NXP half-bridge power IC
UBA2024/A for CFL lamps
Fully integrated CFL solution
for lamps up to 25 W
Designed for standard Compact Fluorescent Lamp (CFL) applications, the UBA2024 and the
pin-for-pin compatible UBA2024 save space, increase efficiency and extend burner lifetime.
Supported by a variety of design tools, they’re especially easy to design in.
Key features
} Complete CFL solution for 15 W (UBA2024) and 25 W
(UBA2024A)
} Maximum voltage: 550 V
} Integrated 9 Ω (UBA2024) or 6/6.4 Ω (UBA2024A) switches
} Integrated bootstrap diode and self-supplying circuitry
} Only 17 external components required including EMI filter
and fusistor
} Glow phase (NXP patent)
} Adjustable operating frequency
} Compact DIP8 and SO14 packages
UBA2024
The NXP UBA2024 is a 550 V lamp controller and half-bridge
IC equipped with 9 Ω switches. It supports standard CFL
applications up to 15 W and is available in a small DIP8 or SO14
package.
Key benefits
} Small form factor and increased reliability
} Maximum light output in shortest time
} Easy to match with each burner (up to 25 W)
The IC includes a soft-start function, an adjustable internal
oscillator, and an internal drive function that has a high-voltage
level shifter for driving the half bridge. To guarantee an
accurate 50% duty cycle, the oscillator signal is passed through
a divider before being fed to the output drivers.
Applications
} Indoor CFL applications
The high level of integration reduces the number of external
components to only 17 (compared to the 27 typically required
by a discrete driver solution). The IC supports NXP’s patented
glow phase, and as a result delivers maximum light in the least
amount of time.
The UBA2024 is available in a demo board for 120 and 230
VAC and is supplied with a calculation tool that lets the
engineer fine-tune the board to a given burner specification.
UBA2024A
The UBA2024A is a pin-compatible variant of the UBA2024.
It extends the application range to include systems up to
25 W. In the DIP8 package, it integrates 6 Ω switches, and in
the SO14 package, it has 6.4 Ω switches. It enables a single
PCB layout with multiple power levels, and reduces switching
losses with up to a 5-6% improvement in efficiency. When
compared to a discrete driver, the UBA2024A delivers a lower
P tot with the same Plamp, higher efficiency, and lower loss.
UBA2024 block diagram
1.8 mH
LFILT
AC mains
supply
(230 V)
RFUS
D1
D2
CBUF
4.7 uF
33
D3
D4
CHB2
47 nF
max. 550 V
HV
11 W/150 mA
FS
CFS
10 nF
OUT
3.1 mH
CHB1
47 nF
CLA
1.5 nF
LLA
CDV
100 pF
PGND
6
1
3
7
5
8
SW
VDD
RC
UBA2024P
4
2
SGND
ROSC
110 K
COSC
180 pF
CVDD
10 nF
CSW
33 nF
mdb033
UBA2024/A selection guide
Type
Package
Rdson (Ω)
Isat (mA)
UBA2024P
DIP8
9.0
900
UBA2024T
SO14
9.0
900
UBA2024AP
DIP8
6.0
1350
UBA2024AT
SO14
6.4
1200
www.nxp.com
© 2009 NXP B.V.
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
Date of release: September 2009
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and
Document order number : 9397 750 16791
reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.
Printed in the Netherlands
Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.