OZ9936D [ETC]
OZ9936 / LCD Monitor CCFL Inverter Controller;
| 型号： | OZ9936D |
| 厂家： | 
ETC |
| 描述： | OZ9936 / LCD Monitor CCFL Inverter Controller CD |
| 文件： | 总11页 (文件大小：181K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OZ9936
Change Summary
CHANGES
No
Applicable Section
Footer
Description
Page(s)
1
Added patent numbers
0
REVISION HISTORY
Revision
No.
Description of change
Release
Date
0.90
1.0
Initial release
09/09/04
03/09/05
Features: 1. Add ‘Built-in intelligence to ignite positive impedance
CCFLs; 2. Add ‘Shutdown delay for input brownout condition’; 3. Delete
‘Tight parameter tolerance’
General Description: 1. Add ‘OZ9936 drives all types of CCFLs and is
able to ignite positive impedance CCFLs. OZ9936 provides a shutdown
delay feature for input brownout condition.’ after ‘OZ9936 operates at a
constant…’. 2. Move the paragraph ‘The OZ9936 provides two drive…’
to the 2nd paragraph
Electrical Specifications: a. Update ‘Supply Current’ Max limits;
b. Update ‘Soft Start Current Source’ Typ & Max limits; c.
Update ‘Under Voltage Lockout’ Min, Typ & Max limits; d.
Update ‘ENA_SST_CMP Pin – Low’ Max limit; e. Update
Operating Frequency on DRV1 & DRV2 Pin’ Min, Typ & Max
limits & Temperature Coefficient; f. Update ‘Duty Cycle on DRV1
& DRV2 (active high)’ Max limit; g. Update ‘Ignition Time’ Min &
Max limits; h. Add ‘Open Lamp Shutdown Delay Time’
parameters; i. Update ‘V1(ENA_SST_CMP Pin) Threshold’ Min
limit; j. Update ‘Drivers’ Typ & Max limits; k. Update ‘Analog
Dimming Control’ Min, Typ & Max limits; l. Update ‘External
PWM Dimming Control’ Min, Typ & Max limits and add
temperature coefficient.
Functional Description: Modify No. 7. Open Lamp Protection.
Throughout data sheet: Miscellaneous corrections.
04/06/05
Copyright © 2003-2005 by O2Micro
OZ9936-DS-1.1
All Rights Reserved
CONFIDENTIAL
Page 0
U.S. Patents #6,559,606
#6,856,519
#6,809,938
#6,804,129
OZ9936
LCD Monitor CCFL Inverter Controller
FEATURES
OZ9936 operates at
a
constant operating
•
Built-in intelligence to ignite positive
impedance CCFLs
Low cost LCD monitor inverter solution
Constant operating frequency
Built-in intelligence for ignition and normal
operation of CCFLs
Built-in open-lamp protection and over-
voltage protection
Optimized soft-start function
frequency that eliminates any undesired
interference between the controller and LCD
panel. OZ9936 drives all types of CCFLs and is
able to ignite positive impedance CCFLs.
OZ9936 provides a shutdown delay feature for
input brownout condition.
•
•
•
•
The control logic provides a regulated ignition
voltage and appropriate protection for over-
voltage or over-current conditions.
•
•
Supports both analog and external PWM
dimming control
•
Shutdown delay for input brownout
condition
Higher reliability and longer CCFL life
The OZ9936 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.
•
•
•
Supports multiple CCFLs
Minimum external components
ORDERING INFORMATION
The CCFL backlight controller is designed for
low-cost LCD monitor applications. OZ9936
provides an analog dimming control where the
CCFL brightness is controlled by adjusting the
current amplitude. In addition, the IC provides a
PWM dimming function with an external PWM
signal. The controller converts unregulated DC
voltages into a nearly sinusoidal lamp voltage
and current waveforms.
Part Number
OZ9936G
Temp Range
Package
0oC to 70oC
8-pin SOIC
8-pin SOIC,
Leadfree
OZ9936GN
OZ9936IG
OZ9936IGN
OZ9936D
0oC to 70oC
-40oC to 85oC
-40oC to 85oC
0oC to 70oC
0oC to 70oC
8-pin SOIC
8-pin SOIC,
Leadfree
8-pin PDIP
8-pin PDIP,
Leadfree
PIN DIAGRAM
OZ9936DN
8
7
6
5
1
2
3
4
ISEN
DIM
ENA_SST_CMP
RT
GENERAL DESCRIPTION
The patent pending OZ9936 is a cost-effective
CCFL (Cold Cathode Fluorescent Lamp) Power
Management controller designed for driving
CCFLs in Liquid Crystal Display (LCD)
applications.
