Linear LTM8042 uModule LED串驱动方案
Linear公司的LTM8042和LTM8042-1 是uModule LED串驱动器,工作电压从3V到30V,具有40VIN瞬态保护,工作模式有升压,降压或降-升压模式,调光比3000:1,可调工作频率从250kHz到 2.5MHz,主要用在显示器背光,汽车和飞机照明,照明和扫描仪.本文介绍了LTM8042和LTM8042-1主要特性,方框图以及多种应用电路.
LTM8042 and LTM8042-1: uModule LED String Drivers with 40VIN Transient Protection
The LTMR8042 is a complete μModuleR Boost LED Driver specifically designed to drive LEDs up to 1A, while the LTM8042-1 drives up to 350mA. It combines a boost power topology with a unique current loop to operate as a constant-current source. The PWM input provides as much as 3000:1 LED dimming, while 10:1 analog dimming can be accomplished by a single resistor or analog voltage applied to the CTL pin. As with any boost topology, the LTM8042/LTM8042-1 has an uninterrupted current path between its input and output and is thus intolerant to a short-circuit or overload from the output to ground.
The LTM8042/LTM8042-1 is packaged in a thermally enhanced, compact overmolded land grid array (LGA) package. The LTM8042/LTM8042-1 is Pb-free and a RoHS compliant.
LTM8042和LTM8042-1主要特性:
True Color PWM™ with 3000:1 Dimming Ratio
Operates in Boost, Buck Mode or Buck-Boost Mode
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