UM10382_2 © NXP B.V. 2009. All rights reserved.
User manual Rev. 02 — 15 October 2009 3 of 14
NXP Semiconductors
UM10382
120 V dimmable charge pump demo board
1. Introduction
The UBA2028 is a high voltage power IC intended to drive and control electronically
ballasted Compact Fluorescent Lamps (CFLs). The IC includes two internal 600 V 3 Ω
Negative-channel Metal-Oxide Semiconductor (NMOS) half bridge powers. This
UBA2028 reference board is intended for 120 V dimmable charge pump lamp applications
of 20 W and below. It can dim to below 10 % of the light output. The main input voltage
range is 120 V ± 15 %, and a voltage doubler is used to make the necessary bus voltage.
2. Features
• Two internal 600 V 3 Ω NMOS half bridge powers
• Current up to 280 mA for steady state
• Adjustable preheat time
• Adjustable preheat current
• Dimmable function
• Capacitive mode protection
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