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#126: Dimming Techniques for Switched-Mode LED Drivers

Overview: The exponential growth of LED lighting has ushered in a vast selection of integrated circuit devices to provide controlled power to LEDs. No longer acceptable to an energy-conscious world, switched-mode LED drivers have long since replaced power-hungry linear current sources as the standard. Applications from flashlights to stadium scoreboards all require precise control of regulated currents. In many instances, real-time changes in LED output intensity are required. This function is commonly referred to as dimming control. This article describes some basic LED theory and several techniques used to provide dimming control to switched-mode LED drivers.

  

Power Designer
Published every other month, Power Designer's feature articles cover power design techniques.

 

Publication PDF
#126: Dimming Techniques for Switched-Mode LED Drivers 387KB
#125: Improve Power Converter Reliability Using Hiccup-Mode Current Limiting 446KB
#124: Isolated Supply Overview and Design Trade-Offs 685KB
#123: Voltage Reference Selection Basics 297KB
#122: Optimizing Power Controller Designs through Effective Utilization of Performance Features 329KB
#121: Power Supply Design Considerations for Modern FPGAs 390KB
#120: Calculating Losses and Junction Temperature for High-Power-Density Switching Converters 341KB
#119: Color-Management LED Drivers Have a Bright Future 478KB
#118: Saving Energy via Smart Power Management 389KB
#117: Overcoming Challenges in Designing Step-Down Regulator Applications with ≥40V Input Voltage 535KB
#116: Driving LEDs: To Cap or Not to Cap

507KB
#115: Implementing Single-Chip FPGA Power Solutions 470KB
#114: Best Layout Practices for Switching Power Supplies 476KB
#113: Optimizing Efficiency in White LED Backlight Applications 537KB
#112: Synchronous Rectification in High–Performance Power Converter Design 527KB
#111: Buck Regulator Topologies for Wide Input/Output Voltage Differentials 1.0MB
#110: Optimizing RF Power Amplifier System Efficiency Using DC-DC Converters 530KB
#109: Advanced Topics in Powering FPGAs 1.1MB
#108: Operation and Benefits of Active-Clamp Forward Power Converters 503KB
#107: Analyzing Power Modules 2.3MB
#106: Inside Current-Mode Control 376KB
#105: Power Management Design for Applications Processors 1.3MB
#104: Power Supply Design for Power-over-Ethernet Applications 1.8MB
#103: Understanding Portable Applications Requirements 429KB
#102: Power Management Considerations for FPGAs and ASICs 711KB
#101: Feedback Techniques for Crossing the Isolation Boundary 490KB


Also see Signal Path Designer for expert tips, tricks, and techniques for designers of signal-path applications.

 
WHAT'S NEW
Power Products
  • Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs
  • 75V Constant On-Time PFET Buck Switching Controller
  • 42V Constant On-Time PFET Buck Switching Controller
  • Voltage Mode Active Clamp Controller
  • High Efficiency, Multi Display LED Driver with 128 Exponential Dimming Steps & Integrated OLED Power Supply in 1.2mm × 1.6mm µSMD Package
  • Dual Synchronous Emulated Current-Mode Controller
  • N-Channel Controller for Constant Current LED Drivers
  • LM25037Q - Dual-Mode PWM Controller With Alternating Outputs
  • 1.2A Dual Flash LED Driver System with I2C Compatible Interface
  • PowerWise AVS Energy Management Unit with SPMI

See all new power solutions.

 

 

Power Application Notes
  • AN-1696 Designing a Boost LED Driver Using the LM5022
  • AN-1736 LM3433 HB LED Driver Evaluation Kit
  • AN-1774 LM3410X LED Driver 6-Pin LLP Demo Board
  • AN-1775 LM3410X SEPIC 6-Pin LLP Demo Board
Power Evaluation Boards
  • LM3410XMFLEDEV - $37.50 Description: LM3410 Boost will SOT23 Package evaluation board
  • LM3410XSDLEDEV - $37.50 Description: LM3410 Boost with LLP Package evaluation board
  • LM5035AEVAL - $160.00 Description: Evaluation Board for the PWM Controller with Integrated Half-Bridge and SyncFET Drivers
  • LM3881EVAL - $30.00 Description: Evaluation Board for the LM3881 Power Sequencer
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