TRIAC Dimmer | National Semiconductor — TRIAC Dimmer LED Drivers for AC LED Lighting Home->LED Drivers - LED Lighting Design

LM3445 TRIAC Dimmer LED Driver

Provides full range, flicker free dimming

LED Driver for TRIAC Dimmers

National's industry-leading TRIAC dimmable offline LED driver solution is perfect for any application where an LED driver must interface to a standard triac wall dimmer. National’s new TRIAC dimmable LED driver delivers a wide, uniform dimming range free of flicker, best-in-class dimming performance, and high efficiency—all while maintaining ENERGY STAR® power factor requirements in a typical application.

Conventional TRIAC dimmers are designed to interface to a resistive load (halogen or incandescent bulb), while today’s LED driver solutions interfaced to a standard wall dimmer produce 120 Hz flicker of the LED and/or do not allow 100:1 dimming. National's LM3445 LED driver decodes the TRIAC chopped waveform and translates the signal to dim the LEDs, to achieve a full, wide dimming range, without flicker.

LM3445 TRIAC Dimmable LED Driver

  • Application voltage range from 80 VAC to 270 VAC
  • Angle detector/decoder enables wide (100:1) full range dimming
  • Integrated 300Ω bleeder resistor to ensure proper TRIAC signal decoding
  • Patent-Pending control architecture allows for constant ripple current which extends the life of the LEDs
  • Scalable output current up to and greater than 1A
  • Master/Slave control for uniform dimming across multi-channel applications
  • Ideal dimming solution for MR16 & PAR20, PAR25, PAR30, PAR38 LED bulbs

 

Move the TRIAC dimmer slider to see the LM3445 in action

 

Easy To Use

The LM3445 LED driver enables a direct replacement of incandescent or halogen lamp systems that are currently interfaced to a TRIAC dimmer without having to change the original infrastructure or sacrifice performance. In addition, the LM3445 and other switching controller (switcher) constant-current LED drivers are available in WEBENCH® LED Designer to allow for easy and quick design in.

  

Full Range Dimming Capability

The LM3445 LED driver offers 100:1 full range dimming capability, going from full light to nearly imperceptible light in a continuous range without being extinguished, and maintains a constant current to large strings of LEDs driven in series off of a standard line voltage.

  

Uniform Dimming Without Flicker

The LM3445 LED driver allows master-slave operation control in multi-chip solutions which enables a single TRIAC dimmer to control multiple strings of LEDs with smooth consistent dimming, free of flicker.

 

TRIAC Dimmer Applications

Retro-fit of existing lighting systems that are interfaced to a TRIAC wall dimmer:

  • MR16 & PAR20, PAR25, PAR30, PAR38 LED bulbs
  • Residential Lighting
  • Architectural Lighting
  • Industrial & Commercial Lighting

 


Video: Learn more about Triac Dimming
and LM3445 LED Driver

  

Video: Watch the Arrow Electronics
evaluation of the LM3445

 

Key Features Benefit
Off-line Solution
  • Easy-to-use
  • Reduces design complexity
Angle Detector/ Decoder
  • Enables full 100:1 dimming range without flicker
Patent-Pending Control Architecture
  • Ease-of-design and smaller solution size
  • Maintains constant ripple to extend the lifetime of the LEDs
Master/Slave Control
  • Allows for single TRIAC control of multiple strings of LEDs to provide uniform dimming
  • Allows for easy retro-fit into existing lighting systems

 

LM3445 TRIAC Dimmer LED Driver Tools and Resources

 

WHAT'S NEW
LED Driver Products
  • LM3421Q/23Q
    N-Channel Controllers for Constant Current LED Drivers
  • Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs
  • High Efficiency, Multi Display LED Driver with 128 Exponential Dimming Steps and Integrated OLED Power Supply in a 1.2mm × 1.6mm µSMD Package
  • N-Channel Controller for Constant Current LED Drivers
  • 1.2A Dual Flash LED Driver System with I2C Compatible Interface
  • PFET Buck Controller for High Power LED Drives
  • 525kHz/1.6MHz, Constant Current Boost and SEPIC LED Driver with Internal Compensation
  • Triac Dimmable Offline LED Driver Provides Full Range, Flicker Free Dimming

 

LED Application Notes
  • AN-1935 - LM3445 Off-Line TRIAC Dimmer LED Driver Demo Board
  • AN-1523 - LP5521 Power Efficiency Considerations
  • AN-1562 - LP5521 Programming Considerations
  • AN-1629 - Thermal Performance of the LM3404/04HV in SO-8 and PSOP-8 Packages
  • AN-1632 - LP5521 Evaluation Kit
  • AN-1644 - Powering and Dimming High-Brightness LEDs with the LM3405 Constant-Current Buck Regulator
  • AN-1679 - LED Backlighting Solution with LM3430 and LM3432
  • AN-1764 - LM3431 Evaluation Board
  • AN-1793 - LM3433 4A to 20A LED Driver Evaluation Board
  • AN-1839 - LM3402/LM3404 Fast Dimming and True Constant LED Current Evaluation Board
  • AN-1853 - COT Drivers Control LED Ripple Current

 

LED Reference Designs
  • RD-173 - Nuventix SynJet MR16 & PAR20, PAR25, PAR30, PAR38 LED Bulb Replacement
  • RD-172 - Off-Line TRIAC Dimmer LED Driver Reference Design
  • LM3402HV - LED Reference Design - 12 InGaP LEDs, 360 mA
  • RD-148 - LM3405A Reference Design for MR16 LED Bulb, 600mA

See all LED Reference Designs.

LED Driver Video


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