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A-4.) Inverter Circuit Operation Theory
An Intelligent CCFL Inverter Controller --- TL1451
The TL1451 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 TL1451 provides two drive signals for most power conversion topologies while
maintaining high-efficiency operation. The PWM controller provides a soft-start operation,
current and voltage regulation, over-voltage and over-current protection, high drive
capability and multiple dimming functions (internal PWM or external PWM or analog
dimming functions).
The controller converts unregulated DC voltages into a nearly sinusoidal lamp voltage
and current waveforms.
The control logic provides a regulated ignition voltage and appropriate protection features
for over-voltage or over-current conditions. The TL1451 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.
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