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首页 > 产品中心 > LED驱动电路 > LED背光 > 电荷泵型LED背光 >CXLE8177充电泵用于LCD显示屏背光应用中的白色LED电源的脉宽调制亮度控制适合由单个锂离子电池或三到四个镍镉镍氢或碱性电池供电的所有应用
CXLE8177充电泵用于LCD显示屏背光应用中的白色LED电源的脉宽调制亮度控制适合由单个锂离子电池或三到四个镍镉镍氢或碱性电池供电的所有应用
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CXLE8177是一款充电泵,具有用于LCD显示屏背光应用中的白色LED电源的脉宽调制亮度控制。电源电压从2.7伏到5.5伏不等,非常适合由一个锂离子电池或三到四个镍镉、镍氢或碱性电池供电的所有应用。该装置为每个LED提供恒定电流,初始电流值可由外部电阻器设置。利用1×/1.5×分数变换技术,结合极低漏电流源,实现了高效率。
CXLE8177能够以每通道30毫安的速度从2.7伏到5.5伏的输入驱动多达三个LED通道。此外,电流控制电荷泵确保低输入电流纹波和电磁干扰。低外部部件计数(两个0.47μF飞行电容器和两个1μF小电容器,在车辆识别号和输出电压)使该部件非常适合小型电池供电应用。

CXLE8177充电泵用于LCD显示屏背光应用中的白色LED电源的脉宽调制亮度控制适合由单个锂离子电池或三到四个镍镉镍氢或碱性电池供电的所有应用
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1.产品概述       2.产品特点     f5P嘉泰姆

3.应用范围       4.技术规格书下载(PDF文档)f5P嘉泰姆

5.产品封装       6.电路原理图  f5P嘉泰姆

7.相关产品f5P嘉泰姆

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The CXLE8177 is a charge pump with PWM brightness control for white LED supplies in LCD display backlight applications. The supply voltage ranges from 2.7V to 5.5V, it is ideally suited for all applications powered by a single Li-ion battery cell or three to four NiCd, NiMH, or alkaline battery cells.f5P嘉泰姆

 f5P嘉泰姆

The device provides a constant current for each LED, and the initial current value can be set by an external resistor. High efficiency is achieved by utilizing a 1×/1.5× fractional conversion technique in combination with very low dropout current sources.f5P嘉泰姆

 f5P嘉泰姆

The CXLE8177 is capable of driving up to three channels of LEDs at 30mA per channel from a 2.7V to 5.5V input. Additionally, the current controlled charge pump ensures low input current ripple and EMI. A low external part count (two 0.47μF flying capacitors and two small 1μF capacitors at VIN and VOUT) makes this part ideally suited for small, battery-powered applications.f5P嘉泰姆

 f5P嘉泰姆

The CXLE8177 is available in a Green, space-saving TQFN-3×3-16L package, and is rated over the -40℃ to +85℃ temperature range.f5P嘉泰姆

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• Input Voltage Range: 2.7V to 5.5Vf5P嘉泰姆
• Drives up to 3 LEDs at 30mA Eachf5P嘉泰姆
• LED Brightness Control Through PWM Control Signalf5P嘉泰姆
• High Efficiency by Fractional Conversion with 1×f5P嘉泰姆
    and 1.5× Modesf5P嘉泰姆
• Switching Frequency: 1MHzf5P嘉泰姆
• Regulated Output Current with 0.5% Matchingf5P嘉泰姆
• Internal Soft-Start Limits Inrush Currentf5P嘉泰姆
• Low Input Ripple and Low EMIf5P嘉泰姆
• Over-Current and Over-Temperature Protectionf5P嘉泰姆
• Under-Voltage Lockout with Hysteresisf5P嘉泰姆
• Green TQFN-3×3-16L Packagef5P嘉泰姆

   应用范围 返回TOPf5P嘉泰姆


Cellular Phonesf5P嘉泰姆
Smart Phonesf5P嘉泰姆
Digital Camerasf5P嘉泰姆
Handheld PCsf5P嘉泰姆
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PDAsf5P嘉泰姆
Keypad Backlightf5P嘉泰姆

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     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f5P嘉泰姆

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