16串LED驅(qū)動(dòng)器設(shè)計(jì)指南詳解

MSL2164和MSL2166器件以高電流精度和LED串匹配來驅(qū)動(dòng)外部MOSFET， 這些器件具有愛特梅爾LED驅(qū)動(dòng)器產(chǎn)品系列中最寬的調(diào)光分辨率，能夠提高對(duì)比度，與其它解決方案相比，功耗降低至少20%。
　　過去，TV OEM廠商必須計(jì)算合適的參數(shù)，以便有效地照亮所要求的顯示屏背光區(qū)域。LED驅(qū)動(dòng)器將生成算法以設(shè)置合適的LED串相位，優(yōu)化背光與LCD面板的同步。 OEM廠商必須經(jīng)常執(zhí)行附加算法以調(diào)節(jié)LED串相位，確保背光在幀刷新期間完全同步。MSL2164和MSL2166具有多種脈寬調(diào)制（PWM）模式， 包括正向、逆向、拖尾和中心，由于新器件中集成了定時(shí)算法，設(shè)計(jì)復(fù)雜性得以降低，這確保背光在所有LCD像素已經(jīng)穩(wěn)定的最佳時(shí)刻照亮。
　　The MSL2164 and MSL2166 are highly integrated， flexible，16-string LED drivers that use external MOSFETs to allowhigh LED string currents and/or voltage. They include powersupply control to maximize efficiency and an advancedPWM dimming control circuit for regional dimming and 3DLED backlights. The drivers optionally connect to a videosubsystem to offer a simple architecture for use in LCD TVbacklight applications. Up to eight devices easily connecttogether to drive large numbers of LED strings in a system.
　　MSL2164引腳圖：
　　
　　MSL2164功能框圖：
　　
　　The drivers provide multiple methods of controlling LEDbrightness， through both LED regulation current control andthrough PWM dimming. Set the LED current to control colorand use pulse width control for brightness management andmotion blur reduction. An on-chip EEPROM stores all thedefault control register values， which are applied at start-upand reconfigured through the serial data interface.