0Z9924_ View Datasheet(PDF) - O2Micro International

Part Name

Description

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0Z9924_

Intelligent Lighting Family Product Guide

O2Micro International 

OZ9958

FEATURES

• High frequency DC/DC power converter for LEDs

• 5V to 27V input voltage range

• Up to 600KHz switching frequency

• Drives up to 20 LEDs in series, 3 strings in parallel

• Up to 110mA per string

• Analog or external PWM dimming

• Over-voltage protection

• Over-current protection with delay timer

• Soft start

• Low standby current

GENERAL DESCRIPTION

The OZ9958 high efficiency, DC/DC controller drives a number of LEDs connected

in series/parallel configuration. It provides three LED current sense inputs in an “OR”

configuration for improved backlight reliability. This allows the backlight to remain

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

The controller can receive either an analog or external Pulse Width Modulation

(PWM) signal for the dimming control function. It provides the user with over-voltage

and over-current protection features, and a soft start feature to minimize in-rush cur-

rent during start-up.

OZ9958 provides an integrated switch that will cut off LED current flow for each

string if the IC is disabled or during the PWM dimming “OFF” period. This feature

provides minimum standby current and a wide dimming range.

APPLICATIONS

• PDVD

• Car TV

• GPS

• Color Display Backlight

APPLICATION DIAGRAM

Patent pending.

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