OZ532 Просмотр технического описания (PDF) - O2Micro International

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OZ532

Intelligent Lighting Family Product Guide

O2Micro International 

OZ9956C

FEATURES

• High frequency DC/DC power converter controller for LEDs

• Drives up to 6 strings in parallel

• Integrated LED current balance control circuit

• Integrated power MOSFET

• Up to 1.5MHz switching operation

• Supports phase-shift dimming with adaptive phase control

• External PWM dimming control

• Output over-voltage and short circuit protection

• LED over-current and short circuit protection

• Switch over-current protection

• Thermal protection

• Under-voltage protection

GENERAL DESCRIPTION

The OZ9956C is a high efficiency, DC/DC controller that drives up to six (6)

strings of LEDs in parallel configuration, with multiple LEDs in each string con-

nected in series. It is targeted for notebook/netbook applications.

It provides six (6) LED current sense inputs in an “OR” configuration for im-

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

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

OZ9956C supports an external Pulse Width Modulation (PWM) signal for the

phase-shifted dimming control function. It provides an integrated circuit to

balance the current flow through each LED string, as well as, an integrated

power MOSFET.

APPLICATIONS

• Notebook/Netbook

Computer

APPLICATION DIAGRAM

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

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