3W升压恒流LED驱动器3W HIGH POWER WHITE LED DRIVER CXLE8291是采用PWM控制模式开关型DC-DC升压恒流驱动，用于驱动3W大功率白光LED。LED电流可通过外部反馈电阻调节500mA~1A输出，95mV的反馈电压可以有效减少外部电阻的损耗。固定1MHZ开关频率。使用较小的电感和陶介电容输入电压1.8－3.6V,LED电流可通过外部电阻设定 .

   产品概述 返回TOPhUw嘉泰姆

      The CXLE8291 is a set-up DC-DC converter that delivers a regulated output current. The device switches at a 1.0MHz constant frequency,allowing for the use of small value external inductor and ceramic capacitors.The CXLE8291 is targeted to be used for driving loads up to 1A from a two-cell alkaline battery. The LED current can be programmed by the external current sense resistor, RS, connected between the feedback pin (FB) and ground. A low 95mV feedback voltage reduces the power loss in the Rs for better efficiency. With its internal 2A, 100mΩ NMOS switch, the device can provide high efficiency even at heavy load. During the shutdown mode, the feedback resistor RS and the load are completely disconnected and the current consumption is reduced to less than 1μA.The CXLE8291 is available in the 6-lead TSOT26 package.CXLE8291是采用PWM控制模式开关型DC-DC升压恒流驱动，用于驱动3W大功率白光LED。LED电流可通过外部反馈电阻调节500mA~1A输出，95mV的反馈电压可以有效</span>减少外部电阻的损耗。固定1MHZ开关频率。使用较小的电感和陶介电容。输入电压：1.8－3.6V。LED电流可通过外部电阻设定。反馈电压95mV。具有2A NMOS开关管（100mΩ）在高负载下可提供高效率。通过DC直流电压加到FB端对LED亮度进行细调或PWM信号加到SHDN。LED功能效率达：90％。电流精度：±5％。低启动电压：0.9V（Iled＝270mA）.低维持电压：0.75V（LED电流＝200mA）。内部2AMOSFET开关。开路LED保护。过温保护，带过压保护可空载。</span>封装：SOT23-6。</span>　

   产品特点 返回TOPhUw嘉泰姆

   LED Power Efficiency: up to 90%hUw嘉泰姆

 Current Accuracy: 5%(VIN = 3.6V to 1.8V @VF = 3.7V)hUw嘉泰姆

 Low Start-Up Voltage: 0.9V (ILED = 270mA)hUw嘉泰姆

 Low Hold Voltage: 0.75 (ILED = 200mA)hUw嘉泰姆

 1MHz Switching FrequencyhUw嘉泰姆

 Uses Small, Low Profile External ComponentshUw嘉泰姆

 Low RDS(ON): 100mΩ (typ)hUw嘉泰姆

 Over Temperature ProtectionhUw嘉泰姆

 Low Profile TSOT26 PackagehUw嘉泰姆

 Pb-Free PackagehUw嘉泰姆

   应用范围 返回TOPhUw嘉泰姆

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