LM3405
- VIN Operating Range of 3 V to 15 V
- Drives up to 5 High-Brightness LEDs in Series at 1 A
- Thin SOT-6 Package
- 1.6-MHz Switching Frequency
- EN/DIM Input for Enabling and PWM Dimming of LEDs
- 300-mΩ NMOS Switch
- 40-nA Shutdown Current at VIN = 5 V
- Internally Compensated Current-mode Control
- Cycle-by-Cycle Current Limit
- Input Voltage UVLO
- Overcurrent Protection
- Thermal Shutdown
The LM3405 is a 1-A constant current buck LED driver designed to provide a simple, high efficiency solution for driving high power LEDs. With a 0.205-V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as required for driving various types of LEDs. Switching frequency is internally set to 1.6 MHz, allowing small surface mount inductors and capacitors to be used. The LM3405 uses current-mode control and internal compensation offering ease of use and predictable, high performance regulation over a wide range of operating conditions. With a maximum input voltage of 15 V, the device can drive up to 3 High-Brightness LEDs in series at 1-A forward current, with the single LED forward voltage of approximately 3.7 V. Additional features include user accessible EN/DIM pin for enabling and PWM dimming of LEDs, thermal shutdown, cycle-by-cycle current limit and overcurrent protection.
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 | LM3405 1.6-MHz, 1-A Constant Current Buck Regulator For Powering LEDS 数据表 (Rev. C) | PDF | HTML | 2016-12-23 | ||
| 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 | ||||
| 应用手册 | Powering & Dimming High-Brightness LEDs w/ LM3405 Constant-Current Buck Reg (Rev. A) | 2013-5-1 | ||||
| 用户指南 | AN-1685 LM3405A Demo Board (Rev. B) | 2013-5-1 | ||||
| 应用手册 | AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) | 2013-4-23 | ||||
| 应用手册 | Application Note 1685 LM3405A Demo Board (cn) | 2007-10-19 |
设计与开发
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LM3405XEVAL — 为 LED 供电的 1.6MHz 1A 恒流降压稳压器
The LM3405 demo board is configured to drive a series string of high power, high brightness LEDs at a forward current of 1A using the LM3405 constant current buck regulator. The board can accept a full input operating range of 3V to 15V. The converter output voltage adjusts as needed to maintain a (...)
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| SOT-23-THN (DDC) | 6 | Ultra Librarian |
订购和质量
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