[原创] Linear LT3952 60V 4A LED驱动方案

Linear公司的LT3952是集成了60V 80mΩ DMOS功率开关的电流模式降压DC/DC转换器,4000:1真色彩PWM调光,10:1模拟调光,输入电压3V-42V,输出电压0-60V,主要用在显示器背光,汽车和航空照明,精密限流电压稳压器.本文介绍了LT3952主要特性,框图和几种应用电路,以及演示板DC2013A主要特性,电路图,材料清单和PCB元件布局图.

The LT®3952 is a current mode step-up DC/DC converterwith an internal, 60V, 80mΩ DMOS power switch. TheLT3952 is specifically designed to drive high power LEDsin multiple configurations. It combines input and outputcurrent regulation loops with output voltage regulation tooperate as a flexible current/voltage source.

Programmable switching frequency with optional spreadspectrummodulation provides EMI reduction, while stillallowing optimization of the external components forefficiency or component size. The LED current is programmablewith an external sense resistor, and can be adjustedfrom zero to full scale with a voltage at the CTRL pin. Theexternal PWM input provides LED ON/OFF control and4000:1 dimming ratio, and an internal PWM generatordelivers the efficiency of PWM dimming to standaloneor I/O limited applications. The LT3952 is available in thethermally enhanced 28-lead TSSOP package.

LT3952主要特性:

4000:1 True Color PWM™ Dimming..

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