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基于SC442设计的高效120个白光LED驱动技术

发布时间:2020-06-30 19:50:22 阅读: 来源:电脑票据厂家

SC442是10路高效120个白光LED驱动器,输入电压4.5V-21V,高效的升压转换器可使输出电压高达42V,非常适合中到大型LCD显示屏。电流沉可编程,每路高达30mA,路间的电流匹配在+/-1%,集成了3A开关,效率高达91%,可灵活进行LED配置,高达50kHz调光频率,大于500:1调光范围,开关频率500kHz - 1MHz,主要用在汽车LCD背光,台式监视器,笔记本电脑和手提TV。SC442主要特性:Wide input voltage range from 4.5V to 21V42V maximum operating output voltageProgrammable LED current up to 30mA per string+/- 1% current matchingIntegrated 3A switchLow current sink voltageUp to 91% efficiencyFlexible LED configurations Mismatched LED channels Disable individual channel(s) Parallel channels for high LED current PWM dimming capability Up to 50kHz dimming frequency >500:1 dimming rangeSwitching frequency: 500kHz - 1MHzParallel device operation with Sync PinProtection features: Adjustable OVP Cycle-by-cycle current limit LED short channel with disable /Open channnel Over-Temperature protectionMLPQ-28 lead-free package (WEEE and RoHS compliant), 4×4mm × 0.6mmSC442应用:Automotive LCD Backlighting Desktop monitors Notebook PCs Portable TVs

本文引用地址:图1。SC442典型应用电路

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