OZ9904 назначение, описание, схема включения

Микросхемы OZ9904 и OZ9904A, назначение- LED драйверы, Производитель- O2micro®

OZ9904

FEATURES OZ9904
• 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 OZ9904
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.

OZ9904A

FEATURES OZ9904A
• Drives up to 8 strings of LEDs
• Up to 350mA LED current per string
• Supports two boost converters in parallel
• 180 degree phase-shift between the two drive outputs
• Provides two sets of PWM dimming control
• Built-in 180 degree phase-shift PWM dimming control synchronization
• Supports analog dimming
• Over-voltage and over-current protection
• Supports LED open/short circuit protection
• LED fault status output

GENERAL DESCRIPTION OZ9904A
OZ9904A is a high performance LED Driver Controller optimized for large screen LED
backlight LCD TV applications.
It provides two high-voltage gate drive signals for the boost converters, with 180o
phase-shift between the two signals. The IC minimizes input and output current
ripple. It also provides a fl exible design using only one drive signal for low-power ap-
plications through pin DRVSEL.
OZ9904A supports both internal and external Pulse Width Modulation (PWM) dim-
ming interfaces for various system confi gurations or internal Low Frequency PWM
(LPWM) dimming control

Схема включения OZ9904

Схема включения OZ9904A

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