代理产线

SC445

 2016-07-13

【基本数据】

【产品特性】

Input voltage — 4.75V to 27V
Output voltage—up to 42V
Drives up to 40 WLEDs in 4 strings
Programmable LED current for up to 150mA per string
+/- 2% string-to-string current matching
Up to 90% efficiency
Wide 0.2% to 100% PWM dimming range
Enable analog dimming
Integrated 3.0A power switch
700KHz switching frequency for small size
Adjustable OVP for cost-effective output cap selection
Open/short LED protection
Short LED protection enable/disable
Thermal protection with auto-recovery
Thermally enhanced TSSOP-20 EDP package

Drives up to 40 WLEDs in 4 strings
Programmable LED current for up to 150mA per string
+/- 2% string-to-string current matching
Up to 90% efficiency
Wide 0.2% to 100% PWM dimming range
Enable analog dimming
Integrated 3.0A power switch
700KHz switching frequency for small size
Adjustable OVP for cost-effective output cap selection
Open/short LED protection
Short LED protection enable/disable
Thermal protection with auto-recovery

【产品应用】

Medium-sized LCD panel
Notebook Display
Automotive Car Navigation Display
Sub-Notebook and Tablet Computer Displays
Portable Media Players

【文字介绍】

SC445是一个高效率的多串WLED驱动器,具有集成升压转换器。它工作在宽输入电压范围为4.5V至27V,并可以保持快速的瞬态输入电压高达5V /μs的。它可以驱动多达40个WLED4串电流高达每串150毫安。该stringto串电流匹配度为2%。
整体效率大于90%的电流检测电压和一个低阻抗的内部电源开关。宽PWM调光范围500:1。
在700kHz的开关频率允许用户优化外部组件尺寸以提高效率。当每串不到10个LED,用户可以调整输出电压保护和电压额定值输出电容器以减少的相关成本。
SC445还提供全面的开路和短路LED保护功能。可关闭LED开路或短路LED串的条件同时保持其他的正常操作中,未受影响的LED串。此功能可让液晶面板保持可见即使在LED故障,电线断路或短路条件。内部热关断保护在IC从在异常情况过热。