Maker : O2Micro
Part No. : OZ960

Datasheet PDF : OZ960.pdf
Cross Reference : OZ960 Cross Reference
Buy Component : OZ960 Find Stock and Price

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Product Information

www.DataSheet4U.com OZ960 Intelligent CCFL Inverter Controller FEATURES • • • • • • • • • • • Supports wide-range voltage input applications (8v to 20v) Built-in intelligence to manage ignition and normal operation of CCFLs Reduces the number of components and board size by 30% compared with conventional designs 85% efficiency vs. typical 70% efficiency of conventional designs Zero-voltage-switching full bridge topology Built-in internal open-lamp and over-voltage protections Integrated burst mode control, and wide dimming range (10% to 100%) with integrated burst mode control Supports multiple CCFL lamps Simple and reliable 2-winding transformer design Constant-frequency design eliminates interference with LCDs Low stand-by power quality waveform received, at the CCFL voltage and current. The OZ960 operates at a single, constant frequency in a phase-shift PWM mode. Intelligent open-lamp and over-voltage protections provide design flexibility so various transformer models/manufacturers may be used. The built-in burst mode control provides a wide dimming range and simplifies the application circuit designs. Both operating and burst-mode frequencies are user-programmable parameters. The single stage design results in a low cost, reliable transformer without expensive, less reliable secondary fold-back treatment. The transformer does not require a more expensive center tapped primary. The OZ960 is available in a 20-pin SSOP package. It is specified over the commercial temperature range of 0°C to +70°C, and the industrial temperature range of -40°C to +85°C. ORDERING INFORMATION OZ960S - 20-pin plastic SSOP 150mil OZ960IS - 20-pin plastic SSOP 150mil OZ960G - 20-pin plastic SOP 300mil OZ960IG - 20-pin plastic SOP 300mil OZ960D - 20-pin plastic DIP 300mil OZ960ID - 20-pin plastic DIP 300mil FUNCTIONAL BLOCK DIAGRAM Refer to the functional block diagram in Figure 2, page 3, and the Pin Description Table on page 4. A precision reference provides a reference voltage for both internal and external uses. An oscillator circuit generates a user-programmable operating frequency with an external capacitor and a timing resistor. In addition, another resistor to program striking frequency is provided. The drive circuit consists of four outputs. These are designed to achieve zero-voltage switching, fullbridge applications. An error amplifier is provided to regulate the CCFL current. The Soft-start circuit offers a gradual increase of the power to the CCFL during the ignition period. The overvoltage protection block offers a regulated striking voltage for CCFLs. The striking time is programmable simply through an external component. The open-lamp protection is integrated in the protection block. This block intelligently differentiates the striking condition and open-lamp condition. ENA circuitry enables the operation of the IC through a TTL signal interface. Wide-dimming control is achieved through the burst-mode control block. GENERAL DESCRIPTION The OZ960 is a unique, high-efficiency, Cold Cathode Fluorescent Lamp (CCFL) backlight inverter controller that is designed for wide input voltage inverter applications. Additionally, the OZ960 performs the lamp dimming function with an analog voltage or low frequency Pulse Width Modulation (PWM) control. Operating Principle: Operating in a zero-voltage switching, full-bridge configuration, the inverter circuit achieves a very high efficiency power conversion. In addition, the transformer in the OZ960 does not require any specific gap-less arrangement. The simple, low cost transformer provides designers a high degree of design flexibility in specifying transformers. Setting the switching frequency higher than the resonant frequency of a highquality-factor resonant tank circuit yields a good- 10/23/01 Copyright 2000 - 01 by O2Micro OZ960-DS-1.6 All Rights Reserved Page 1 U.S. Patent #6,259,615 www.DataSheet4U.com J1 FUSE 1A R2 5.1K 10U U1 U2 OZ960 0.047u NDR_B PDR_...

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