VDDA
DRV1
GNDA
DRV2
TYPICAL OPERATING
CIRCUIT
The OZ9936 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 highly
integrated controller provides current and voltage
regulation, soft-start operation, over-voltage
protection and an external enabling function while
maintaining a high-degree of design flexibility.
The application requires a minimum number of
off-the-shelf components.
04/06/05
Copyright ©2003-5 by O2Micro
OZ9936-DS-1.1
All Rights Reserved
CONFIDENTIAL
Page 1
OZ9936
PIN DESCRIPTION
Names
Pin No.
Description
ENA_SST_CMP
RT
1
2
3
4
5
6
7
8
Enable, Soft Start Time and Compensation for Current and Voltage
Timing Resistor to Provide Striking and Operating Frequency
Ground
N MOSFET Drive Output
N MOSFET Drive Output
Supply Voltage
Dimming Voltage Adjust Input
Current Sense Feedback
GNDA
DRV2
DRV1
VDDA
DIM
ISEN
ABSOLUTE MAXIMUM RATINGS(1)
Input Voltage VDDA
GNDA
7.0V
+/- 0.3V
Signal Inputs
-0.3V to VDDA +0.3V
OZ9936
0oC to +70oC
OZ9936I
-40oC to +85oC
Operating Temp.
Operating Junction Temp.
Storage Temp.
125oC
-55oC to 150oC
RECOMMENDED OPERATING RANGE
VDDA - Input Voltage
4.5V to 5.5V
30KHz to 150KHz
fop - Operating Frequency
Thermal Impedance (θJ-A
)
74oC/W
-
8-pin PDIP
8-pin SOIC
113oC/W
-
Note (1): The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed.
The device should not be operated at these limits. The “Electrical Characteristics” table defines the conditions for actual
device operation. Exposure to absolute maximum rated conditions for extended periods may affect device reliability.
CONFIDENTIAL
OZ9936-DS-1.1
Page 2
OZ9936
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Test Conditions
Limits
Unit
VDDA=5V; RT=100K;
Min
Typ
Max
CSST=12.1nF, Ta=25 oC
Supply Current
Stand By
V1=0V; V8=0V
V1=2V; V8=0V
350
1.5
600
3.5
I
µA
dds
Operating
mA
I
Capacitance at DRV1 &
DRV2=500pF
dd
Soft Start Current Source
Under Voltage Lockout
ENA_SST_CMP Pin - Low
ISST
UVLO
VCMP
V1=0V; V8=0V; V7=0V
1.7
3.2
3.0
3.8
4.3
4.4
µA
V
V1=1.2V; VDDA from 0V to
5V
0.77
48.5
0.83
50.0
66
0.90
51.5
V
V1=1.2V; V8=660mV;
V7=2.8V
kHZ
ppm/ oC
Operating Frequency on
DRV1 & DRV2 Pin
fop
Température Cœfficient
Duty Cycle on DRV1 &
DRV2 (active high)
Maximum
V1=3.5V; V8=0V; V7=0V
43
%
Ignition Time
V8=0V; V7 ≥3.25V
1.8
2.0
2.2
sec
(Open Lamp Time Out)
Open Lamp Shutdown
Delay Time
ISEN<0.75V
2.21
600
2.60
2.99
sec
mV
V1 (ENA_SST_CMP Pin)
Threshold
ENA
Drivers
DRV1
Ron
Ron
For Iout= 70 mA; Tamb=25oC
For Iout= 70 mA; Tamb=25oC
20
20
40
40
Ω
Ω
DRV2
Analog Dimming Control
Minimum Lamp Current
Reference Voltage
0.40
1.15
0.55
0.86
1.35
V
V
Maximum Lamp Current
Reference Voltage
1.235
External PWM Dimming Control
PWM Dimming Detection
Threshold
2.7
V
1.17
1.25
85
1.32
V
Lamp Current Reference
Voltage
ISEN
ppm/ oC
Température Cœfficient
Note: Vx denotes voltage at Pinx
CONFIDENTIAL
OZ9936-DS-1.1
Page 3
OZ9936
FUNCTIONAL BLOCK DIAGRAM
VDDA
REF
GNDA
OSC
RT
DIM
Control
Logic
Protection
DRV1
DRV2
Control
Logic
&
+
_
+
_
Control
Logic
ISEN
ENA_SST_CMP
Driver
+
_
0.5V
Figure 1
CONFIDENTIAL
OZ9936-DS-1.1
Page 4
OZ9936
FUNCTIONAL DESCRIPTION
connected to RT (Pin 2) determines the operating
frequency. The approximate operating frequency
is calculated by the following equation.
