The OZ960G is a controller IC designed for driving Cold Cathode Fluorescent Lamps (CCFLs) used in LCD backlighting applications. This integrated circuit, manufactured by O2Micro, is typically found in LCD monitors and televisions, where it regulates the power supplied to the CCFLs to provide consistent and efficient backlighting. The OZ960G incorporates a number of features to optimize performance, protect the system, and extend the life of the CCFL lamps.

Applications

• LCD Monitors
• LCD TVs
• Notebook Displays
• Industrial LCD Panels

Features

• PWM Dimming Control: Offers precise brightness control of the LCD panel.
• Integrated Open Lamp Protection: Protects the inverter circuit from damage in the event of an open lamp condition.
• Overvoltage Protection: Prevents damage from excessive voltage levels.
• Overcurrent Protection: Limits current flow to prevent damage from short circuits or excessive load.
• Soft Start Function: Gradually ramps up the voltage to the CCFLs to minimize stress and extend lamp life.
• Frequency Adjustment: Allows for fine-tuning of the operating frequency to optimize inverter efficiency and lamp performance.

Benefits

• Enhanced Display Quality: Provides stable and consistent backlighting for improved image clarity and color accuracy.
• Extended Lamp Life: Incorporates features to reduce stress on the CCFL lamps, leading to a longer lifespan.
• Improved System Reliability: Protection features prevent damage from common fault conditions, ensuring reliable operation.
• Reduced Power Consumption: Optimizes energy efficiency to minimize power consumption and heat generation.
• Simplified Design: Integration of multiple functions into a single chip simplifies the design process and reduces component count.

The OZ960G operates by generating a high-frequency AC voltage to drive the CCFL lamps. It employs pulse-width modulation (PWM) to control the brightness of the lamps, allowing for a wide range of dimming levels. The integrated protection features, such as open-lamp protection, overvoltage protection, and overcurrent protection, safeguard the inverter circuit from damage in the event of a fault condition. The soft-start function gradually increases the voltage applied to the lamps during startup, minimizing stress and extending their lifespan. The device is typically used in conjunction with a transformer and other external components to form a complete CCFL backlight inverter circuit. It is available in a small outline package (SOP) suitable for compact applications.