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Dual-Channel CCFL Controller

Low Component Count, Feature-Rich, Automotive Inverter Solution

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Dual-Channel CCFL Controllers for Backlighting LCD Panels and Instrument Clusters in Navigation/Infotainment Applications
  • Minimal External Components Required
  • I²C Interface
  • Per-Channel Lamp-Fault Monitoring for Lamp-Open, Lamp-Overcurrent, Failure to Strike, and Overvoltage Conditions
  • Status Register Reports Fault Conditions
  • Accurate (±5%) Independent On-Board Oscillators for Lamp Frequency (40kHz to 100kHz) and DPWM Burst-Dimming Frequency (22.5Hz to 440Hz)
  • Lamp and DPWM Frequencies can be Synchronized with External Sources to Reduce Visual LCD Artifacts in Video Applications
  • Optional Spread-Spectrum Lamp Clock Reduces EMI
  • Lamp Frequency can be Stepped Up or Down to Move EMI Spurs Out of Band
  • Lamp Current Overdrive Mode with Automatic Turn-Off Quickly Warms Lamp in Cold Temperatures
  • Analog and Digital Brightness Control
  • 300:1 Dimming Range Possible Using the Digital Brightness Control Option
  • Programmable Soft-Start Minimizes Audible Transformer Noise
  • On-Board Nonvolatile (NV) Memory Allows Device Customization
  • 8-Byte NV User Memory for Storage of Serial Numbers and Date Codes
  • Low-Power Standby Mode
  • 4.75V to 5.25V Single-Supply Operation
  • Temperature Range: -40°C to +105°C
  • 28-Pin TSSOP Package

Applications/Uses

  • Instrument Clusters
  • Marine and Aviation LCDs

Description

The DS3882 is a dual-channel cold-cathode fluorescent lamp (CCFL) controller for applications that provides up to 300:1 dimming. It is ideal for driving CCFLs used to backlight liquid crystal displays (LCDs) in navigation and infotainment applications and for driving CCFLs used to backlight instrument clusters. The DS3882 is also appropriate for use in marine and aviation applications.

The DS3882 features EMI suppression functionality and provides a lamp current overdrive mode for rapid lamp heating in cold weather conditions. The DS3882 supports configurations of 1 or 2 lamps with fully independent lamp control and minimal external components. Multiple DS3882 controllers can be cascaded to support applications requiring more than 2 lamps. Control of the DS3882, after initial programming setup, can be completely achieved through I²C software communication. Many DS3882 functions are also pin-controllable if software control is not desired.

Simplified Block Diagram

DS3882: Typical Operating Circuit DS3882: 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 .