AN_UBA2024T_15 Datasheet, PDF (4/18 Pages) NXP Semiconductors – CFL applications

Philips Semiconductors
CFL applications with the UBA2024T
APPLICATION NOTE
1 INTRODUCTION
The UBA2024T is an integrated half bridge power IC, designed for use in an integrated / sealed
Compact Fluorescent Lamp (CFL) with a lamp current up to 150mA. Typical input voltages are
100-127Vac and 220-240Vac. Output power varies from 3 to 15W, depending on lamp and input
voltage.
The UBA2024T is a high voltage (550V) monolithic integrated circuit made in the EZ-HV SOI process.
It includes both half bridge power transistors with level-shifter and drivers, boots trap circuitry, an
internal power supply, a precision oscillator and a start-up frequency sweep function for soft-start
and/or pre-heating. It is mounted in a dedicated SO14 (Small Outline) package with optimised heat
transfer.
Due to the high level of integration, only few external components are needed when building a lamp
ballast with the UBA2024T. This application note will give descriptions of typical integrated CFL
applications in the 3 to 15W range.
(See datasheet for functional description of the UBA2024T)
2 FEATURES
• based upon EZ-HV SOI (silicon on insulator) technology
• integrated half bridge power-IC for CFL applications (both powers and controller)
• accurate oscillator with adjustable frequency
• Soft start by frequency sweep down from start frequency
• Quasi preheat option (by use of larger sweep down timing)
• Allows for very compact integrated lamp ballast which fits a small shell
• Low cost Compact Fluorescent Lamp applications due to low component count
• Easy applicable
• Can withstand 550V maximum voltage surge
4