OZ9939GN PDF Datasheet – LCDM Inverter Controller

Part Number: OZ9939, OZ9939GN

Function: LCDM Inverter Controller

Package: SOIC 16 Pin Type

Manufacturer: O2Micro

Images:OZ9939GN pdf controller


The OZ9939GN is a high performance, cost-effective CCFL (Cold Cathode Fluorescent Lamp)
controller designed for driving large-size Liquid Crystal Display (LCD) applications requiring 2 to
6 CCFLs. The controller converts unregulated DC voltages into a nearly sinusoidal lamp voltage and current waveforms.

The OZ9939 provides two drive signals for most power conversion topologies while maintaining
high-efficiency operation. The PWM controller provides a soft-start operation, current and
voltage regulation, over-voltage and over-current protection, high drive capability and multiple
dimming functions (internal PWM or external PWM or analog dimming functions).

The control logic provides a regulated ignition voltage and appropriate protection features for
over-voltage or over-current conditions.

Block Diagram:

OZ9939GN datasheet pinout


• Negative PWM dimming polarity

• Constant operating frequency

• Drives positive/negative-impedance lamps during ignition

• High drive current for external MOSFETs

• User-defined ignition time and shutdown delay time

• Multiple mode dimming control

• Built-in intelligence for ignition and normal operation of CCFLs

• Built-in open-lamp protection and over-voltage protection for backlight system

• Optimized soft-start function

OZ9939GN PDF Datasheet