OZ9902 схема включения, описание

Микросхемы OZ9902 и OZ9902B, Производитель- O2micro®

Назначение- LED драйверы

OZ9902

FEATURES OZ9902
• Dual Channel DC/DC converter
• Constant current or voltage output
• Drives one string of high power LEDs per channel
• 180 degrees phase-shift between the two driver outputs
• Independent PWM dimming control for each channel
• Analog dimming
• Constant operation frequency
• Operation frequency synchronization
• Power MOSFET over-current protection
• Over-voltage protection
• Output to return and Output to ground short-circuit protection
• Output over load protection
• Limited Current Condition (LCC) protection
• Thermal protection
• LED fault status output

GENERAL DESCRIPTION OZ9902
OZ9902 is a dual, high power LED driver designed to build LED backlight for large-
size LCD TV applications. It integrates two independently-controlled LED drivers to
achieve optimum effi ciency. The drive outputs are phase-shifted by 180 degrees to
minimize current ripple in high power applications.
OZ9902 supports independent Pulse Width Modulation (PWM) dimming control for
each channel and common analog dimming control for both channels. It provides
system design fl exibility for LCD TV with local dimming or 3D display mode.

OZ9902B

FEATURES OZ9902B
• 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
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.

Схема включения OZ9902

Схема включения OZ9902B

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