LM3447
- Integrated Phase Angle Decode
- Leading and Trailing Edge Compatible
- Over 50:1 Dimming Range
- Power Factor Correction with Low Total Harmonic Distortion
- Primary Side Control Using Input Voltage Feedforward Technique
- Input Power Regulation Scheme with Improved Line Regulation
- Constant Power Operation of LEDs to Compensate for Forward Voltage
Variations Over Temperature and Lifetime - Fixed Frequency Discontinuous Conduction Mode Operation
- Valley Switching Operation to Achieve High Efficiency and Low EMI
- Efficient TRIAC Hold Current Management
- Thermal Foldback Function for LED Protection
- LED Open Circuit and Short Circuit Protection
The LM3447 is a versatile power factor correction (PFC) controller designed to meet the performance requirements of residential and commercial phase-cut dimmer compatible LED lamp drivers. The device incorporates a phase decoder circuit and an adjustable hold current circuit to provide smooth, flicker free dimming operation. A proprietary primary side control technique based on input voltage feedforward is used to regulate the input power drawn by the LED driver and to achieve line regulation over a wide range of input voltage. Valley switching operation is implemented to minimize switching loss and reduce EMI. An internal thermal foldback circuit is provided to protects the LEDs from damage based on the temperature sensed by a single external NTC resistor. Additional features include LED open circuit and short circuit protection, cycle-by-cycle FET over-current protection, burst mode fault operation using an internal 812ms fault timer and internal thermal shutdown.
The LM3447 is ideal for implementing dimmable, isolated single stage LED lamp drivers where simplicity, low-component count and small solution size are of primary importance. This device is currently available in a TSSOP 14-pin 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 | LM3447 Phase Dim, Primary Side PFC Flyback Controller for LED Lighting datasheet (Rev. A) | 2012/5/17 | |||
| 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 | ||||
| 使用指南 | Using the LM3447-PAR-230VEVM | 2012/8/7 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
LM3447-A19-120VEVM — 適用於 LED 照明的 LM3447 返馳控制器評估模組基板
LM3447-A19-230VEVM — 適用於 LED 照明的 LM3447 返馳控制器評估模組基板
LM3447DESIGN-CALC — LM3447 Design Tool
LM3447 設計計算機是 Excel 架構的設計工具，可協助判斷 LM3447 離線、相位可調光、一次側電源穩壓、PFC 返馳控制器的外部元件值。LM3447 AC/DC LED 驅動器適用於相位可調光（TRIAC 與後緣）LED 照明應用，如 LED 燈與崁燈
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (PW) | 14 | 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。