OZ9939DN [ETC]
LCDM Inverter Controller Change Summary;
| 型号： | OZ9939DN |
| 厂家： | 
ETC |
| 描述： | LCDM Inverter Controller Change Summary CD |
| 文件： | 总12页 (文件大小：251K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OZ9939
Change Summary
CHANGES
No.
Applicable Section
Description
Page(s)
1. Electrical Characteristics
Updated limits for Protection Release Threshold
3
REVISION HISTORY
Revision No.
Description of change
Release Date
5/12/2005
0.6
Initial release
0.65
1. Electrical Characteristics: a. Modify general test conditions in line 1; b.
Modify ‘Driver Frequency – Striking & Normal Operation’ Typ limit; c.
6/27/2005
Modify ‘PWM Dimming Control
– LCT frequency’, 2. Reference
Application Circuit: Modify C14, C9 & R9 values
1.0
Ordering Information: Add OZ9939G, IG, D & DN. Recommended
Operating Range: 1. Add ‘Dimming Range’; 2. Fill in ‘Thermal Impedance’.
Electrical Characteristics: 1. Update ‘Supply Current’ limits; 2. Update ‘Soft
Start’ limits; 3. Update ‘Under Voltage Lockout’ limits; 4. Update ‘Reference
Voltage’ limits; 5. Update ‘Driver Frequency’ limits; 6. Update ‘Timer &
Protection’ limits; 6. Update ‘Drivers’ parameter name & limits; 7. Update
‘PWM Dimming Control’ limits; 8. Delete ‘Analog Dimming Control’.
Function Description: Update formula in NO. 4 Ignition, No. 6 Normal
Operation & No. 9 Dimming Control. Package Information: Add DIP
package drawing. Throughout datasheet: Miscellaneous changes.
9/21/2005
10/27/2005
OZ9939-DS-1.1
Page 0
Copyright © 2005 by O2Micro
All Rights Reserved
CONFIDENTIAL
Patent#6,559,606, #6,856,519 & #6,809,93800
OZ9939
LCDM Inverter Controller
FEATURES
The control logic provides a regulated ignition
voltage and appropriate protection features for
over-voltage or over-current conditions.
•
•
•
Negative PWM dimming polarity
Constant operating frequency
Drives positive/negative-impedance lamps
during ignition
The OZ9939 offers a high level of integration,
while maintaining flexibility and high-efficiency
operation that reduces external component
heating, resulting in higher reliability and longer
CCFL life. The proprietary design technique
provides a simple, low-cost system solution.
•
•
High drive current for external MOSFETs
User-defined ignition time and shutdown
delay time
•
•
Multiple mode dimming control
Built-in intelligence for ignition and normal
operation of CCFLs
•
•
Built-in open-lamp protection and over-
voltage protection for backlight system
Optimized soft-start function
PIN DIAGRAM
ORDERING INFORMATION
Part
Number
Temp Range
-20oC to 85oC
-20oC to 85oC
-40oC to 85oC
-40oC to 85oC
-20oC to 85oC
-20oC to 85oC
Package
OZ9939G
16-pin SOIC
16-pin SOIC
Lead-Free
OZ9939GN
OZ9939IG
OZ9939IGN
OZ9939D
16-pin SOIC
16-pin SOIC
Lead-Free
16-pin DIP
16-pin DIP
Lead-Free
OZ9939DN
SIMPLIFIED APPLICATION
CIRCUIT
GENERAL DESCRIPTION
The OZ9939 is a high performance, cost-effective
CCFL (Cold Cathode Fluorescent Lamp)
controller designed for driving large-size Liquid
Crystal Display (LCD) applications requiring 2 to
6 CCFLs.
The controller converts unregulated DC voltages
into a nearly sinusoidal lamp voltage and current
waveforms.
The OZ9939 provides two drive signals for most
power conversion topologies while maintaining
high-efficiency operation. The PWM controller
provides
a soft-start operation, current and
voltage regulation, over-voltage and over-current
protection, high drive capability and multiple
dimming functions (internal PWM or external
PWM or analog dimming functions).
10/27/2005
Copyright © 2005 by O2Micro
OZ9939-DS-1.1
All Rights Reserved
Page 1
CONFIDENTIAL
Patent#6,559,606, #6,856,519 & #6,809,93811
OZ9939
PIN DESCRIPTION
Pin No.
