The OZ9938DN is a high-efficiency and highly integrated dimming direct drive backlight controller IC designed by O2Micro for LCD backlighting applications. It is designed to drive LED backlights efficiently and accurately, providing stable and consistent brightness across the display.

Applications

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

Features

• High Efficiency: Designed for optimal power conversion efficiency, minimizing heat dissipation.
• Integrated Dimming Control: Incorporates PWM dimming control for accurate brightness adjustment.
• Direct Drive: Capable of directly driving LED strings, simplifying the design and reducing external component count.
• Over-Voltage Protection (OVP): Prevents damage to the LEDs and controller in case of over-voltage conditions.
• Over-Current Protection (OCP): Protects against excessive current flow, enhancing system reliability.
• Under-Voltage Lockout (UVLO): Ensures proper startup and shutdown sequences to prevent damage.
• Open/Short LED Protection: Detects and protects against open or shorted LED conditions.
• Analog and PWM Dimming Control: Supports both analog and PWM dimming methods.
• Phase Shift Control

Benefits

• Improved Display Quality: Provides stable and consistent brightness, resulting in enhanced image quality.
• Reduced Power Consumption: High efficiency operation minimizes power consumption, extending battery life in portable devices.
• Increased System Reliability: Comprehensive protection features ensure robust and reliable operation.
• Simplified Design: Integrated features reduce the need for external components, simplifying the design process and reducing board space.
• Accurate Brightness Control: PWM dimming allows for precise adjustment of brightness levels.

Additional Details

The OZ9938DN typically operates with a wide input voltage range, suiting various power supply configurations. It includes internal compensation to minimize external components and optimize transient response. It is designed for use with external MOSFETs to drive the LED backlight strings and allows for flexibility in selecting MOSFETs based on the application requirements. Further, it provides accurate current matching between LED strings.