LM2794TL 恒流LED驱动电源IC PWM，切换式电容器 背光 325KHz ~ 675KHz 2.7V ~ 5.5V 3.8V TLP14EHA 35AC 电流调节开关电容/LED电源与模拟/PWM亮度控制
恒流Constant Current| 是 YES \---|--- 恒压Constant Voltage| 拓扑Topology| PWM，切换式电容器（充电泵） PWM, Switched Capacitor Charge Pump 输出数Number of Outputs| 4 内部驱动器Internal Driver| 是 YES 初级类型Type - Primary| 背光 Backlight 次级类型Type - Secondary| 白色 LED White LED 频率Frequency| 325KHz ~ 675KHz 电源电压Voltage - Supply| 2.7V ~ 5.5V 输出电压Voltage - Output| 3.8V Description & Applications| FEATURES • Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control • Regulated current sources with ±0.5% matching between any two outputs • High efficiency 3/2 boost function • Drives one, two, three or four white LEDs • 2.7V to 5.5V Input Voltage • Up to 80mA output current • Analog brightness control • Active-low or high shutdown input ’94/95 • Very small solution size and no inductor • 2.3µA typ. shutdown current • 325kHz switching frequency min. • Constant Frequency generates predictable noise spectrum • Standard Micro SMD-14 package: 2.08mmX2.403mmX0.845mm High • Thin Micro SMD-14 package: 2.08mmX2.403mm X0.600mm High Applications • White LED Display Backlights • White LED Keypad Backlights • 1-Cell Li-Ion battery-operated equipment including PDAs, hand-held PCs, cellular phones 描述与应用| 特点 •电流调节开关电容LED电源与模拟和PWM亮度控制 •稳压电流源匹配±0.5％任何两个输出之间 •高效率升压功能3/2 •驱动一个，两个，三个或四个白光LED •2.7V至5.5V的输入电压 •高达80mA的输出电流 •模拟亮度控制 •主动高或低关断输入（94/95） •非常小的解决方案尺寸和无电感器 •2.3μA（典型值）的关断电流 •325kHz开关频率（分钟） •恒频产生可预见的噪声频谱 •标准微SMD-14封装：2.08mmX2.403mmX0.845mm高 •薄微型SMD-14封装：2.08mmX2.403mm X0.600mm高 应用 •白光LED显示器背光 •白光LED键盘背光 •1节锂离子电池供电设备，包括掌上电脑，手持电脑，蜂窝电话
