TPS61042
- Current Source With Overvoltage Protection
- Input Voltage Range: 1.8 V to 6 V
- Internal 30 V Switch
- Up to 85% Efficiency
- Precise Brightness Control Using PWM Signal or
Analog Signal - Switching Frequency: Up to 1 MHz
- Internal Power MOSFET Switch: 500 mA
- Operates With Small Output Capacitors Down to 100 nF
- Disconnects LEDs During Shutdown
- No Load Quiescent Current: 38 µA Typ
- Shutdown Current: 0.1 µA Typ
- Available in a Small 3 mm × 3 mm QFN Package
The TPS61042 is a high frequency boost converter with constant current output that drives white LEDs or similar. The LED current is set with the external sense resistor (RS) and is directly regulated by the feedback pin (FB) that regulates the voltage across the sense resistor RS to 252 mV (typ). To control LED brightness, the LED current can be pulsed by applying a PWM (pulse width modulated) signal with a frequency range of 100 Hz to 50 kHz to the control pin (CTRL). To allow higher flexibility, the device can be configured where the brightness can be controlled by an analog signal as well, as described in the application information section. To avoid possible leakage currents through the LEDs during shutdown, the control pin (CTRL) disables the device and disconnects the LEDs from ground. For maximum safety during operation, the output has integrated overvoltage protection that prevents damage to the device in case of a high impedance output (e.g. faulty LED).
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 数据表 | TPS61042 Constant Current LED Driver 数据表 (Rev. D) | PDF | HTML | 2014-12-3 | ||
| 应用手册 | QFN 和 SON PCB 连接 (Rev. C) | PDF | HTML | 英语版 (Rev.C) | PDF | HTML | 2024-1-5 | |
| 白皮书 | 常见 LED 功能和 LED 驱动器设计注意事项 | 英语版 | 2020-9-21 | |||
| 应用手册 | Performing Accurate PFM Mode Efficiency Measurements (Rev. A) | 2018-12-11 | ||||
| 选择指南 | 电源管理指南 2018 | 2018-7-31 | ||||
| 应用手册 | Optimizing Transient Response of Internally Compensated DC-DC Converters (Rev. B) | 2017-11-29 | ||||
| 应用手册 | Extending the Soft Start Time Without a Soft Start Pin (Rev. B) | 2017-6-15 | ||||
| 模拟设计期刊 | DC/DC 转换器中电阻式反馈分压器设计考虑因素 | 英语版 | 2012-6-1 | |||
| 模拟设计期刊 | IQ：它是什么、不是什么以及如何使用 | 英语版 | 2011-8-17 | |||
| 应用手册 | White Light LED Driver With Gradual Dimming (Rev. A) | 2007-1-10 | ||||
| 应用手册 | Single Cell TPS61041 LED Driver | 2003-6-9 | ||||
| 白皮书 | White LED Power Supply Design Techniques | 2003-2-18 | ||||
| 应用手册 | High Voltage Power Supply Using the TPS61040 | 2002-7-9 |
设计与开发
如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。
TPS61042EVM-226 — 用于具有 PWM 亮度控制的恒流白光 LED 电源的 TPS61042 EVM
The TPS61042EVM-226 is an evaluation tool for the TPS61042 inductive boost converter in 3x3mm2 QFN that can supply voltages up to 28V from input voltages in the range of 1.8V to 6V. The EVM is configured to supply a 20-mA bias current to 4 on-board white LEDs. The EVM can also be used to evaluate (...)
TIDM-CONNECTED-ETHERNET — 联网型以太网、USB 与 LCD 参考设计
此参考设计将展示多种支持以太网和 LCD 的应用，例如远程传感器监测、通过基于网络的 LCD 仪表板进行以太网配置以及与天气网站连接的感知应用。
TIDM-TM4C129CAMERA — 用于 ARM® Cortex®-M 微控制器 (MCU) 的摄像头参考设计
此设计使用 QVGA 显示面板来实现网络摄像头，并利用嵌入式 Web 服务器进行远程监控。 凭借用于 Web 服务器的 250KB 内存容量，TM4C129x 微控制器上有足够的存储器可用于额外定制。
TIDM-TM4C129XSDRAM — 在高性能微控制器上连接 SDRAM 存储器
该参考设计演示了如何实现 SDRAM 存储器并将其连接到高性能微控制器 TM4C129XNCZAD。该实现方案是通过使用微控制器的 EPI 接口在 60MHz 上连接 256Mbit SDRAM 来实现的。这样，开发人员在与高速 LCD 面板连接时，可以实现额外的存储器用来存储为代码和数据。
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| VSON (DRB) | 8 | Ultra Librarian |
订购和质量
推荐产品可能包含与 TI 此产品相关的参数、评估模块或参考设计。