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FEATURES

? Constant operating frequency

? Drives positive/negative-impedance lamps

during ignition

? High drive current for external MOSFETs

? User-defined ignition time and shutdown

delay time

? Built-in intelligence for ignition and normal

operation of CCFLs

? Built-in open-lamp protection and overvoltage

protection for backlight system

? Optimized soft-start function

GENERAL DESCRIPTION

ta9687 is a high performance, cost-effective

CCFL (Cold Cathode Fluorescent Lamp)

controller designed for driving large-size Liquid

Crystal Display (LCD) applications requiring 2 to

6 CCFLs.

The controller converts unregulated DC voltages

into a nearly sinusoidal lamp voltage and current

waveforms.

The ta9687 supports full-bridge power conversion

topologies while maintaining high-efficiency

operation. The controller provides a soft-start

operation, current and voltage regulation, overvoltage

and over-current protection, high drive

capability.

The control logic provides a regulated ignition

voltage and appropriate protection features for

over-voltage or over-current conditions.

The ta9687 offers a high level of integration,

while maintaining flexibility and high-efficiency

operation that reduces external component

heating, resulting in higher reliability and longer

CCFL life. The proprietary design technique

provides a simple, low-cost system solution.