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LT3743IFEPBF

LT3743IFEPBF

  • 厂商:

    LINER

  • 封装:

  • 描述:

    LT3743IFEPBF - High Current Synchronous Step-Down LED Driver with Three-State Control - Linear Techn...

  • 详情介绍
  • 数据手册
  • 价格&库存
LT3743IFEPBF 数据手册
FEATURES n n n n n n n n n n LT3743 High Current Synchronous Step-Down LED Driver with Three-State Control DESCRIPTION The LT®3743 is a fixed frequency synchronous step-down DC/DC controller designed to drive high current LEDs. The average current mode controller will maintain inductor current regulation over a wide output voltage range of 0V to (VIN – 2V). LED dimming is achieved through analog dimming on the CTRL_L, CTRL_H and CTRL_T pins and with PWM dimming on the PWM and CTRL_SEL pins. Through the use of externally switched load capacitors, the LT3743 is capable of changing regulated LED current levels within several μs, providing accurate, high speed PWM dimming between two current levels. The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin. Additional features include voltage regulation and overvoltage protection set with a voltage divider from the output to the FB pin. Overcurrent protection is provided and set by the CTRL_H pin. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7199560, 7321203 and others pending. PWM Dimming Provides Up to 3000:1 Dimming Ratio CTRL_SEL Dimming Provides Up to 3000:1 Dimming Ratio Between Any Current Three-State Current Control for Color Mixing 6% Current Regulation Accuracy 6V to 36V Input Voltage Range Average Current Mode Control 2μs Maximum Recovery Time Between Any Current Regulation State
LT3743IFEPBF
1. 物料型号: - LT3743:High Current Synchronous Step-Down LED Driver with Three-State Control。

2. 器件简介: - LT3743是一款固定频率同步降压DC/DC控制器,专为驱动高电流LED而设计。它支持模拟调光和PWM调光,能够实现高达3000:1的调光比例。该控制器还具备三态电流控制,适用于颜色混合,并且有6%的电流调节精度。

3. 引脚分配: - 28引脚塑料QFN和TSSOP封装,具体引脚功能包括GND、EN/UVLO、$V_{REF}$、CTRL_T、CTRL_H、CTRL_L、SS、FB、SENSE+、SENSE–等。

4. 参数特性: - 输入电压范围:6V至36V。 - 调光功能:PWM调光和CTRL_SEL调光都能实现高达3000:1的调光比例。 - 最大恢复时间:2μs。 - 关断电流:<1μA。 - 热增强型4mm×5mm QFN和28引脚FE封装。

5. 功能详解: - LT3743具有电压调节和过压保护功能,可通过FB引脚设置。 - 通过CTRL_L和CTRL_H引脚进行电流控制,CTRL_T引脚用于根据温度降低LED电流。 - PWM调光通过PWM和CTRL_SEL引脚实现,可在两个电流级别之间进行精确、高速的PWM调光。

6. 应用信息: - 适用于DLP投影仪、高功率建筑照明和激光二极管等应用。 - 通过外部电阻设置开关频率,范围从200kHz到1MHz。 - 通过RT引脚的电阻设置同步功能,以实现外部时钟同步。

7. 封装信息: - 28引脚(4mm×5mm)塑料QFN和28引脚塑料TSSOP封装。 - 温度范围从-40°C到125°C。
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