MSL2164:16串LED驱动器应用案例精讲

作者：时间：2013-09-09 来源：网络收藏

MSL2164和 MSL2166器件可在新型3D和2D滚动背光TV中提供极具吸引力的观看和视频游戏体验。

这些 LED驱动器可与爱特梅尔tinyAVR®、megaAVR®和AVR XMEGA等AVR®微控制器(MCU) 无缝集成。微控制器处理定时和调光指令，将数据发送给 MSL2164和 MSL2166器件。 AVR器件与固件提供优化整个背光设计的总体解决方案，提供相比竞争解决方案更卓越的性能。

MSL2164和 MSL2166器件具有最高效的功率管理、背光控制，以及用于3D、扫描和区域调光侧光LCD TV的多重调光模式，可以驱动多达16个并联LED串，提供全面的系统和故障管理，以支持高性能背光设计。采用这一新驱动器系列，高端电视OEM厂商能够使用改善背光定时精度的内部照明定时算法，提供高于现今市场上其它解决方案的分辨率，以实现高屏幕分辨率，并大幅提升图像质量。同时，OEM厂商能够选择外形尺寸更小的MCU如tinyAVR器件，来降低系统开销。

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。

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The MSL2164/MSL2166 compact, high-power LED string drivers use external current controlMOSFETsto sink up to 350mA per string, with matching better than ±0.8%. The MSL2164/MSL2166 drive 16 parallel strings of LEDs and offer fault detection and management of open-circuit and short-circuit LEDs.

The MSL2164/MSL2166 feature a 20MHz SPI serial interface. Both devices support video frame-by-frame LED string intensity control for up to eightinterconnected devices, allowing active area dimming and phase-shiftedPWMoutputs. They also include an advancedPWMengine that synchronizes PWM dimming to the video signal supporting forward, center, reverse and inverse PWM modes for reduced motion blur and waterfall noise.

The MSL2164/MSL2166 adaptively control any topology DC-DC or AC/DC converter that power the LED strings. The patent-pending “Efficiency Optimizers” minimize power use while maintaining LED current accuracy.

A unique combination of LED current control and pulse width dimming management offers simple full-screen brightness control, versatile area dimming and a consistent white point. Full-scale LED regulation current is set for each string using current sense resistors and a 10-bit register that controls global string current. The 12-bit global intensity register controls PWM dimming of all strings, and each string uses a 12-bit register to control individual string PWM

dimming.

The MSL2164/MSL2166 monitor the LED strings for open-circuit, short-circuit, loss-of-sync and over-temperature faults, and provide a hardware fault output (FLTB) to notify the microcontroller. Detailed fault status and control are available through the serial interface. Additionally, the MSL2164/MSL2166 include on-chip EEPROMs that allow customizing of the register power-up states via the serial interface.

The MSL2164/MSL2166 are offered in a 9 x 9 x 0.85mm, 64-pin TQFN package and operate over the -40°C to 85°C temperature range.