OZ968 Datasheet, PDF (1/6 Pages) List of Unclassifed Manufacturers – SMBus Smart Inverter Controller

OZ968
SMBus Smart Inverter Controller
FEATURES
GENERAL DESCRIPTION
• Single-stage power conversion
• Constant frequency design eliminates inter-
ference with LCDs
• Built-in open-lamp protection and short-
circuit protection
• Reliable 2-winding transformer design elimi-
nates arcing failures and the need for fold-
back wiring
• 32-level dimming and 256-level contrast
control via SMBus
• High efficiency, 90% typical
• Supports both floating secondary and
grounded secondary designs
ORDERING INFORMATION
OZ968G - 16-pin plastic SOP
The OZ968 is a unique single-stage, high-
efficiency, CCFL backlight controller. It drives a
zero-voltage-switching circuit and provides a
near sinusoidal output voltage and current wave-
forms for a CCFL backlight. Typical operating
frequency ranges from 30KHz to 100KHz. These
advances drive the OZ968 beyond comparable
conventional inverter designs with two power
conversion stages (one operates at a variable
frequency, the other at a constant frequency).
Operating in a PWM push-pull drive, the trans-
former in an OZ968 backlight inverter requires
only one primary winding and one secondary
winding. The secondary winding requires no fold-
back treatment.
The OZ968 supports a bi-directional, two-wire
bus, data transmission protocol to control dim-
ming (32 levels) and contrast (256 levels). Sup-
ply current is 1mA in active mode, 150µA in
standby mode.
TYPICAL APPLICATION CIRCUIT
20V
SMBCLCK
SMBDATA
ENABLE
5V
CONTRAST
C3
0.47u
1 FB
C2
2 CMP
0.1u
3 SST
4 ADJ
OZ968
C5
VDD 16
0.1u
SCP 15
VSEQ 14
SMBD 13
5 CNT
SMBC 12
R2
120k
C4
220p
6 RT
7 CT
8 GND
OVP 11
R8
PDR 10
10k
NDR 9
The OZ968 is available in a 16-pin SOP pack-
age. It is specified over the commercial tempera-
ture range 0oC to +70oC.
C1
47u/
25v
R3
3.3k
Q4
3904
1:40
C6
22p/3KV
R6
2.2k
Q5
3904
R4
200k
Q3
3906
Q2
Si4559EY/P
C7
4.7u
D1
1N4148
Q1
Si4559EY/
N
R5
R7
10k
0.1ohm
R10
100k
CCFL
D2
1N4148
R9
1k
Figure 1. Typical Application Circuit
06/15/00
Copyright 1999 by O₂Micro
OZ968-SF-1.5
All Rights Reserved
Page 1
U.S. Patent #5,619,402