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.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LM3435 Compact Sequential Mode RGB LED Driver with I 2 C Control Interface datasheet (Rev. C) | 2013/5/2 | |||
| 白皮書 | Common LED Functions and LED Driver Design Considerations | 2020/9/21 | ||||
| 應用說明 | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 2013/5/3 |
設計與開發
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LM3435EVAL — Pico 投影儀 LED 驅動器評估板
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 (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WQFN (RSB) | 40 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。