首頁 電源管理 LED 驅動器 照明 LED 驅動器
首頁
電源管理
LED 驅動器
照明 LED 驅動器

LM3445

現行

Triac 可調光離線式 LED 驅動器

立即訂購
產品規格表

LM3445

現行
產品規格表 立即訂購

產品詳細資料

Input voltage type AC/DC Topology Buck, Flyback Vin (min) (V) 8 Vin (max) (V) 12 Vout (max) (V) 60 Vout (min) (V) 9 Iout (max) (A) 2 Iq (typ) (mA) 2 Features Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Forward Phase (Triac), PWM, Reverse Phase Number of channels 1 Rating Catalog
Input voltage type AC/DC Topology Buck, Flyback Vin (min) (V) 8 Vin (max) (V) 12 Vout (max) (V) 60 Vout (min) (V) 9 Iout (max) (A) 2 Iq (typ) (mA) 2 Features Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Forward Phase (Triac), PWM, Reverse Phase Number of channels 1 Rating Catalog
SOIC (D) 14 51.9 mm² 8.65 x 6 VSSOP (DGS) 10 14.7 mm² 3 x 4.9
  • TRIAC Dim Decoder Circuit for LED Dimming
  • 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 120-Hz Flicker
  • Low Profile 10-Pin VSSOP Package or 14-Pin
    SOIC
  • Patented Drive Architecture
  • TRIAC Dim Decoder Circuit for LED Dimming
  • 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 120-Hz Flicker
  • Low Profile 10-Pin VSSOP Package or 14-Pin
    SOIC
  • Patented Drive Architecture

The LM3445 is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be compatible with TRIAC dimmers. The LM3445 provides a constant current for illuminating high power LEDs and includes a TRIAC dim decoder. The dim decoder allows wide range LED dimming using standard TRIAC dimmers. The high frequency capable architecture allows the use of small external passive components. The LM3445 includes a bleeder circuit to ensure proper TRIAC operation by allowing current flow while the line voltage is low to enable proper firing of the TRIAC. 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 under-voltage lockout.

The LM3445 is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be compatible with TRIAC dimmers. The LM3445 provides a constant current for illuminating high power LEDs and includes a TRIAC dim decoder. The dim decoder allows wide range LED dimming using standard TRIAC dimmers. The high frequency capable architecture allows the use of small external passive components. The LM3445 includes a bleeder circuit to ensure proper TRIAC operation by allowing current flow while the line voltage is low to enable proper firing of the TRIAC. 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 under-voltage lockout.
open-in-new 尋找其它 照明 LED 驅動器
下載 觀看有字幕稿的影片 影片

技術文件

star =TI 所選的此產品重要文件
找不到結果。請清除您的搜尋條件，然後再試一次。
檢視所有 13
類型 標題 日期
* Data sheet LM3445 TRIAC Dimmable Offline LED Driver datasheet (Rev. M) PDF | HTML 2015年 11月 30日
White paper Common LED Functions and LED Driver Design Considerations 2020年 9月 21日
Selection guide Power Management Guide 2018 (Rev. R) 2018年 6月 25日
User guide 120Vac Valley Fill Buck Triac Dimmable LED Driver 2015年 5月 12日
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 2013年 5月 3日
EVM User's guide AN-1935 LM3445 Off-Line TRIAC Dimmer LED Driver Demo Board (Rev. I) 2013年 5月 1日
EVM User's guide AN-1978 LM3445 120VAC Small Evaluation Board (Rev. G) 2013年 5月 1日
User guide AN-1995 LM3445 208-277V AC Non-Isolated Evaluation PCB (Rev. B) 2013年 5月 1日
Application note AN-2034 LM3445 -120VAC, 8W Isolated Flyback LED Driver (Rev. C) 2013年 5月 1日
User guide AN-2061 LM3445 A19 Edison Retrofit Evaluation Board (Rev. C) 2013年 5月 1日
Application note An Improved Line Regulation Solution Used in LM3444/5 Non-Isolated LED Lighting 2012年 10月 25日
User guide 230 Vac Off-line Triac Dimmer Retrofit with 6 LEDs Reference Design User Guide 2012年 1月 27日
Application note AN-2069 LM3445 - 230VAC, 6W- 15W Isolated Flyback LED Driver (Rev. B) 2010年 11月 23日

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)。

開發板

LM3445-120VFLBK — 針對 120V 輸入隔離應用最佳化的 120VFLBK-LM3445 評估板

This demonstration board highlights the performance of a LM3445 based Flyback LED driver solution that can be used to power a single LED string consisting of 4 to 8 series connected LEDs from an 90 VRMS to 135 VRMS, 60 Hz input power supply. The key performance characteristics under typical (...)

TI.com 無法提供
開發板

LM3445-EDSNEV — EDSNEV - 針對小型解決方案進行最佳化的 10W、非隔離 LM3445 評估板

The evaluation board included in this shipment converts 85VAC to 135VAC input and drives five to thirteen series connected LED`s at the currents listed in the Evaluation Board Operating Conditions section. This is a two-layer board using the bottom and top layer for component placement. The board (...)

使用指南: PDF
TI.com 無法提供
開發板

LM3445EVM-695 — LM3445 120Vac 填谷式降壓 Triac 可調光 LED 驅動器評估模組

The LM3445EVM-695 implements a dimming solution using the LM3445 integrated circuit from Texas Instruments. The LM3445 is an adaptive constant off-time AC/DC buck constant current controller with built in phase dimming decoder. Line cycles are analyzed continuously by an internal low power digital (...)

使用指南: PDF
TI.com 無法提供
模擬工具

PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
要求
參考設計

PMP30439 — 230 V 輸入至 180 V 輸出於 200 mA 定電流 LED 驅動器參考設計

This reference design is a low-side Buck (the output voltage is referenced to the positive DC input (+Vin node), not to the GND node). The controller drives a LED string up to 180V with 200mA constant current. The low-side Buck topology simplifies the schematic thanks to direct-driving of the FET, (...)
Test report: PDF
電路圖: PDF
封裝 引腳 下載
SOIC (D) 14 檢視選項
VSSOP (DGS) 10 檢視選項
適用 TI 的評估品項標準條款與條件。

訂購與品質

內含資訊：
  • RoHS
  • REACH
  • 產品標記
  • 鉛塗層/球物料
  • MSL 等級/回焊峰值
  • MTBF/FIT 估算值
  • 材料內容
  • 資格摘要
  • 進行中可靠性監測
內含資訊：
  • 晶圓廠位置
  • 組裝地點

支援與培訓

內含 TI 工程師技術支援的 TI E2E™ 論壇

以英文檢視所有論壇主題

內容係由 TI 和社群貢獻者依「現狀」提供，且不構成 TI 規範。檢視使用條款。

若有關於品質、封裝或訂購 TI 產品的問題，請參閱 TI 支援。​​​​​​​​​​​​​​

影片