LM3444
- Application Voltage Range: 80 VAC to 277 VAC
- Capable of Controlling LED Currents
Greater than 1 A - Adjustable Switching Frequency
- Low Quiescent Current
- Adaptive Programmable Off-Time Allows for
Constant Ripple Current - Thermal Shutdown
- No Flicker at 120 Hz
- Low-Profile 10-Pin VSSOP Package
or 8-Lead SOIC Package - Patented Drive Architecture
The LM3444 is an adaptive constant off-time AC/DC buck (step-down) constant current controller that provides a constant current for illuminating high power LEDs. The high-frequency capable architecture allows the use of small external passive components. A passive PFC circuit ensures good power factor by drawing current directly from the line for most of the cycle, and provides a constant positive voltage to the buck regulator. Additional features include thermal shutdown, current limit and VCC undervoltage lockout. The LM3444 is available in a low profile 10-pin VSSOP package or an 8-lead SOIC package.
技術文件
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| 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 | LM3444 AC-DC Offline LED Driver datasheet (Rev. D) | PDF | HTML | 2015/12/31 | ||
| 白皮書 | Common LED Functions and LED Driver Design Considerations | 2020/9/21 | ||||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 應用說明 | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 2013/5/3 | ||||
| 應用說明 | AN-2097 LM3444 - 230VAC, 8W Isolated Flyback LED Driver (Rev. F) | 2013/5/1 | ||||
| 應用說明 | AN-2082 LM3444 -120VAC, 8W Isolated Flyback LED Driver (Rev. E) | 2013/5/1 | ||||
| 使用指南 | AN-2083 LM3444 A19 Edison Retrofit Evaluation Board (Rev. C) | 2013/5/1 | ||||
| 應用說明 | An Improved Line Regulation Solution Used in LM3444/5 Non-Isolated LED Lighting | 2012/10/25 | ||||
| 使用指南 | LM3444 MR16 Buck-Boost Reference Design (Rev. A) | 2012/2/17 | ||||
| 使用指南 | LM3444 MR16 Boost Reference Design User Guide (Rev. A) | 2012/2/13 |
設計與開發
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VSSOP (DGS) | 10 | Ultra Librarian |
| SOIC (D) | 8 | Ultra Librarian |