Names
Description
1
DRV1
Drive output
2
3
VDDA
TIMER
Supply voltage input
Timing capacitor to set striking time and shutdown delay time
Analog dimming or Internal LPWM dimming or external PWM pulse input for
dimming function
4
DIM
5
6
7
ISEN
VSEN
OVPT
NC
Current sense feedback
Voltage sense feedback
Over-voltage/ over-current protection threshold setting pin
No connection
8
9
NC
No connection
10
ENA
ON/OFF control of IC
Timing capacitor to set internal PWM dimming frequency and also a pin for
analog dimming selection
11
LCT
12
13
14
15
16
SSTCMP
CT
GNDA
DRV2
PGND
Capacitor for soft start time and loop compensation
Timing resistor and capacitor for operation and striking frequency
Ground for analog signals
Drive output
Ground for power paths
ABSOLUTE MAXIMUM RATINGS(1)
Input Voltage VDDA
GNDA
7.0V
+/- 0.3V
Signal Inputs
-0.3V to VDDA +0.3V
OZ9939
-20oC to 85oC
OZ9939I
-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
20KHz to 150KHz
0.7V to 2.1V
fop - Operating Frequency
Analog Dimming Range
Thermal Impedance (θJ-A
)
86 oC/W
56 oC/W
-
-
16-pin SOP
16-pin DIP
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
OZ9939-DS-1.1
Page 2
OZ9939
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Test Conditions
VDDA=5V; Ta=25 oC
Limits
Unit
RCT =39Kohm, CCT=470pF
RLCT =3.3Mohm, CLCT=4.7nF
Min
Typ
Max
Supply Current
Stand By
Operating
Idds
Idd
ENA=0V
2.0
2.0
5.0
2.5
µA
Capacitance at DRV1 &
DRV2=2nF
1.5
mA
Soft Start
Current Source
ISSTCMP
1.83
2.29
2.75
3.2
µA
Under Voltage Lockout
Lock Out
UVLO
UVLO
VDDA 5VÆ0V
VDDA 0VÆ5V
V
V
Resume
4.0
Reference Voltage
ISEN=SSTCMP
1.12
1.18
360
1.23
3.06
V
ISEN Reference Voltage
Temperature Coefficient
ppm/ OC
VSEN=SSTCMP
2.78
2.92
310
V
VSEN Reference Voltage
During Striking
Temperature Coefficient
ppm/ OC
Driver Frequency
62.6
50.0
65.8
290
52.0
110
69.0
54.0
KHZ
ppm/ OC
kHz
Striking
fstr
Temperature Coefficient
Temperature Coefficient
Normal Operation
Fop
ppm/ OC
Timer and Protection
Striking Current Source
ISEN =0V
2.3
8.0
2.9
3.5
uA
uA
Open Lamp and Over Voltage
Protection Current Source
SSTCMP > 3.3V or
VSEN>OVPT
10.0
12.0
Protection Release Threshold
2.60
2.81
3.02
V
Drivers
DRV1/2 Source
Ron
Ron
12
5
18
9
Ω
DRV1/2 Sink
Ω
%
Maximum Duty Cycle
45
CONFIDENTIAL
OZ9939-DS-1.1
Page 3
OZ9939
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
Symbol
Test Conditions
VDDA=5V; Ta=25 oC
Limits
Unit
RCT =39Kohm, CCT=470pF
RLCT =3.3Mohm, CLCT=4.7nF
Min
194
Typ
Max
PWM Dimming Control
LCT Frequency
200
206
2.0
Hz
ENA Threshold
On
Off
V
V
1.0
CONFIDENTIAL
OZ9939-DS-1.1
Page 4
OZ9939
FUNCTIONAL BLOCK DIAGRAM
Figure 1
CONFIDENTIAL
OZ9939-DS-1.1
Page 5
OZ9939
FUNCTIONAL DESCRIPTION
(Pin 6). When the voltage at VSEN reaches a
threshold of approximately 3.0V, the IC regulates
the output voltage at the transformer secondary.
If the lamps are not ignited when the voltage at
1. Power Conversion
The OZ9939 controller is designed to suit various
power conversion topologies and provides
symmetrical drive pulses to the tank circuit that
includes the transformer(s), output capacitors
and the CCFL/panel load that yields quasi-
sinusoidal CCFL voltage and current waveforms.
High efficiency operation of the OZ9939 yields
lower heat dissipation for the inverter system
resulting in higher reliability.
TIMER (pin 3) reaches
a
threshold of
approximately 3V, the IC will shutdown and latch
The approximate striking time is calculated by the
following equation.
T
str [Sec] = CTIMER [uF]
To resume normal operation, toggle the ENA
signal or reset VDDA.
To illustrate the controller functions, refer to
Figures 1 and 2 on pages 5 and 8, respectively
for the following sections.
6. Normal Operation
2. Enable
Once the lamps are ignited and the voltage at
ISEN (pin 5) is >0.7V, the IC enters the normal
operation mode and the PWM dimming control is
activated.
The operating frequency is determined by
resistor (R9) and capacitor (C9) connected to CT
(pin 13). The control loop regulates the average
current through the lamps by adjusting the duty
cycle of the output drives. Constant frequency
operation eliminates interference with the inverter
and LCD panel that often occurs in a variable
frequency inverter system. The peak and valley
of the CT waveform are 2V and 0V respectively.
Applying a voltage level greater than 2V to ENA
(pin 10) enables the IC. A voltage less than 1V
will disable the IC.
3. Soft-Start (SST)
Utilizing a patented multi-task technique, the soft-
start function and the loop compensation function
are combined to provide
a good start-up
characteristic. Connecting an external capacitor
to SSTCMP (pin 12) provides the functions. In
the start-up mode, current charges capacitor C13
connected to SSTCMP. The voltage at the
capacitor controls the gradual increase in power
to the transformer and subsequently to the output
load. This reduces in-rush current and provides
reliable operation to the CCFL.
