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NXP Semiconductors |
UBA2074(A)
High Voltage Full-bridge control IC for CCFL backlighting
Rev. 02.0 — February 2007
Preliminary data sheet
1. General description
The UBA2074 is a high 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 UBA2074 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.
Multiple inverters can be synchronized to a single operating frequency, while maintaining
constant lamp current. Also, PWM dimming can be synchronized by either using the
internal PWM generator, or by using an externally applied PWM signal.
The UBA2074 is designed to operate in a very wide inverter supply voltage range. The IC
can be configured to be supplied directly from a low voltage supply up to 30 V DC. The
fullbridge voltage can range up to 550V.
The A-version has no hardswitching protection in order to suit medium voltage (e.g 60V)
full bridge systems.
2. Features
Suitable for operating in a very wide inverter supply voltage range (up to 550 V DC for
SO28 package, up to 225 V for SSOP28 package)
Wide IC supply voltage range (9 V to 30 V DC)
Suitable for synchronizing multiple inverters to a single operating frequency with equal
lamp current phase
Adjustable maximum fault timing
Integrated level-shifters
Integrated bootstrap diodes
Lamp current control
Over-voltage control
Over-current protection
Ignition failure detection
Hard-switching control (not in the A-version)
Arcing detection
Brightness level adjustment through PWM dimming
Integrated PWM generator
Free Datasheet http://www.datasheet4u.net/
NXP Semiconductors
UBA2074(A)
High Voltage Full-bridge control IC for CCFL backlighting
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).
4. Ordering information
Table 1: Ordering information
Type number Package
UBA2074T
UBA2074TS
Name
SO28
SSOP28
Description
plastic small outline package; 28 leads; body
width 7.5 mm
plastic shrink small outline package; 28 leads;
body width 5.3 mm
UBA2074AT
SO28
UBA2074ATS SSOP28
plastic small outline package; 28 leads; body
width 7.5 mm
plastic shrink small outline package; 28 leads;
body width 5.3 mm
Version
SOT136-1
SOT341-1
SOT136-1
SOT341-1
UBA2074(A)
Preliminary data sheet
Rev. 02.0 — February 2007
© NXP B.V. 2007. All rights reserved.
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Free Datasheet http://www.datasheet4u.net/
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