DS3994

www.DataSheet4U.com Rev 0; 10/06 4-Channel Cold-Cathode Fluorescent Lamp Controller General Description The DS3994 is a 4-channel controller for cold-cathode fluorescent lamps (CCFLs) that backlight liquid crystal displays (LCDs) in TV and PC monitor applications. The DS3994’s features make it suitable for use in even the largest LCDs, while its low BOM cost makes it ideal for the entire range of LCD TVs and monitors. The DS3994 can stagger the lamp bursts from each of the four channels. This feature allows scanning backlight schemes for video quality improvement to be implemented using a single CCFL controller IC, making it very simple and inexpensive to provide this enhancement. In addition, staggering the bursts from each channel can be used to minimize current ripple on the display power supply, which is especially important for larger LCDs. The relative stagger between each of the channels is programmable, so this feature can be tailored to the specific application. The DS3994 uses a push-pull drive architecture but it can also support full and half bridge drive schemes. Contact the factory for more details. Features o High-Density CCFL Controller for LCD TV and PC Monitor Backlights o Programmable Staggered Start for Burst Dimming on Each Channel o Strike Frequency Boost Option o Programmable Strike Time o Can Be Easily Cascaded o Minimal External Components o Analog Brightness Control o Gate Driver Phasing Minimizes DC Supply Current Surges o Per-Channel Lamp Fault ...