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

 

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:

  • Residential Lighting
  • Architectural Lighting
  • Industrial & Commercial Lighting

 


Video: Lean 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
  • 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


MY BRIEFCASE                                         Remove all from My Briefcase 
Click any "Briefcase" icon to add an item