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LM3445

ACTIVO

Controlador LED fuera de línea atenuable Triac

Detalles del producto

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
VSSOP (DGS) 10 14.7 mm² (3 mm × 4.9 mm) SOIC (D) 14 51.9 mm² (8.65 mm × 6 mm)
  • 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.

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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos LM3445 TRIAC Dimmable Offline LED Driver datasheet (Rev. M) PDF | HTML 30/11/2015
Informe Common LED Functions and LED Driver Design Considerations 21/09/2020
Guía de selección Power Management Guide 2018 (Rev. R) 25/06/2018
EVM User's guide 120Vac Valley Fill Buck Triac Dimmable LED Driver 12/05/2015
Nota sobre la aplicación AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 3/05/2013
EVM User's guide AN-1935 LM3445 Off-Line TRIAC Dimmer LED Driver Demo Board (Rev. I) 1/05/2013
Guía del usuario AN-2061 LM3445 A19 Edison Retrofit Evaluation Board (Rev. C) 1/05/2013
Nota sobre la aplicación AN-2034 LM3445 -120VAC, 8W Isolated Flyback LED Driver (Rev. C) 1/05/2013
Guía del usuario AN-1995 LM3445 208-277V AC Non-Isolated Evaluation PCB (Rev. B) 1/05/2013
Nota sobre la aplicación An Improved Line Regulation Solution Used in LM3444/5 Non-Isolated LED Lighting 25/10/2012
Guía del usuario 230 Vac Off-line Triac Dimmer Retrofit with 6 LEDs Reference Design User Guide 27/01/2012
Nota sobre la aplicación AN-2069 LM3445 - 230VAC, 6W- 15W Isolated Flyback LED Driver (Rev. B) 23/11/2010

Diseño y desarrollo

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Placa de evaluación

LM3445EVM-695 — Módulo de evaluación de controlador LED atenuable Triac reductor de llenado de valle de 120 VCA LM34

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 (...)

Guía del usuario: PDF
Productos y hardware compatibles
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Diseño de referencia

PMP30439 — Diseño de referencia de controlador de LED de 230 V de entrada a 180 V de salida a 200 mA de corrien

Este diseño de referencia es un buck de lado bajo (el voltaje de salida está referenciado al nodo de entrada de CC positiva (+Vin), no al nodo GND). El controlador acciona una cadena LED de hasta 180 V con corriente constante 200 mA. La topología buck de lado bajo simplifica el esquema gracias al (...)
Productos y hardware compatibles
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
VSSOP (DGS) 10 Ultra Librarian
SOIC (D) 14 Ultra Librarian

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