[bwin中国可以用吗? ] STLED5000 850kHz固定开关频率3A LED驱动方案

ST公司的LED5000是850kHz固定开关频率单片降压DC/DC转换控制器,驱动电流可高达3A,PWM LED亮度调光,输入电压5.5V-48V,± 3%输出电流精度,主要用于高亮度LED驱动,街灯照明,信号标志牌和通用照明.本文介绍了LED5000主要特性,功能框图,几种典型应用电路,以及3A降压LED驱动器STEVAL-ILL056V1主要特性和电路图.

The LED5000 device is an 850 kHz fixedswitching frequency monolithic step-down DC-DC converter designed to operate as a preciseconstant current source with an adjustable current capability up to 3 A DC. The embedded PWMdimming circuitry features LED brightness control. The regulated output current level is set byconnecting a sensing resistor to the feedback pin.

The 200 mV typical RSENSE voltage dropenhances performance in terms of efficiency. Thesize of the overall application is minimized thanksto the high switching frequency and itscompatibility with ceramic output capacitors. Thedevice is fully protected against overheating,overcurrent and output short-circuit. TheLED5000 is available in an HSOP8 package.

LED5000主要特性:
 5.5 V to 48 V operating input voltage range
 850 kHz fixed switching frequency
 200 mV typ. current sense voltage drop
 Buck / buck-boost / floating boost topologies
 PWM dimming..

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