OZ9976 Ver la hoja de datos (PDF) - Unspecified
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componentes Descripción
Fabricante
OZ9976 Datasheet PDF : 31 Pages
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OZ9902B
FEATURES
• Constant current or voltage output
• Drives one string of high power LEDs
• Direct PWM dimming control
• Analog dimming
• Constant operation frequency
• Power MOSFET over-current protection
• Over-voltage protection
• Output to return and Output to ground short circuit protection
• Output over load protection
• Thermal protection
• LED fault status output
GENERAL DESCRIPTION
OZ9902B is a single channel high power LED driver designed for LED backlight ap-
plications used in large-size LCD TVs.
The controller supports direct Pulse Width Modulation (PWM) dimming control and
common analog dimming control for LED string forward current.
APPLICATIONS
• LCD TV
APPLICATION DIAGRAM
OZ9904
FEATURES
• Supports 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
GENERAL DESCRIPTION
The OZ9904 is a LED driver controller optimized for large screen LED backlit 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.
APPLICATIONS
• LCD TV
APPLICATION DIAGRAM
Patents pending.
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U.S. Patent #7,498,793; 7,847,783; and more patents pending.
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