MSL2164:16串LED驅(qū)動(dòng)器應(yīng)用案例精講
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The MSL2164/MSL2166 compact, high-power LED string drivers use external current control MOSFETs to 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-shifted PWM outputs. They also include an advanced PWM engine 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.
典型應(yīng)用電路
應(yīng)用：
Long-Life, Efficient LED Backlighting for:
- Televisions and Desktop Monitors
- Medical and Industrial Instrumentation
- Automotive Audio-visual Displays Channel Signs Architectural Lighting
相關(guān)閱讀：
最實(shí)用的LED驅(qū)動(dòng)設(shè)計(jì)的18個(gè)經(jīng)典案例分析，原理，電路，方案，驗(yàn)證，一網(wǎng)打盡
推薦閱讀：
1.MSL2164:16串LED驅(qū)動(dòng)器設(shè)計(jì)指南詳解（獨(dú)家）
摘 要：過(guò)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。
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