Founded in April 1995, O2 Micro (NASDAQ: OIIM) is dedicated to the design, development and sale of power management systems for communications, computers, consumer electronics, industrial and automotive applications. O2 Micro has the world's leading power management system architecture, rapid market response, strong customer relationships and strong digital-analog hybrid design capabilities. O2 Micro has an experienced design and management team in the industry, branches around the world and many years of successful performance. All of the company's chips are produced in world-renowned chip manufacturers. O2 Micro attaches great importance to the development and protection of intellectual property rights, and has a wide range of international invention patents in chips and application fields, as well as numerous registered trademarks and other intellectual property rights. O2 Micro's customers include the world's leading manufacturers in the fields of communications, computers, consumer electronics, industrial and automotive.
Quality Policy: O2 Micro has established, promoted, and implemented the following quality policy to promote and support the goals of the quality system. O2 Micro is committed to providing customers with power management solutions that achieve customer satisfaction by: designing high-quality products to achieve maximum system compatibility, delivering products on time every time, and promoting quality system improvements based on measured performance. Quality Mission Statement It is the continuous improvement in the process. We achieve the goal of improving customer satisfaction by meeting or exceeding user requirements, while making it easier for customers to do business with us.
Environmental Policy: O2 Micro is committed to preventing pollution and continuously improving the Environmental Management System (EMS). O2 Micro will develop environmentally safe technologies, including but not limited to: reducing power consumption worldwide through designing power-saving devices, reducing the use of toxic and hazardous substances in product materials and manufacturing processes, and we are committed to becoming a responsible and sustainable global organization in compliance with applicable laws and other requirements worldwide. From design, procurement, manufacturing to distribution, we will operate and manage all aspects of our business in a manner that promotes an earth-friendly environment.
OZ9904 Four String LED Controller
Features
LED Backlight Controller ICs for TV APPLICATIONS
The OZ9904 is a LED driver controller optimized for large screen LED backlight LCD TV applications. It provides an integrated four-channel LED current control circuit. In application, it controls external balance transistors to maintain the current balance among LED strings.
OZ9904 supports both internal and external Pulse Width Modulation (PWM)dimming methods for brightness control of LCDs for various system applications. The internal PWM dimming signal can also be synchronized with the vertical sync signal of the LCD display.
The IC further supports an analog dimming control function, which adjusts the LED current amplitude of all the four ISEN channels simultaneously.
Parameters
• Supports up to 4 strings
• Up to 355mA LED current per string
• Supports external and internal PWM dimming control
• Supports analog dimming
• Over-voltage and over-current protections in applications
• Supports LED open/short circuit protections in applications
• LED fault status output
• package SOP28, SSOP28
Application
• LCD TV
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