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
- Adjustable Constant Current up to 500 mA (±5%)
- Wide Input Voltage Range up to 42 V
- Low Drop Voltage
- Open-Load Detection
- Overtemperature Protection
- Short-Circuit Proof
- Reverse-Polarity Proof
- Wide Temperature Range: –40°C to 150°C
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
- TL4242 数据资料 dataSheet 下载.PDF
- TI 德州仪器照明解决方案产品选型与价格 . xls
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- 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 |