OZ8023 Просмотр технического описания (PDF) - O2Micro International

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Компоненты Описание

производитель

OZ8023

Intelligent Lighting Family Product Guide

O2Micro International 

OZ9998/9998A

FEATURES

• High power DC/DC boost converter controller

• Drives up to 8 strings in parallel

• Integrated LED current balance control circuit

• User-defined string selection

• External PWM dimming control

• Time-shift PWM phase dimming control for low audible noise

• Multi-chip parallel operation for more than 8 LED strings

• MOSFET over-current protection

• LED short circuit and open string protection

• Thermal protection

• LED fault status output

GENERAL DESCRIPTION

OZ9998/98A are high efficiency, DC/DC controllers that drive up to eight (8)

strings of LEDs connected in parallel configuration, with multiple LEDs in each

string connected in series. Each IC provides eight (8) LED current sense inputs

in an “OR” configuration to improve backlight reliability. This allows the back-

light to remain functional in the event that any string (s) is damaged during

normal operation.

OZ9998/98A support external Pulse Width Modulation (PWM) dimming control.

Plus, each provides an integrated circuit to balance the current flow through

each LED string.

APPLICATIONS

• LCD Monitor

• LCD TV

APPLICATION DIAGRAM

U.S. Patent #’s 7,498,793; 7,847,783; and more patents pending.

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