OZ962
High-Efficiency Inverter Controller
GENERAL DESCRIPTION
FEATURES
The OZ962 is a unique high-efficiency, CCFL
backlight controller. It generates symmetrical,
near sinusoidal output voltage and current
waveforms for driving a CCFL backlight. The
OZ962 operates in a single, constant frequency,
pulse-width-modulation (PWM) mode. Typical
operating frequency ranges between 30 KHz to
100 KHz, depending on the CCFL and the
transformer’s characteristics.
·
·
·
·
Single-stage power conversion, input voltage
range of 5V to 18V
Reduces the number of components and board
size by 30% compared with conventional design
Supports both floating and grounded secondary
designs
90% efficiency vs. typical 75% efficiency of
conventional designs
Internal open-lamp and short-circuit protections
Wide dimming range
Supports synchronization among multiple
inverter modules
Reliable 2-winding transformer design,
eliminates arcing problems
Constant frequency, symmetrical, sinusoidal
drive
·
·
·
Operating in a PWM push-pull manner, the
transformer in the OZ962 backlight inverter
requires only one primary winding and one
secondary winding, with the secondary winding
requiring no fold-back treatment.
·
·
The OZ962 is available in both 16-pin SOIC and
TSSOP packages. It is specified over the
o
o
commercial temperature range: 0 C to +70 C.
ORDERING INFORMATION
OZ962R - 16 lead TSSOP
OZ962G - 16-pin plastic SOP
TYPICAL APPLICATION CIRCUIT
F1
1A Fast Fuse
VDD (+12V)
ENA
+
-
C1
22u
25V
R10
100
GND
CN1
R5
10K
C7
U1
3
U2
Q2
1
16
REF
VDD
OZ962G
*
*
C8
68p
3KV
2
3
4
5
6
7
8
15
14
33T
2200T
0.22u
RT
CT
OVP
4
2
R9
R1
C6 2.2u
50V
3.5W
220K 200K C9
5,6
-
NC
.01u
R7
100K
C5
+
13
12
11
10
9
SI4559EY
SCP
ADJ
FB
CLK
ENA
NDR
PDR
SST
R14
220p
7,8
R2
10K
1.0K
R6
30
C2
C3
Q1
R3
5.1K
0.1u
CMP
GND
1
330p
C4
0.1u
R8
0.5
R11
1M
R4
15K
R12
750
R13
100
Figure 1. Typical Floating Secondary Application
03/01/00
ÓCopyright 1999 by O2Micro
OZ962-SF-2.7
All Rights Reserved
Page 1
U.S. Patent #5,619,402