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TL4242 可调节 LED 驱动器

TL4242
Output Channels 1
Per Channel Drive(mA) 500
Data Input 1
Data Vin(Min)(V) 4.5
Data Vin(Max)(V) 42
LED Voltage(Max)(V) 42
Pin/Package 8SON
Approx. Price (US$) 0.35 | 1ku
TL4242 描述

The TL4242 is an integrated adjustable constant-current source, driving loads up to 500 mA. The output current level can be adjusted via an external resistor. The device is designed to supply high-power LEDs (for example, OSRAM Dragon LA W57B) under the severe conditions of automotive applications, resulting in constant brightness and extended LED lifetime. It is provided in the DRJ (QFN) package. Protection circuits prevent damage to the device in case of overload, short circuit, reverse polarity, and overheat. The connected LEDs are protected against reverse polarity as well as excess voltages up to 45 V. The integrated PWM input of the TL4242 permits LED brightness regulation by pulse-width modulation (PWM). Due to the high input impedance of the PWM input, the LED driver can be operated as a protected high-side switch. The TL4242 is characterized for operation from –40°C to 150°C. An external shunt resistor in the ground path of the connected LEDs is used to sense the LED current. A regulation loop holds the voltage drop at the shunt resistor at a constant level of 177 mV (typical). The constant-current level can be adjusted by selecting the shunt resistance, RREF. Calculate the typical output current using the equation: IQ,typ = VREF/RREF where VREF is the reference voltage (typically 177 mV) (see Reference Electrical Characteristics). The equation applies for RREF = 0.39 to 10 . The output current is shown as a function of the reference resistance in Figure 1. With the PWM input, the LED brightness can be regulated via duty cycle. Also, PWM = L sets the TL4242 in sleep mode, resulting in a very low current consumption of

TL4242 特性
TL4242 芯片订购指南
器件 状态 温度 (oC) 价格(美元) | Quantity 封装 | 引脚 封装数量 | 封装载体 丝印标记
TL4242DRJR ACTIVE -40 to 85 0.35 | 1ku SON (DRB) | 8 1000 | LARGE T&R  
TL4242 质量与无铅数据
器件 环保计划* 铅/焊球涂层 MSL 等级/回流焊峰 环保信息与无铅 (Pb-free) DPPM / MTBF / FIT 率
TL4242RGER Green (RoHS & no Sb/Br) CU NIPDAU Level-3-260C-168 HR TL4242RGER TL4242RGER
TL4242 应用技术支持与电子电路设计开发资源下载
  1. TL4242 数据资料 dataSheet 下载.PDF
  2. TI 德州仪器照明解决方案产品选型与价格 . xls
  3. 照明和显示屏电源选择指南 (PDF 1427 KB)
  4. 笔记本电脑指南 (Rev. A) (PDF 2774 KB)
  5. 全面认识开关型电源中的BUCK-BOOST功率级 (Rev. A) (PDF 2206 KB)
  6. PowerPADTM Made Easy (PDF 57 KB)
  7. 标准线性产品交叉参考 (Rev. D) (PDF 1058 KB)
  8. 模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
  9. 所选封装材料的热学和电学性质 (PDF 645 KB)
  10. 高速数据转换 (PDF 1967 KB)
TL4242 相关工具
名称 型号 公司 工具/软件类型
TL4242 评估模块 TL4242EVM-543 Texas Instruments 开发电路板/EVM
TL4242 评估模块 TL4242EVM Texas Instruments 开发电路板/EVM