OZ9990 Ver la hoja de datos (PDF) - O2Micro International

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OZ9990

Intelligent Lighting Family Product Guide

O2Micro International 

OZ9979

FEATURES

• High frequency DC/DC boost converter controller

• Integrated power MOSFET, and LED current balance control circuit

• Drives up to 6 strings in parallel

• Supports external, internal PWM and analog dimming

• Enhanced dimming resolution

• Supports 6 equal-delay PWM dimming signals

• PWM dimming frequency synchronized with external signal

• Protection includes: MOSFET over-current, over-voltage, LED short circuit

detection, output short circuit/open diode, and thermal

• Soft start function

GENERAL DESCRIPTION

OZ9979 is a high efficiency, DC/DC controller that drives up to six strings of

LEDs connected in parallel configuration; with multiple LEDs in each string con-

nected in series. It is targeted for notebook backlight applications.

The IC provides six (6) LED current sense inputs in an “OR” configuration for

improved backlight reliability. This allows the backlight to remain functional in

the event that any string (s) is damaged during normal operation.

APPLICATIONS

• Notebook Computer

APPLICATION DIAGRAM

U.S. Patent #’s 7,498,793; 7,847,783; 8,248,439; and more patents pending.

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