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PDF OZ9932 Data sheet ( Hoja de datos )
| Número de pieza | OZ9932 | |
| Descripción | LCD Monitor CCFL Inverter Controller | |
| Fabricantes | O2Micro | |
| Logotipo |  |
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OZ9932
LCD Monitor CCFL Inverter Controller
FEATURES
• Built-in intelligence to ignite positive
impedance CCFLs
• Universal panel interface
• Enhanced output drive capability
• Over 200 steps dimming control
• Low cost LCD TV inverter solution
• Constant operating frequency
• Operating frequency can be synchronized
with external signal
• Integrated synchronized PWM dimming
control with wide dimming range
• Built-in intelligence for ignition and normal
operation of CCFLs
• Built-in open-lamp protection and over-
voltage protection
• Optimized soft-start function
• Shutdown delay for input voltage brownout
• Supports multiple CCFLs
ORDERING INFORMATION
Part Number
OZ9932G
OZ9932GN
OZ9932D
OZ9932DN
Temp Range
0oC to 70oC
0oC to 70oC
0oC to 70oC
0oC to 70oC
Package
8-pin SOIC
8-pin SOIC,
Lead-Free
8-pin PDIP
8-pin PDIP,
Lead-Free
GENERAL DESCRIPTION
The patent pending OZ9932 is a cost-effective
CCFL (Cold Cathode Fluorescent Lamp) Power
Management controller designed for CCFL,
Liquid Crystal Display (LCD) applications.
The OZ9932 provides two drive signals for most
power conversion topologies, such as push-pull,
half-bridge, full-bridge or Class-D inverters while
maintaining high-efficiency operation. The
controller converts unregulated DC voltages into
nearly sinusoidal lamp voltage and current
waveforms. The highly integrated controller
encompasses current and voltage regulation,
soft-start operation, over-voltage protection and
an external enabling function while maintaining a
high-degree of design flexibility.
the controller and LCD panel. OZ9932 drives all
types of CCFLs and is able to ignite positive
impedance CCFLs. OZ9932 provides a
shutdown delay feature for input voltage
brownout condition.
The controller provides a wide dimming range by
converting an external analog control input into a
low-frequency Pulse Width Modulation (LPWM)
dimming function. The control logic provides a
regulated ignition voltage and appropriate
protection for over-voltage or over-current
conditions.
The OZ9932 offers a high level of integration,
while maintaining flexibility and high-efficiency
operation that reduces component heating. This
results in higher reliability and longer CCFL life.
The proprietary (patent pending) design
technique provides a simpler, lower-cost system
solution.
With its enhanced output drive capability,
OZ9932 is ideal for LCD monitor and LCD TV
applications.
PIN DESCRIPTION
1 ENA_SST_CMP ISEN 8
2 CT
3 GNDA
VSEN_DIM 7
VDDA 6
4 DRV2
DRV1 5
SIMPLIFIED APPLICATION
DIAGRAM
OZ9932 operates at a constant operating
frequency. The operating frequency can be
synchronized with an external signal that
eliminates any undesired interference between
10/04/04
Copyright © 2004 by O2Micro
OZ9932-DS-0.95
All Rights Reserved
Page 1
U.S. Patent #6,559,606
CONFIDENTIAL
Free Datasheet http://www.datasheet4u.com/
1 page  
FUNCTIONAL DESCRIPTION
1. Power Conversion
The power train can be selected from the
standard half-bridge, full-bridge, push-pull or
Class-D topologies to provide symmetrical drive
pulses to the tank circuit that includes the
transformer(s), output capacitors and the
CCFL/panel load, to yield quasi-sinusoidal CCFL
voltage and current waveforms. High-efficiency
operation of the OZ9932 yields lower heat
dissipation for the inverter system resulting in
higher reliability. Reference Application Circuits
for Push-Pull and Half-Bridge topologies are
illustrated in Figure 2 & 3 on pages 7 & 8.
OZ9932 controller provides a low system cost.
To illustrate the controller functions, refer to
Figures 1 2, and 3 on pages 4, 7 and 8,
respectively for the following sections. Other
topologies can be found in the OZ9RR
Application Note.
2. Enable
The OZ9932 is enabled when the voltage on Pin
1 is greater than 0.55V.
3. Soft Start (SST)
Connecting an external capacitor to Pin 1
provides the SST function. A charging current is
provided to capacitor C5. At Start-up, as
capacitor C5 charges, the voltage level controls
the gradual increase in power to the transformer.
