4-Channel Cold-Cathode Fluorescent Lamp Controller

Overview

Technical Documents

Ordering Info

Status

All versions are No Longer Available. See Ordering Information for recommended replacements.

Description

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.

Data Sheet

Download	Rev 1	(PDF, 508kB)
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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 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

Applications/Uses

LCD PC Monitors
LCD TVs

Diagram

Typical Operating Circuit

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Rev 1; 2007-05-22
This page last modified: 2010-05-21