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 OZ9936 yields lower heat
dissipation for the inverter system resulting in
higher reliability.
5.0 x103
fop
=
[KHz]
RT [KΩ]
6. Over-Voltage Protection
The control logic protects the transformer from an
abnormally high voltage at the secondary output.
To illustrate the controller functions, refer to
Figures 1 and 2 on pages 4 and 7, respectively
for the following sections. Other topologies can
be found in the OZ9936 Application Note.
The transformer output voltage is sensed through
Rectifier Diodes (CR1, CR3, CR5, CR8) and
transistor Q5. When the voltage at the emitter of
Q5 is less than –VBE drop, Q5 will conduct and
regulate the output voltage to the transformer
secondary.
2. Enable
The OZ9936 is enabled when the voltage on Pin
1 is greater than 0.55V.
7. Open Lamp Protection
When a CCFL is removed or damaged during
normal operation, the OZ9936 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.
3. Soft Start (SST)
Connecting an external capacitor to Pin
1
provides the SST function. A charging current is
provided to capacitor C11. At Start-up, as
capacitor C11 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.
OZ9936 provides a shutdown delay feature if the
lamp current is not regulated. The inverter
module will remain in normal operation for
approximately 2 to 3 seconds if the input voltage
suddenly drops and subsequently resumes to
normal level.
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 external resistor R13 connected to
RT (Pin 2).
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 2.0
seconds. If no current is sensed after
approximately 2.0 seconds, the OZ9936 shuts
off. Toggling the enable signal from low to
floating will resume normal operation. This is to
ensure that any aged, slow-turn-on CCFL is
provided with sufficient voltage and time to ignite.
5. Normal Operation
OZ9936 operates in a constant frequency mode.
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.
9. Dimming Control
The OZ9936 provides an analog dimming control
function. The input to Pin 7 (DIM) is an analog
voltage of 0.5V to 1.25V that corresponds to
approximately 40% to 100% of the LCD panel
brightness.
Once the CCFL is ignited and current is sensed
at Pin 8 (ISEN), the control loop regulates the
CCFL current. An external resistor, R13,
CONFIDENTIAL
OZ9936-DS-1.1
Page 5
OZ9936
For applications that require an external PWM
dimming, the OZ9936 accepts a PWM signal to
DIM (Pin 7) with a swing voltage of 0V to ≥2.7V.
CONFIDENTIAL
OZ9936-DS-1.1
Page 6
OZ9936
REFERENCE APPLICATION CIRCUIT
CONFIDENTIAL
OZ9936-DS-1.1
Page 7
OZ9936
PACKAGE INFORMATION – 8-PIN SOIC: OZ9936G (150mil)
H
E
1
c
θ
S
D
0.25
0.10MM
e
SEATING PLANE
B
INCHES
MILLIMETERS
DIM
MIN
MAX
0.069
0.010
0.020
0.010
0.157
MIN
1.35
0.10
0.33
0.19
3.80
MAX
1.75
0.25
0.51
0.25
4.00
A
A1
B
c
0.053
0.004
0.013
0.008
0.150
E
e
0.050 BSC.
1.27 BSC.
H
h
S
θ
0.228
0.010
0.0155
0°
0.244
0.020
0.0255
8°
5.80
0.25
0.394
0°
6.20
0.50
0.648
8°
D
-
-
4.80
5.00
JEDEC
MS-012AA
Notes:
1. Controlling dimensions are in millimeter (mm).
2. Pin #1 count orientation shall be in counterclockwise direction as viewed in live-bug position.
CONFIDENTIAL
OZ9936-DS-1.1
Page 8
OZ9936
PACKAGE INFORMATION – 8-PIN PDIP: OZ9936D (300mil)
INCHES
NOR
-
SYMBOLS
MIN
-
0.015
0.125
0.355
MAX
0.210
-
0.135
0.400
A
A1
A2
D
E
E1
L
-
0.130
0.365
0.300 BSC
0.250
0.130
0.355
7
0.245
0.115
0.335
0
0.255
0.150
0.375
15
ẹB
θ
CONFIDENTIAL
OZ9936-DS-1.1
Page 9
OZ9936
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 © 2003-2005, O2Micro International Limited
CONFIDENTIAL
OZ9936-DS-1.1
Page 10
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