DESCRIPTION

The LX1697 is a high performance CCFL controller optimized for wide input voltage range notebook display back lighting applications. Its brightness control architecture supports Intel’s DPST (Display Power Saving Technology) that adjusts the brightness as a function of video

content.

Digital Dimming duty cycle is controlled by providing either a dc voltage or a digital PWM signal to the BRITE_D pin. Burst frequency can be controlled either by the on chip burst oscillator or directly by a low frequency PWM logic signal at BRITE_D.

The LX1697 includes a built in 5.1V regulator so it can be operated directly from the battery without the need of an external 5V supply from the system. The controller’s power stage consists of direct coupled full bridge high voltage drivers for the external N-channel high side and N

channel low side power FETs.

KEY FEATURES

ƒ 7 to 25 Volts Wide Input Voltage Range

ƒ Resistor Programmable Lamp Operating Frequency within ±3% Tolerance

ƒ Resistor Programmable Burst Operating Frequency ƒ

 Support Intel^_TM DPST for System PWM input

ƒ Compatible with Microsemi’s new SMBus CCFL controllers

ƒ Fully Programmable Open Lamp and Load Fault Time Outs

ƒ On Chip Full Wave Rectifiers for Lamp Voltage and Current

ƒ Cost Effective and Low Parts Count Inverter Modules

ƒ Uses Industry Standard High Voltage Transformers

APPLICATIONS

ƒ Note Book LCD displays

 ƒTransportable Computers

ƒ Web Tablet LCD displays