OZ9966 데이터 시트보기 (PDF) - Unspecified
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OZ9966 Datasheet PDF : 31 Pages
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OZ9938
FEATURES
• Positive 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 lamp ignition and normal operation of CCFLs
• Open-lamp and over-voltage protection
• Soft start function
GENERAL DESCRIPTION
The OZ9938 is a high performance, cost-effective Cold Cathode Fluorescent Lamp
(CCFL) controller designed to drive large-size LCD applications requiring 2 to 6
CCFLs.
This controller converts an unregulated DC voltage into a nearly sinusoidal lamp volt-
age and current waveforms. It provides two drive signals for most power conversion
topologies, while maintaining high efficiency operation.
The OZ9938 offers a high level of integration, while maintaining flexibility and high
efficiency operation that reduces external component heating. This results in higher
reliability and longer CCFL life. The proprietary design technique provides a simple,
low-cost system solution.
APPLICATIONS
• LCD Monitor
APPLICATION DIAGRAM
OZ9928
FEATURES
• Dual CCFL inverter controller
• Synchronization for multiple ICs
• Supports differential drive
• Supports system operation frequency synchronization
• Constant operating frequency
• 180 degree phase-shift PWM dimming
• Mixed-mode dimming control
• Integrated high side N-MOSFET driver
• High drive capability
• Selectable shutdown protection mode
• User-defined ignition and shutdown delay timers
• Built-in intelligence for lamp ignition and normal operation of CCFLs
• Open-lamp and over-voltage protection
• Soft start function
GENERAL DESCRIPTION
The OZ9928 is a high performance, cost-effective, 2-channel controller designed for
large-size Cold Cathode Fluorescent Lamp (CCFL) or External Electrode Fluorescent
Lamp (EEFL) LCD TV applications.
The controller provides six drive signals and is capable of driving full-bridge and
Class-D topologies. The drive outputs are fixed phase when used for single-side or
differential drive applications. Multiple OZ9928s can be synchronized to drive numer-
ous lamps.
OZ9928 provides total system protection for differential drive and single-side drive
applications. It receives either a DC voltage and/or external Pulse Width Modulation
(PWM) signal to perform mixed-mode PWM dimming.
APPLICATIONS
• LCD TV
APPLICATION DIAGRAM
U.S. Patent #’s 6,104,146; 6,259,615; 6,396,722; 6,559,606; 6,804,129; 6,809,938; 6,856,519; 6,897,698; 6,900,993; 7,095,392;
7,120,035; 7,151,394; 7,233,117; 7,372,213; 7,394,209; 7,417,382; 7,515,445; 7,515,446; 7,777,425; and more patents pend-
ing.
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U.S. Patent #’s 6,104,146; 6,259,615; 6,396,722; 6,501,234; 6,570,344; 6,707,264; 6,781,325; 6,804,129; 6,897,698; 6,936,975;
7,075,245; 7,095,392; 7,126,289; 7,151,394; 7,190,123; 7,248,240; 7,345,431; 7,394,209; 7,417,382; 7,425,949; 7,477,024;
7,515,445; 7,515,446; 7,550,928; 7,554,273; 7,777,425; and more patents pending.
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