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PDF ( 数据手册 , 数据表 ) OZ9994

零件编号 OZ9994
描述 (OZ99xx) Intelligent Lighting
制造商 O2Micro
LOGO O2Micro LOGO 


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OZ9994 数据手册, 描述, 功能







OZ9994 pdf, 数据表
OZ9976
FEATURES
• Offline Inverter Controller (IPB)
• Supports both fixed and variable frequency applications
• Half-bridge or push-pull topology
• Directly drives pulse transformers
• Dedicated pins for Analog and LPWM dimming
• User-defined minimum operating frequency
• User-defined striking frequency range
• Open-load, over-voltage, and under-voltage lockout protection
• User-defined striking and shutdown delay timers
• Soft start function
GENERAL DESCRIPTION
The OZ9976 is a high efficiency, Pulse Width Modulation (PWM) controller designed
for off line LCD backlight application. It achieves high efficiency power conversion
with minimal switching loss using Zero Current Switching (ZCS) technology. OZ9976
applications can operate under fixed or variable operating frequency with ZCS tech-
nology.
The minimum operating frequency can be set by either an external RC network or
operate in self-oscillating mode. The intelligent operating frequency management
circuitry extends Cold Cathode Fluorescent Lamp (CCFL) lifetime and offers design
flexibility.
APPLICATIONS
• LCD TV
APPLICATION DIAGRAM
OZ9901
FEATURES
• Integrated 3A, 0.2switching MOSFET
• Integrated VGH and VGL charge pump regulators
• Adjustable VGH Delay
• Operational amplifier for VCOM buffer
• Open-drain reset output for TCON
• 1.2MHz fixed switching frequency boost converter with soft start and adjustable
output
• Thermal protection
GENERAL DESCRIPTION
OZ9901 offers a complete power supply solution for TFT LCD panel applications. The
LCD Bias Supply Controller consists of a high performance boost converter, open
drain reset output, charge-pump regulators for VGH and VGL, operational amplifier,
input voltage detector and a logic-controlled gate-on pulse modulator. The boost con-
verter operates using current mode control, and offers fast line and load responses for
LCD bias supplies.
The integrated charge pumps provide a regulated supply for the panel gate driver ICs.
The charge-pump regulators provide a positive gate-on supply voltage (VGH) and
negative gate-off supply voltage (VGL).
The operational amplifier works as a VCOM buffer and supplies a high output current,
fast slew rate and wide bandwidth for driving capacitive loads.
APPLICATIONS
• Notebook/Netbook Computer
APPLICATION DIAGRAM
U.S. Patent #’s 6,259,615; 6,396,722; 6,570,344; 6,781,325; 6,804,129; 6,809,938; 6,856,519; 6,900,993; 6,936,975; 7,075,245;
7,120,035; 7,126,289; 7,190,123; 7,248,240; 7,345,431; 7,394,209; 7,417,382; 7,425,949; 7,515,445; 7,515,446; 7,550,928;
7,554,273; and more patents pending.
14
U.S. Patent #7,498,793; and more patents pending.
15







OZ9994 equivalent, schematic
OZ9998/98A
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-defined 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
GENERAL DESCRIPTION
OZ9998/98A are high efficiency, DC/DC controllers that drive up to eight (8) strings
of LEDs connected in parallel configuration, with multiple LEDs in each string con-
nected in series. They provide eight (8) LED current sense inputs in an “OR” configu-
ration to improve backlight reliability. This allows the backlight to remain functioning
in the event that any string (s) is damaged during normal operation.
OZ9998/98A support external Pulse Width Modulation (PWM) dimming control. Plus,
each provides an integrated circuit to balance the current flow through each LED
string.
APPLICATIONS
• LCD Monitor
• LCD TV
APPLICATION DIAGRAM
OZ9998B
FEATURES
• High power DC/DC boost converter controller
• Drives up to 4 strings in parallel, up to 160mA per string
• Integrated LED current balance control circuit
• External PWM dimming control
• Time-shift PWM phase dimming control for low audible noise
• MOSFET over-current protection
• LED short circuit and open string protection
• Thermal protection
• LED fault status output
GENERAL DESCRIPTION
OZ9998B is a high efficiency DC/DC controller that drives up to eight strings con-
nected in parallel configuration with multiple LEDs in each string connected in series.
It provides four (4) LED current sense inputs in an “OR” configuration to improve
backlight reliability. This allows the backlight to remain functioning in the event that a
string(s) is damaged during normal operation.
OZ9998B supports external Pulse Width Modulation (PWM) dimming control.
APPLICATIONS
• LCD Monitor
• LCD TV
APPLICATION DIAGRAM
U.S. Patent #7,498,793; 7,847,783; and more patents pending.
30
U.S. Patent #7,498,793; 7,847,783; and more patents pending.
31










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