16串LED驱动器设计指南详解

MSL2164和MSL2166器件以高电流精度和LED串匹配来驱动外部MOSFET， 这些器件具有爱特梅尔LED驱动器产品系列中最宽的调光分辨率，能够提高对比度，与其它解决方案相比，功耗降低至少20%。
　　过去，TV OEM厂商必须计算合适的参数，以便有效地照亮所要求的显示屏背光区域。LED驱动器将生成算法以设置合适的LED串相位，优化背光与LCD面板的同步。 OEM厂商必须经常执行附加算法以调节LED串相位，确保背光在帧刷新期间完全同步。MSL2164和MSL2166具有多种脉宽调制（PWM）模式， 包括正向、逆向、拖尾和中心，由于新器件中集成了定时算法，设计复杂性得以降低，这确保背光在所有LCD像素已经稳定的最佳时刻照亮。
　　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引脚图：
　　
　　MSL2164功能框图：
　　
　　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.