内部集成了N-FET，可以驱动串联9~10颗白光LED，LED电流可以通过多种方式来做调整 CXLE8257 1.1MHz, High-Efficiency, Step-Up Converter for 8 to 10 White LEDs or 3 ~12 LED,1.1MHZ的工作频率减小了输入输出电容选择和纹波。OVP管脚避免了输出过压烧毁芯片的可能。内部集成的软启动降低了启动过充电流

                          目录vhU嘉泰姆

   1.产品概述      2.产品特点      3.应用范围     4.技术规格书下载（PDF文档）</span>vhU嘉泰姆

   5.产品封装      6.电路原理图</strong>     7.相关产品vhU嘉泰姆

一.产品概述vhU嘉泰姆

                   CXLE8257是一款固定频率电流模式的升压转换器，内部集成了N-FET，可以驱动串联9~10颗白光LED，LED电流可以通过多种方式来做调整，1.1MHZ的工作频率减小了输入输出电容选择和纹波。OVP管脚避免了输出过压烧毁芯片的可能。内部集成的软启动降低了启动过充电流。还集成了欠压保护、过热保护、过流保护功能。封装为超小型的SOT23-6封装。</span>vhU嘉泰姆

              CXLE8257驱动能力很强，最多可以驱动3串12并共36个LED。</span>vhU嘉泰姆

     The CXLE8257 is a current-mode and fixed frequency boost converter with an integrated N-FET to drive up to 8~10 white LEDs in series. The series connection allows the LED current to be identical for uniform brightness. Its low on resistance of N- FET and feedback voltage reduce power loss and achieve high efficiency. Fast 1.1MHz current-mode PWM operation is available for input and output capacitors and a small inductor while minimizing ripple on the input supply. The OVP pin monitors the output voltage and stops switching if exceeds the over-voltage threshold. An internal soft-start circuit eliminates the inrush current during startup.      The CXLE8257 also integrates undervoltage lockout, over-temperature protection, and current limit circuits. The CXLE8257 is available in a SOT-23-6 package.  
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二.产品特点vhU嘉泰姆

● 输入电压范围：2.5V~6VvhU嘉泰姆

● 0.3V 参考电压</span>vhU嘉泰姆

● 固定的1.1MHZ开关频率</span>vhU嘉泰姆

● 效率达到87%（10*3）或93%（3*12）</span>vhU嘉泰姆

● 100Hz到100KHz PWM占空比调光</span>vhU嘉泰姆

● 支持欠压保护vhU嘉泰姆

● 支持过温保护vhU嘉泰姆

● 1.3A输入过流保护vhU嘉泰姆

● 40V OVP电压vhU嘉泰姆

● 可以驱动3串9并或3串12并白光LEDvhU嘉泰姆

●&lt;1uA的shun down 电流vhU嘉泰姆

● SOT23-6封装vhU嘉泰姆

● 无铅封装，符合ROHS标准vhU嘉泰姆

• Wide input Voltage from 2.5V to 6V vhU嘉泰姆

• 0.3V Reference Voltage vhU嘉泰姆

• Fixed 1.1MHz Switching Frequency vhU嘉泰姆

• High Efficiency up to 87% vhU嘉泰姆

• Wide Range for PWM Dimming (100Hz to200kHz) vhU嘉泰姆

• Under-Voltage Lockout Protection vhU嘉泰姆

• Over-Temperature Protection vhU嘉泰姆

• 40V Over voltage protection vhU嘉泰姆

•<1μA Quiescent current During Shutdown vhU嘉泰姆

• SOT23-6 Package vhU嘉泰姆

• Lead Free and Green Devices Available (ROHS Compliant)vhU嘉泰姆

三.应用范围vhU嘉泰姆

● 功能手机、智能手机</span>vhU嘉泰姆

● PDA、PMP、MP3vhU嘉泰姆

● 数码相机vhU嘉泰姆

● 白光LED显示屏的驱动vhU嘉泰姆

• Cell Phone and Smart Phone vhU嘉泰姆

• PDA,PMP,MP3 vhU嘉泰姆

• Digital Camera vhU嘉泰姆

• White LED Display Backlighting    
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四.技术规格书（产品PDF)vhU嘉泰姆

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持</span>！</span>vhU嘉泰姆

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五.产品封装图</span>vhU嘉泰姆

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六.电路原理图</strong>vhU嘉泰姆

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七.相关芯片选择指南   更多同类产品......vhU嘉泰姆