DS3984T+

Rev 1; 5/07 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 ♦ 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 LCD Televisions LCD PC Monitors Ordering Information PART Features TEMP RANGE PIN-PACKAGE DS3984T -40°C to +85°C 32 TQFP DS3984T+ -40°C to +85°C 32 TQFP DS3984Z -40°C to +85°C 28 SO.300 DS3984Z+ -40°C to +85°C 28 SO.300 +Denotes a lead-free package. Pin Configurations ♦ 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 ♦