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OZ968G

ETC
Part Number OZ968G
Manufacturer ETC
Description SMBus Smart Inverter Controller
Published May 13, 2005
Detailed Description OZ968 SMBus Smart Inverter Controller FEATURES • • • • • • • Single-stage power conversion Constant frequency design eli...
Datasheet PDF File OZ968G PDF File

OZ968G
OZ968G

Overview
OZ968 SMBus Smart Inverter Controller FEATURES • • • • • • • Single-stage power conversion Constant frequency design eliminates interference with LCDs Built-in open-lamp protection and shortcircuit protection Reliable 2-winding transformer design eliminates arcing failures and the need for foldback wiring 32-level dimming and 256-level contrast control via SMBus High efficiency, 90% typical Supports both floating secondary and grounded secondary designs GENERAL DESCRIPTION The OZ968 is a unique single-stage, highefficiency, CCFL backlight controller.
It drives a zero-voltage-switching circuit and provides a near sinusoidal output voltage and current waveforms 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 transformer in an OZ968 backlight inverter requires only one primary winding and one secondary winding.
The secondary winding requires no foldback treatment.
The OZ968 supports a bi-directional, two-wire bus, data transmission protocol to control dimming (32 levels) and contrast (256 levels).
Supply current is 1mA in active mode, 150µA in standby mode.
The OZ968 is available in a 16-pin SOP package.
It is specified over the commercial temperature range 0oC to +70oC.
ORDERING INFORMATION OZ968G - 16-pin plastic SOP TYPICAL APPLICATION CIRCUIT 20V SMBCLCK SMBDATA ENABLE 5V CONTRAST OZ968 C5 1:40 C6 0.
1u 22p/3KV Q4 3904 CCFL Q2 Si4559EY/P D1 C1 47u/ 25v 1 C2 FB VDD 16 R3 3.
3k 2 0.
1u CMP SCP 15 C3 0.
47u 3 SST VSEQ 14 4 ADJ SMBD 13 R6 2.
2k R4 200k Q3 3906 C7 1N4148 D2 1N4148 5 CNT SMBC 12 4.
7u 6 RT OVP 11 R8 Q1 Si4559EY/ N 7 R2 120k C4 220p CT PDR 10 10k Q5 3904 R5 10k R7 0.
1ohm R10 100k R9 1k 8 GND NDR 9 Figure 1.
Typical Application Circuit 06/15/00 Copyright 1999 ...


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