Marvell 公司的88EM8183是深調(diào)單級(jí)AC/DC LED驅(qū)動(dòng)器,采用混合信號(hào)架構(gòu)和信號(hào)處理技術(shù),具有業(yè)界最高的調(diào)光范圍,提供全范圍調(diào)光和可吊光到1%.,效率高達(dá)90%,功率因速大于0.95,THD小于20%,同類產(chǎn)品中元件數(shù)最少,目標(biāo)應(yīng)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(yōu)勢(shì),典型應(yīng)用電路以及220VAC單級(jí)反激(A19)TRIAC調(diào)光LED驅(qū)動(dòng)器開發(fā)板主要特性和電路圖.

Marvell公司的Marvell88EM8183，是深調(diào)光單級(jí)AC/DC LED驅(qū)動(dòng)器集成電路，可用于離線可調(diào)光LED照明。通過(guò)Marvell的創(chuàng)新混合信號(hào)架構(gòu)和信號(hào)處理技術(shù)，88EM8183可以提供全范圍調(diào)光，可編程深調(diào)光可達(dá)1％，并具有最高的兼容性，兼容所有類型的斷相調(diào)光器，包括，先進(jìn)的（TRIAC），和后緣及特殊（SMART）調(diào)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(chǎng)上其他可調(diào)光LED驅(qū)動(dòng)器，可用于絕大多數(shù)外形的，照明燈和燈具的OEM和ODM的照明。

88EM8183采用了準(zhǔn)諧振控制（QRC）和谷開關(guān)的方法，功率因數(shù)校正（PFC）最高為90％，功率因數(shù)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(guò)能源之星，和其他法規(guī)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(shè)計(jì)上的難度，提高了運(yùn)營(yíng)效率（采用產(chǎn)品平臺(tái)的方法），從而降低了LED燈和燈具SKU數(shù)量，并簡(jiǎn)化了庫(kù)存管理。
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圖1 88EM8183典型應(yīng)用電路

88EM8183主要特性

?較高的行業(yè)調(diào)光器兼容性

–兼容絕大多數(shù)的墻框調(diào)光器

–完全符合NEMA的SSL6調(diào)光標(biāo)準(zhǔn)

?較佳的調(diào)光性能

–白熾燈般的調(diào)光：下至1％深度調(diào)光，無(wú)頻閃無(wú)微光

?效率高達(dá)90％

?功率因數(shù)>0.95

?低總諧波失真<20％

?較低的元件數(shù)量

–無(wú)需光耦和次級(jí)反饋電路

–無(wú)需啟動(dòng)電源電路

–無(wú)需調(diào)光器分壓電路

?在同級(jí)中較小的驅(qū)動(dòng)器PCB空間，適合大部分更換燈泡的尺寸

88EM8183應(yīng)用

?翻新A19，GU -10，PAR和BR燈

?向下筒燈，嵌壁式凹進(jìn)燈，troffer和面板燈

? LED模塊

單級(jí)反激(A19)TRIAC調(diào)光LED驅(qū)動(dòng)器開發(fā)板

Marvell單級(jí)反激式（A19）可控硅調(diào)光LED驅(qū)動(dòng)器評(píng)估板，用于評(píng)估Marvell88EM8183的性能。Marvell88EM8183是一個(gè)深度調(diào)光的單級(jí)AC/DC恒流控制器，用于更換離線LED燈和燈具。該評(píng)估套件包括，一個(gè)A19燈與一個(gè)Marvell的88EM8183驅(qū)動(dòng)板，用于更換130V/300mA LED負(fù)載的60W燈泡，附加驅(qū)動(dòng)板、快速入門指南、用戶手冊(cè)、設(shè)計(jì)文件、變壓器規(guī)格和測(cè)試報(bào)告開發(fā)。由于這個(gè)設(shè)計(jì)面向全球LED市場(chǎng)，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(píng)估板的A19燈可以用來(lái)快速核實(shí)驅(qū)動(dòng)器的調(diào)光器兼容層次。該LED驅(qū)動(dòng)板還可以進(jìn)行進(jìn)一步的性能和評(píng)估測(cè)試，為產(chǎn)品開發(fā)提供基礎(chǔ)。

該評(píng)估板基于88EM8183 LED驅(qū)動(dòng)器，它是一個(gè)深調(diào)光的單級(jí)AC/DC恒流控制器，用于離線可調(diào)光LED照明應(yīng)用的設(shè)計(jì)。通過(guò)Marvell的創(chuàng)新混合信號(hào)架構(gòu)和信號(hào)處理技術(shù)，88EM8183提供了1％的深度調(diào)光，具有廣泛的（可控硅）調(diào)光器的兼容性。

初級(jí)側(cè)的控制拓?fù)錈o(wú)需使用光耦合器，及任何其他相關(guān)的次級(jí)反饋電路，從而提高了系統(tǒng)的可靠性。通過(guò)嵌入式數(shù)字核，以及模擬電路來(lái)管理調(diào)光器的負(fù)載需求，從而無(wú)需使用外部泄放電路。此外，88EM8183集成了一個(gè)高壓啟動(dòng)電源電路，從而，消除了外部啟動(dòng)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(shù)量的急劇減少，使得PCB的尺寸縮小，以應(yīng)對(duì)成本和空間的挑戰(zhàn)，更適用于改進(jìn)LED照明。
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圖2 220VAC10W反激TRIAC調(diào)光LED驅(qū)動(dòng)器評(píng)估板電路圖

評(píng)估板文件包括：

? Marvell的設(shè)計(jì)文件

?示意圖

?格柏/布局文件

?物料清單（BOM）

?變壓器規(guī)格

?測(cè)試報(bào)告

?調(diào)光曲線

? EMI/EMC

?性能數(shù)據(jù)

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(yōu)勢(shì):

? 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(biāo)應(yīng)用:

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

Downlight, recess, troffer and panel lights

LED modules

圖1.88EM8183典型應(yīng)用電路

單級(jí)反激(A19)TRIAC調(diào)光LED驅(qū)動(dòng)器開發(fā)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(diào)光LED驅(qū)動(dòng)器開發(fā)板主要特性:

圖2.TRIAC調(diào)光LED驅(qū)動(dòng)器評(píng)估板外形圖

圖2.220VAC10W反激TRIAC調(diào)光LED驅(qū)動(dòng)器評(píng)估板電路圖