NS LM3492两路单独调光LED驱动方案
NS公司的LM3492是两路单独调光LED驱动器,集成了升压转换器和快速电流稳压器.可编程开关频率从200 kHz到1 MHz,输入电压4.5V-65V,可编程LED电流从50 mA 到 200 mA,调光电压达65V,总功率可达15W,主要应用在超高对比度6.5”-10”难关LCD显示屏背光以及汽车或航海GPS显示器.本文介绍了LM3492主要特性, 简化功能方框图, 典型应用电路图以及LM3492评估板参考设计电路图和评估板材料清单(BOM),PCB元件布局图.
LM3492: Two-Channel Individual Dimmable LED Driver with Boost Converter and Fast Current Regulator
The LM3492 integrates a boost converter and a two-channel current regulator to implement a high efficient and cost effective LED driver for driving two individually dimmable LED strings with a maximum power of 15W and an output voltage of up to 65V. The boost converter employs a proprietary Projected- On-Time control method to give a fast transient response with no compensation required, and a nearly constant switching frequency programmable from 200 kHz to 1 MHz.
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