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OZ968 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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OZ968 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 6 page  OZ968 06/15/00 OZ968-SF-1.5 Page 1 Copyright 1999 by O 2Micro All Rights Reserved U.S. Patent #5,619,402 SMBus Smart Inverter Controller FEATURES • 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 GENERAL DESCRIPTION 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, 150 µA in standby mode. The OZ968 is available in a 16-pin SOP pack- age. It is specified over the commercial tempera- ture range 0oC to +70oC. TYPICAL APPLICATION CIRCUIT Figure 1. Typical Application Circuit 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 FB CMP SST ADJ CNT RT CT GND NDR PDR OVP SMBC SMBD VSEQ SCP VDD OZ968 CCFL 1:40 20V 5V CONTRAST SMBDATA SMBCLCK ENABLE R10 100k D1 1N4148 C6 22p/3KV R2 120k Q1 Si4559EY/ N Q2 Si4559EY/P Q4 3904 3904 Q5 R8 10k Q3 3906 R3 3.3k R4 200k R5 10k R7 0.1ohm D2 1N4148 R9 1k C3 0.47u C2 0.1u C1 47u/ 25v C7 4.7u R6 2.2k C4 220p C5 0.1u |
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