4-Channel Cold-Cathode Fluorescent Lamp Controller

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Part Details
  • High-Density CCFL Controller for LCD TV and PC Monitor Backlights
  • Can Be Easily Cascaded to Support More Than 4 Lamps
  • Minimal External Components
  • Analog Brightness Control
  • Per-Channel Lamp Control Ensures Equal Brightness Among Lamps and Maximizes Lamp Life
  • Gate Driver Phasing Minimizes DC Supply Current Surges
  • Per-Channel Lamp Fault Monitoring for Lamp Open, Lamp Overcurrent, Failure to Strike, and Overvoltage Conditions
  • Accurate (±5%) Independent On-Board Oscillators for Lamp Frequency (40kHz to 80kHz) and DPWM Burst Dimming Frequency (22.5Hz to 440Hz)
  • Can Be Synchronized to External Sources for the Lamp and DPWM Frequencies
  • < 10% to 100% Dimming Range
  • Programmable Soft-Start Minimizes Audible Transformer Noise
  • I²C-Compatible Serial Port and On-Board Nonvolatile (NV) Memory Allow Device Customization
  • 8-Byte NV User Memory for Storage of Serial Numbers and Date Codes
  • 4.5V to 5.5V Single-Supply Operation
  • -40°C to +85°C Temperature Range
  • 32-Lead TQFP (7mm x 7mm) Package or 28-Pin SO (300 mils) Package
Additional Details
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The DS3984 is a 4-channel controller for cold-cathode fluorescent lamps (CCFLs) used to backlight liquid crystal displays (LCDs) in TV and PC monitor applications. The DS3984 supports configurations of 1 to 4 lamps, and multiple DS3984 controllers can be cascaded to support applications requiring more than 4 lamps.


  • LCD PC Monitors
  • LCD TVs

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