LM3435
- Sequential RGB Driving Mode
- Low Component Count and Small Solution Size
- Stable with Ceramic and Other Low ESR capacitors, No Loop Compensation Required
- Fast Transient Response
- Programmable Converter Switching Frequency up to 1 MHz
- MCU Interface Ready With I2C Bus
- Peak Current Limit Protection for the Switcher
- LED Fault Detection and Reporting via I2C Bus
Key Specifications
- Support up to 2A LED current
- Typical ±3% LED current accuracy
- Integrated N-Channel main and P-Channel synchronous MOSFETs
- 3 Integrated N-Channel current regulating pass switches
- LED Currents programmable via I2C bus independently
- Input voltage range: 2.7 – 5.5 V
- Thermal shutdown
- Thermally enhanced WQFN package
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The LM3435, a Synchronously Rectified non-isolated Flyback Converter, features all required functions to implement a highly efficient and cost effective RGB LED driver. Different from conventional Flyback converter, LEDs connect across the VOUT pin and the VIN pin through internal passing elements at corresponding LED pins. Thus, voltage across LEDs can be higher than, equal to or lower than the input supply voltage.
Load current to LEDs is up to 2A with voltage across LEDs ranging from 2.0V to 4.5V. Integrated N-Channel main MOSFET, P-Channel synchronous MOSFET and three N-Channel current regulating pass switches allow low component count, thus reducing complexity and minimize board size. The LM3435 is designed to work exceptionally well with ceramic output capacitors with low output ripple voltage. Loop compensation is not required resulting in a fast load transient response. Non-overlapping RGB LEDs are driven sequentially through individual control. Output voltage hence can be optimized for different forward voltage of LEDs during the non-overlapping period. I2C interface eases the programming of the individual RGB LED current up to 1,024 levels per channel.
The LM3435 is available in the thermally enhanced 40-pin WQFN package.
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 | LM3435 Compact Sequential Mode RGB LED Driver with I 2 C Control Interface 数据表 (Rev. C) | 2013-5-2 | |||
| 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 | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 2013-5-3 |
设计与开发
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LM3435EVAL — Pico 投影仪 LED 驱动器评估板
The LM3435 Evaluation Board has been designed for evaluating the performance of the device in a typical pico projector application. The end user can interface his own system to the evaluation board to test out the performance of the system. With LM3435, the system requires only single DC-DC (...)
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| WQFN (RSB) | 40 | Ultra Librarian |
订购和质量
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