The approximate operating frequency is
calculated by the following equation.
9.53 x105
fop
=
[KHz]
RCT [KΩ]*CCT[pF]
4. Ignition
7. Open Lamp Protection
When the VDDA voltage exceeds the under-
voltage lockout threshold, the IC is enabled an
internal striking timer is activated.
If a CCFL is removed or damaged during normal
operation, the voltage at SSTCMP (pin 12) rises
rapidly. When the voltage at SSTCMP reaches a
threshold of approximately 2.5V, a current source
charges the capacitor (C17) connected to TIMER
(pin 3). Once the voltage level at the TIMER pin
reaches a threshold of approximately 3V, the
drive outputs shut down and latch.
The approximate striking frequency is calculated
by the following equation.
3812/ RCT [KΩ] + 26
fst =
X1000 [KHz]
4 *CCT[pF]
The shutdown delay feature avoids inverter
shutdown due to a VIN transient or if a lamp has
a positive impedance characteristic.
5. Aged CCFL Ignition
OZ9939 provides a striking timer function to
ensure that any aged, slow-turn-on CCFL is
provided with sufficient voltage and time to ignite.
The transformer output voltage is sensed at
VSEN
The approximate shutdown delay time is
calculated by the following equation.
Td [Sec] = 0.33 XCTIMER [uF]
CONFIDENTIAL
OZ9939-DS-1.1
Page 6
OZ9939
To resume operation, toggle the ENA signal or
restart VDDA.
External PWM dimming is implemented by
setting LCT to a DC voltage between 0.5V to
1.0V using a resistor divider (R8 and R17)
between VDDA and GND. Apply the external
PWM pulse to DIM (pin 4).
8. Over-Voltage and Over-Current
Protection
.
Over-voltage and over-current protection are
monitored by the voltage on VSEN (pin 6).
During normal operation, if a CCFL is damaged
or removed, the voltage at VSEN (pin 6)
increases. Once the voltage at VSEN exceeds
the user-defined, preset voltage set by OVPT (pin
7), the driver output duty cycle is regulated and
the shutdown delay timer is activated. OVPT
sets the overall protection threshold voltage that
is lower than ~3V (VSEN threshold). Once the
voltage at TIMR pin reaches ~3V, the IC will shut
down and latch.
OVPT voltage setting is
determined by a resistor divider (R13 and R16)
connected to the OVPT.
The approximate shutdown delay time is
calculated by the following equation.
Td [Sec] = 0.33 XCTIMER [uF]
To resume operation, toggle the PWM signal or
restart VDDA.
9. Dimming Control
A built-in function enables the user to select one
of the following dimming controls: analog, internal
LPWM or external PWM signal.
Analog dimming control is activated when the
voltage to LCT (pin 11) is greater than 3V.
A
voltage of 0.5V to 1.25V applied to DIM (pin 4)
controls the amplitude of the lamp current.
Internal LPWM dimming control is determined by
resistor R8 and capacitor C14 connected to LCT.
The low frequency sawtooth waveform is
compared with the voltage at DIM to generate the
LPWM signal. The peak and valley of the
waveform are 1.5V and 0.1V respectively.
The frequency is approximated by the following
equation:
3102
f LOSC
=
[Hz]
RLCT [MΩ]*CLCT[nF]
With negative PWM dimming polarity, the LPWM
duty cycle will be 100% when DIM pin voltage is
lower than 0.1V. LCD panel will have maximum
brightness. When DIM pin voltage is higher than
1.5V, the LPWM duty cycle will be 0%. LCD
panel will be totally dark.
CONFIDENTIAL
OZ9939-DS-1.1
Page 7
Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered
recipients.
OZ9939
REFERENCE APPLICATION CIRCUIT
VIN: 10.8V---13.2V
ENA: 0V---1.0V, disable. 2.0V---5.0V, Enable
DIM: 0V---1.3V; 0V, maximum brightness; 1.3V, minimum brightness
Figure 2
CONFIDENTIAL
OZ9939-DS-1.1
Page 8
OZ9939
PACKAGE INFORMATION – 16-PIN SOP: OZ9939G (150mil)
D
E H
A
B
e
A1
C
α
L
INCHES
MIN MAX
0.0532 0.0688
0.0040 0.0098
MILLIMETERS
DIM
MIN
1.35
0.10
0.33
0.19
9.80
3.80
MAX
1.75
0.25
0.51
0.25
10.00
4.00
A
A1
B
C
D
0.013
0.020
0.0075 0.0098
0.3859 0.3937
0.1497 0.1574
0.050 BCS.
E
e
1.27 BCS.
0.244
0
H
0.2284
5.80
6.20
L
0.016
0.050
0.40
1.27
α
0°
8°
0°
8°
CONFIDENTIAL
OZ9939-DS-1.1
Page 9
OZ9939
PACKAGE INFORMATION – 16-PIN DIP: OZ9939D (300mil)
CONFIDENTIAL
OZ9939-DS-1.1
Page 10
OZ9939
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 © 2005, O2Micro International Limited
CONFIDENTIAL
OZ9939-DS-1.1
Page 11
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