅動器集成電路，可用于離線可調光LED照明。通過Marvell的創新混合信號架構和信號處理技術，88EM8183可以提供全范圍調光，可編程深調光可達1％，并具有最高的兼容性，兼容所有類型的斷相調光器，包括，先進的（TRIAC），和后緣及特殊（SMART）調光器。它也顯著降低了外部元件使用量，因此，使用電路板的空間要小于市場上其他可調光LED驅動器，可用于絕大多數外形的，照明燈和燈具的OEM和ODM的照明。

88EM8183采用了準諧振控制（QRC）和谷開關的方法，功率因數校正（PFC）最高為90％，功率因數0.95以上及低于20％的總諧波失真，使得OEM和ODM照明輕松超過能源之星，和其他法規的要求。

此外，88EM8183 IC支持通用AC輸入，和廣泛的LED輸出功率（幾瓦到100W）。這種特性使得OEM和ODM照明大幅降低了設計上的難度，提高了運營效率（采用產品平臺的方法），從而降低了LED燈和燈具SKU數量，并簡化了庫存管理。
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圖1 88EM8183典型應用電路

88EM8183主要特性

?較高的行業調光器兼容性

–兼容絕大多數的墻框調光器

–完全符合NEMA的SSL6調光標準

?較佳的調光性能

–白熾燈般的調光：下至1％深度調光，無頻閃無微光

?效率高達90％

?功率因數>0.95

?低總諧波失真<20％

?較低的元件數量

–無需光耦和次級反饋電路

–無需啟動電源電路

–無需調光器分壓電路

?在同級中較小的驅動器PCB空間，適合大部分更換燈泡的尺寸

88EM8183應用

?翻新A19，GU -10，PAR和BR燈

?向下筒燈，嵌壁式凹進燈，troffer和面板燈

? LED模塊

單級反激(A19)TRIAC調光LED驅動器開發板

Marvell單級反激式（A19）可控硅調光LED驅動器評估板，用于評估Marvell88EM8183的性能。Marvell88EM8183是一個深度調光的單級AC/DC恒流控制器，用于更換離線LED燈和燈具。該評估套件包括，一個A19燈與一個Marvell的88EM8183驅動板，用于更換130V/300mA LED負載的60W燈泡，附加驅動板、快速入門指南、用戶手冊、設計文件、變壓器規格和測試報告開發。由于這個設計面向全球LED市場，它即可以用于高電壓220VAC輸入，也可以用于低電壓110VAC輸入。

該評估板的A19燈可以用來快速核實驅動器的調光器兼容層次。該LED驅動板還可以進行進一步的性能和評估測試，為產品開發提供基礎。

該評估板基于88EM8183 LED驅動器，它是一個深調光的單級AC/DC恒流控制器，用于離線可調光LED照明應用的設計。通過Marvell的創新混合信號架構和信號處理技術，88EM8183提供了1％的深度調光，具有廣泛的（可控硅）調光器的兼容性。

初級側的控制拓撲無需使用光耦合器，及任何其他相關的次級反饋電路，從而提高了系統的可靠性。通過嵌入式數字核，以及模擬電路來管理調光器的負載需求，從而無需使用外部泄放電路。此外，88EM8183集成了一個高壓啟動電源電路，從而，消除了外部啟動電路的使用。憑借其高集成度，88EM8183顯著減少了所需的外部元件。元件數量的急劇減少，使得PCB的尺寸縮小，以應對成本和空間的挑戰，更適用于改進LED照明。
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圖2 220VAC10W反激TRIAC調光LED驅動器評估板電路圖

評估板文件包括：

? Marvell的設計文件

?示意圖

?格柏/布局文件

?物料清單（BOM）

?變壓器規格

?測試報告

?調光曲線

? EMI/EMC

?性能數據

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優勢:

? 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目標應用:

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

Downlight, recess, troffer and panel lights

LED modules

圖1.88EM8183典型應用電路

單級反激(A19)TRIAC調光LED驅動器開發板

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調光LED驅動器開發板主要特性:

圖2.TRIAC調光LED驅動器評估板外形圖

圖2.220VAC10W反激TRIAC調光LED驅動器評估板電路圖