OZ960
Intelligent CCFL Inverter Controller
FEATURES
quality waveform received, at the CCFL voltage
and current.
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•
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Supports
applications (8v to 20v)
wide-range
voltage
input
Built-in intelligence to manage ignition and
normal operation of CCFLs
Reduces the number of components and
board size by 30% compared with
conventional designs
85% efficiency vs. typical 70% efficiency of
conventional designs
Zero-voltage-switching full bridge topology
Built-in internal open-lamp and over-voltage
protections
The OZ960 operates at a single, constant
frequency in a phase-shift PWM mode. Intelligent
open-lamp and over-voltage protections provide
design flexibility so various transformer
models/manufacturers may be used. The built-in
burst mode control provides a wide dimming
range and simplifies the application circuit
designs. Both operating and burst-mode
frequencies are user-programmable parameters.
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•
•
•
Integrated burst mode control, and wide
dimming range (10% to 100%) with
integrated burst mode control
Supports multiple CCFL lamps
Simple and reliable 2-winding transformer
design
The single stage design results in a low cost,
reliable transformer without expensive, less
reliable secondary fold-back treatment. The
transformer does not require a more expensive
center tapped primary.
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•
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Constant-frequency
interference with LCDs
Low stand-by power
design
eliminates
The OZ960 is available in a 20-pin SSOP
package. It is specified over the commercial
temperature range of 0°C to +70°C, and the
industrial temperature range of -40°C to +85°C.
ORDERING INFORMATION
FUNCTIONAL BLOCK
DIAGRAM
OZ960S - 20-pin plastic SSOP 150mil
OZ960IS - 20-pin plastic SSOP 150mil
OZ960G - 20-pin plastic SOP 300mil
OZ960IG - 20-pin plastic SOP 300mil
OZ960D - 20-pin plastic DIP 300mil
OZ960ID - 20-pin plastic DIP 300mil
Refer to the functional block diagram in Figure 2,
page 3, and the Pin Description Table on page 4.
A
precision reference provides a reference
voltage for both internal and external uses. An
oscillator circuit generates a user-programmable
operating frequency with an external capacitor
and a timing resistor. In addition, another resistor
to program striking frequency is provided. The
drive circuit consists of four outputs. These are
designed to achieve zero-voltage switching, full-
bridge applications. An error amplifier is provided
to regulate the CCFL current. The Soft-start
circuit offers a gradual increase of the power to
the CCFL during the ignition period. The over-
GENERAL DESCRIPTION
The OZ960 is a unique, high-efficiency, Cold
Cathode Fluorescent Lamp (CCFL) backlight
inverter controller that is designed for wide input
voltage inverter applications. Additionally, the
OZ960 performs the lamp dimming function with
an analog voltage or low frequency Pulse Width
Modulation (PWM) control.
Operating Principle:
voltage protection block offers
a regulated
Operating in a zero-voltage switching, full-bridge
configuration, the inverter circuit achieves a very
high efficiency power conversion. In addition, the
transformer in the OZ960 does not require any
specific gap-less arrangement. The simple, low
cost transformer provides designers a high
degree of design flexibility in specifying
transformers. Setting the switching frequency
higher than the resonant frequency of a high-
quality-factor resonant tank circuit yields a good-
striking voltage for CCFLs. The striking time is
programmable simply through an external
component. The open-lamp protection is
integrated in the protection block. This block
intelligently differentiates the striking condition
and open-lamp condition. ENA circuitry enables
the operation of the IC through a TTL signal
interface. Wide-dimming control is achieved
through the burst-mode control block.
10/23/01
Copyright 2000 - 01 by O2Micro
OZ960-DS-1.6
All Rights Reserved
Page 1
U.S. Patent #6,259,615
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