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OZ9932 Schematic ( PDF Datasheet ) - O2Micro

Teilenummer OZ9932
Beschreibung LCD Monitor CCFL Inverter Controller
Hersteller O2Micro
Logo O2Micro Logo 




Gesamt 11 Seiten
OZ9932 Datasheet, Funktion
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/






OZ9932 Datasheet, Funktion
The OZ9932 internal LPWM dimming control
circuitry provides a wide low-frequency dimming
range. The input to Pin 7 (VSEN_DIM) is an
analog voltage of 0.2V to 2.3V that produces a
LPWM duty cycle of 10% to 100%.
The output of the LPWM signal has a duty cycle
proportional to the input dimming signal
command (VDIM). A resistive network (R1, R2
and R3) is inserted between the external
dimming input and Pin 7 to provide user flexibility
for different dimming input voltage ranges, such
as 0V to 3V or 0V to 5V.
A wide dimming range is achieved by utilizing
LPWM control method, via the low-frequency
PWM generator circuitry. OZ9932 operates in a
constant frequency mode, in which the frequency
is set by external capacitors C9 and C11
connected to CT (Pin 2). The operating and
OZ9932
LPWM frequencies are internally synchronized.
The operating frequency can also be
synchronized to the LCD monitor system by
providing an external signal to pin 2. This
eliminates any undesired interference between
the controller and LCD panel, as the interference
is usually associated with variable-frequency
design. Interference may result in a poor user
experience because of “waterfall” display
distortion and other poor display appearance.
The approximate dimming frequency (low
frequency) is internally generated and calculated
using the following equation:
fLF =
161 x103
CT [pF]
[Hz]
CONFIDENTIAL
OZ9932-DS-0.95
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