SMBus Smart Inverter Controller Single-stage power conversion Con
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OZ968
SMBus Smart Inverter Controller
Single-stage power conversion Constant frequency design eliminates interference with LCDs Built-in open-lamp protection shortcircuit protection Reliable 2-winding transformer design eliminates arcing failures need foldback wiring 32-level dimming 256-level contrast control SMBus High efficiency, typical Supports both floating secondary grounded secondary designs
GENERAL DESCRIPTION
OZ968 unique single-stage, highefficiency, CCFL backlight controller. drives zero-voltage-switching circuit provides near sinusoidal output voltage current waveforms CCFL backlight. Typical operating frequency ranges from 30KHz 100KHz. These advances drive OZ968 beyond comparable conventional inverter designs with power conversion stages (one operates variable frequency, other constant frequency). Operating push-pull drive, transformer OZ968 backlight inverter requires only primary winding secondary winding. secondary winding requires foldback treatment. OZ968 supports bi-directional, two-wire bus, data transmission protocol control dimming levels) contrast (256 levels). Supply current active mode, 150µA standby mode. OZ968 available 16-pin package. specified over commercial temperature range +70oC.
ORDERING INFORMATION
OZ968G 16-pin plastic
TYPICAL APPLICATION CIRCUIT
SMBCLCK SMBDATA ENABLE CONTRAST OZ968
1:40 0.1u 22p/3KV 3904 CCFL Si4559EY/P 47u/
3.3k
0.1u
0.47u
VSEQ
SMBD
2.2k 200k
3906
1N4148 1N4148
SMBC
4.7u
Si4559EY/
120k 220p
3904
0.1ohm
100k
Figure Typical Application Circuit
06/15/00 Copyright 1999 O2Micro
OZ968-SF-1.5 Rights Reserved
Page U.S. Patent #5,619,402
OZ968
FUNCTIONAL BLOCK DIAGRAM
IBIAS
clki ramp
Reset Comparator reset
Break Before Make
160K
lcd_susp csusp
Brightness Contrast
Slow Start
poff
P.8, Section
pofbr
Protections
pofcnt
0.5V
bsusp
SMBC SMBD VSEQ
5bit data
8bit data
xolp_ok xscp_ok
INTERFACE
CLAMP
Figure Functional Block Diagram
OZ968-SF-1.5
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OZ968
CONFIGURATION
Name Description Current sense feedback. Compensation current sense feedback. Soft start steps. Two-interval current sources 50µA 0.6µA provide 1:26.6 ratio between time intervals soft start. Connect capacitor between this ground adjust soft-start timing. output brightness converter. brightness adjustable levels. default range between 0.9V 2.5V. output contrast converter. contrast levels from 0.8V (8mV step). This output current capability 2mA. Timing resistor. Timing capacitor. clock frequency. 1.60 CT). Ground. Gate drive output N-MOSFET. Gate drive output P-MOSFET. Over-voltage protection sense input. SMBus Clock Input/Output SMBus Data Input/Output. power sequence input. Short-circuit protection sense input. Supply voltage input.
SMBC SMBD VSEQ
ABSOLUTE MAXIMUM RATINGS
Storage temp. Operating temp. Operating junction temp. Logic inputs -0.3 VDD+0.3
RECOMMENDED OPERATING RANGE
Fosc 4.75 5.25
OZ968-SF-1.5
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OZ968
FUNCTIONAL SPECIFICATIONS
Parameter Oscillator Initial accuracy Temp. stability Line regulation Error Amplifier Bias current Input offset voltage Open loop voltage gain Unity gain bandwidth Dimming Output (ADJ floating) Maximum level Minimum level Power-on reset default Settling time output levels Contrast Output Maximum level Minimum level Power-on reset default Settling time Maximum output current Load regulation output levels Under-voltage Lockout Power-on Voltage Hysteresis Break-before-Make Delay (between PDR) Supply Supply current Standby Mode Supply current Active Mode Output (NDR PDR) Output high voltage Output voltage Output resistance 5.0V 5.0V 5.0V 4.75 0.25 100KHz, 800pF loading 100KHz, 800pF loading 2.70 0.75 0.75 2.80 0.80 0.80 2.95 0.90 0.90 2.40 2.40 2.50 2.65 2.65 270pF, 100k 70oC <5.5V ppm/ Test Conditions =25, Test Circuit Limits Unit
mV/mA
OZ968-SF-1.5
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OZ968
TWO-WIRE REGISTER DESCRIPTION
following register describes SMBus interface between SMBus Host OZ968
Register
Write commands. Function Contrast Brightness Slave Address (7-bit) 0101 0101 Register Index (Hex) Data byte byte
Contrast (A9)
SMBus Protocol: Read Write Byte Input/Output: Byte flags mapped follows: Name D7-D0 Default 0000 0000 Description Bits D7-D0 contain contrast level setting. When D7-D0 OZ968 outputs 2.8V. When D7D0 outputs 0.8V.
Brightness (AA)
SMBus Protocol: Read Write Byte Input/Output: Byte flags mapped follows: Name D7-D0 Default 0000 0000 Description Bits D7-D0 contain brightness level setting. When D7D0 OZ968 inverter outputs miniimum brightness. When D7-D0 OZ968 inverter outputs maximum brightness.
OZ968-SF-1.5
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OZ968
PACKAGE INFORMATION
INCHES 0.0532 0.0688 0.0040 0.0098 0.013 0.020 0.0075 0.0098 0.3859 0.3937 0.1497 0.1574 0.050 BCS. 0.2284 0.2440 0.016 0.050 MILLIMETERS 1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 9.80 10.00 3.80 4.00 1.27 BCS. 5.80 6.20 0.40 1.27
SOP-16 PACKAGE
OZ968-SF-1.5
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