This reduces in-rush current and provides reliable
operation to the CCFL.
4. Ignition
The ignition process requires a higher striking
frequency to strike the CCFL. The striking
frequency is approximately 1.3 times the normal
operating frequency. The striking frequency is
determined by CT (Pin 2), external capacitors C9
and C11.
OZ9932 built-in intelligence ensures successful
ignition of all types of CCFLs and is able to ignite
positive high impedance CCFLs.
5. Normal Operation
Once the CCFL is ignited and current is sensed
at Pin 8 (ISEN), the control loop regulates the
CCFL current. The operating frequency is
OZ9932
determined by the external capacitors (C9 & C11)
connected to CT (Pin 2), where the approximate
operating frequency is calculated by the following
equation.
fop =
18.0 x103
CT [pF]
[kHz]
6. Over-Voltage Protection
The control logic protects the transformer from an
abnormal high voltage at the secondary output.
Once the IC is enabled, an internal timer is
activated to provide sufficient time for CCFL
ignition (turn-on) and VSEN_DIM (pin 7) senses
the voltage at the transformer secondary. The
internal timer provides approximately 2.0
seconds, to ensure successful ignition. Within the
~2.0 second ignition period, once the voltage at
VSEN_DIM pin reaches ~3.0V, the output voltage
is regulated. Conversely, if no current is sensed
after approximately ~2.0 seconds
(open/damaged lamp), OZ9932 immediately
shuts down. Toggling the enable signal from high
to low will reinitiate IC start-up.
7. Open Lamp Protection
OZ9932 provides a shutdown delay feature if the
lamp current is not regulated. The inverter
module will remain in normal operation for ~2-3
seconds if the input voltage suddenly drops and
subsequently resumes to a normal level.
When a CCFL is removed or damaged during
normal operation, the OZ9932 shuts off the
output drives after the shutdown delay timer
expires. When the damaged lamp is replaced,
toggling the enable pin from low to high resumes
normal operation.
8. Aged CCFL Ignition
During the ignition process, the controller senses
the voltage at the CCFL. For an open-circuit
condition, the power train delivers a regulated
voltage at the CCFL for approximately two
seconds. This is to ensure that any aged, slow-
turn-on CCFL is provided with sufficient voltage
and time to ignite.
9. Dimming Control
CONFIDENTIAL
OZ9932-DS-0.95
Page 5
5 Page 
OZ9932
IMPORTANT NOTICE
No portion of O2Micro specifications/datasheets or any of its subparts may be reproduced in any form, or by
any means, without prior written permission from O2Micro.
O2Micro and its subsidiaries reserve the right to make changes to their datasheets and/or products or to
discontinue any product or service without notice, and advise customers to obtain the latest version of
relevant information to verify, before placing orders, that information being relied on is current and complete.
All products are sold subject to the terms and conditions of sale supplied at the time of order
acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability.
O2Micro warrants performance of its products to the specifications applicable at the time of sale in
accordance with O2Micro’s standard warranty. Testing and other quality control techniques are utilized to the
extent O2Micro deems necessary to support this warranty. Specific testing of all parameters of each device
is not necessarily performed, except those mandated by government requirements.
Customer acknowledges that O2Micro products are not designed, manufactured or intended for
incorporation into any systems or products intended for use in connection with life support or other
hazardous activities or environments in which the failure of the O2Micro products could lead to death, bodily
injury, or property or environmental damage (“High Risk Activities”). O2Micro hereby disclaims all warranties,
and O2Micro will have no liability to Customer or any third party, relating to the use of O2Micro products in
connection with any High Risk Activities.
Any support, assistance, recommendation or information (collectively, “Support”) that O2Micro may provide
to you (including, without limitation, regarding the design, development or debugging of your circuit board or
other application) is provided “AS IS.” O2Micro does not make, and hereby disclaims, any warranties
regarding any such Support, including, without limitation, any warranties of merchantability or fitness for a
particular purpose, and any warranty that such Support will be accurate or error free or that your circuit
board or other application will be operational or functional. O2Micro will have no liability to you under any
legal theory in connection with your use of or reliance on such Support.
COPYRIGHT © 2004, O2Micro International Limited
CONFIDENTIAL
OZ9932-DS-0.95
Page 11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet OZ9932.PDF ] | |
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