CCFL controller for 24-volt CCFL inverter in LCD displays

Microsemi has introduced a new CCFL controller featuring mega-contrast dimming for 24-volt cold cathode fluorescent light (CCFL) inverter applications in small- to large-sized LCD displays.

LX6502 is a full-bridge controller with integrated 12V gate drivers with advantages such as improved black levels, dynamic contrast, image uniformity, reliability and protection.

Tom Kapucija, director of marketing with Microsemi's Analog Mixed Signal Group said "Following the successful adoption of our LX6503A and LX6523A PureBLACK devices in HV-LIPS solutions by top TV manufacturers, we are now excited to add this new device to our CCFL inverter controller family. The LX6502 gives LCD panel manufacturers and other OEMs yet another option for using our mega-contrast dimming technology to deliver high-end image quality with superior black levels and increased dynamic contrast."

Microsemi's LX6502 supports full-bridge, high- and low-side N-channel power MOSFET configurations with input voltages up to 35V. The other features include an integrated on-chip voltage regulator with under-voltage lockout protection, soft-start, direct duty cycle control with maximum duty limiting, and over-current and over-voltage protection.

The LX6502 offers user-programmable burst-dimming and strike-frequency control, as well as programmable strike and open-lamp protection. Also included is a synchronization (SYNC) function with selectable frequency ratio, frequency limit, auto detect, and synchronization.

The LX6502 controller integrates all necessary functionality for LCD TV or monitor displays in a single controller that also provides reliable lamp striking, comprehensive brightness control modes (including analog and pulse-width modulation burst dimming) and support for 24V inverter topologies in existing backlight applications. Microsemi claims LX6502 controller features tighter lamp current accuracy as compared to competitive solutions.

Operating temp range: -40 deg C to +85deg C
Package: 28-lead SOIC plastic package

Price: Each $0.64 in OEM quantities
Availability: April 2010