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8-Channel Cold-Cathode Fluorescent Lamp Controller

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • High-Density CCFL Controller for LCD TV and PC Monitor Backlights
  • Can Be Easily Cascaded to Support More Than 8 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
  • 48-Lead TQFP (7mm x 7mm) Package

Applications/Uses

  • LCD PC Monitors
  • LCD TVs

Description

The DS3988 is an 8-channel controller for cold-cathode fluorescent lamps (CCFLs) used to backlight liquid crystal displays (LCDs) in TV and PC monitor applications. The DS3988 supports configurations of 1 to 8 lamps, and multiple DS3988 controllers can be cascaded to support applications requiring more than 8 lamps.

Simplified Block Diagram

DS3988: Typical Operating Circuit DS3988: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .