基于SC442设计的高效120个白光LED驱动技术
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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 21V
42V maximum operating output voltage
Programmable LED current up to 30mA per string
+/- 1% current matching
Integrated 3A switch
Low current sink voltage
Up to 91% efficiency
Flexible 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 range
Switching frequency: 500kHz - 1MHz
Parallel device operation with Sync Pin
Protection features:
Adjustable OVP
Cycle-by-cycle current limit
LED short channel with disable /Open channnel
Over-Temperature protection
MLPQ-28 lead-free package (WEEE and RoHS compliant), 4×4mm × 0.6mm
SC442应用：
Automotive LCD Backlighting
Desktop monitors
Notebook PCs
Portable TVs
图1。SC442典型应用电路
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