1.

General description

The UBA2072 is a low voltage IC intended to drive Cold Cathode Fluorescent Lamps

(CCFLs) for back-lighting applications. The IC contains level-shifters, bootstrap diodes

and drivers for the external full-bridge power switches.

Furthermore, the UBA2072 has a build-in HF oscillator which determines the operating

frequency, a phase shift controller for obtaining constant lamp current, and a PWM

generator which is used to set the brightness level of the CCFLs.

The UBA2072 is designed to operate over a wide low voltage inverter supply range, up to

30V. The IC can be supplied directly from the inverter supply.

2.

Features

Wide supply voltage range (9 V to 30 V DC)

Adjustable maximum fault timing

Integrated level-shifters

Integrated bootstrap diodes

Lamp current control

Over-voltage control

Over-current protection

Ignition failure detection

Arcing detection

Brightness level adjustment through PWM dimming

Integrated PWM generator

3.

Applications

LCD-backlighting, including LCD-TV and LCD-Monitor applications. The IC is intended

to drive and control a full-bridge inverter with resonant load circuit for CCFLs, but can

also drive an array of External Electrode Fluorescent Lamps (EEFLs).

UBA2072

Low Voltage Full-bridge control IC for CCFL backlighting

Rev. 08.0 — February 2007

Preliminary data sheet