4-Channel Cold-Cathode Fluorescent Lamp Controller

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.

Applications

* LCD PC Monitors * LCD TVs

* 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