Part Number: OZ9998

Function: Eight String High Power LED Controller

Package: 24 E-TSSOP, QFN, SOP Type

Manufacturer: O2Micro

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Description

OZ9998, OZ9998A are high effi ciency, DC/DC controllers that drive up to eight (8) strings of LEDs connected in parallel confi guration, with multiple LEDs in each string connected in series. They provide eight (8) LED current sense inputs in an “OR” confi guration to improve backlight reliability. This allows the backlight to remain functioning in the event that any string (s) is damaged during normal operation. The devices support external Pulse Width Modulation (PWM) dimming control. Plus, each provides an integrated circuit to balance the current fl ow through each LED string.

Features

• OZ9998 : Up to 60mA per ISEN channel
• OZ9998A : Up to 80mA per ISEN channel
• High power DC/DC boost converter controller
• Drives up to 8 strings in parallel
• Integrated LED current balance control circuit
• User-defi ned 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

Applications:

• LCD Monitor

• LCD TV

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OZ9998 Datasheet