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Recipient #105653 printed on 11/8/2005. This is a ONE-TIME copy. Updates will not be provided.
OZ9928
Change Summary
CHANGES
No.
3.
4.
Applicable Section
Absolute Maximum
Ratings
Recommended Operating
Range
Electrical Characteristics
Functional Block Diagram
5.
Functional Description
1.
2.
6.
7.
Reference Application
Circuit
Throughout data sheet
Description
Update the first 2 to read as ‘Input Voltage VIN, LX’ & ‘BST1,
BST2, BST, HDR’.
Update VIN-Input Voltage
Page(s)
3
3
Update Min, Typ & Max limits, add temperature coefficient
Update functional block diagram
Update ‘2. Enable’ voltages; ‘3. SST’ current; ‘4. Ignition’
striking frequency formula; ‘5.Normal Operation’ operating
frequency formula; ‘7. Aged Lamp Ignition’ striking time formula;
‘8. Open Lamp Protection’ current source & shutdown delay
time formula; ‘9. Over-Voltage/Over-Current Protection’ current
source; ’10. Combined Analog and Digital Dimming Control’
formula.
4-5
6
Correct reference application circuit
10
Miscellaneous corrections.
---
7-9
REVISION HISTORY
Revision No.
0.6
Description of change
Initial release
11/04/05
OZ9928-DS-1.0
Copyright © 2005 by O2Micro
All Rights Reserved
Patent #6,259,615, #6,396,722, #6,501,234 & #6,707,264
Release Date
5/31/2005
Page 0
CONFIDENTIAL
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OZ9928
Dual Inverter Controller
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Dual CCFL inverter controller for large size
LCDTV/LCDM
Synchronization for multiple ICs
Supports differential drive
180 degree phase-shift PWM dimming
Mixed-mode dimming control
Selectable shutdown protection mode
User-defined ignition time and shutdown
delay time
Built-in intelligence for ignition and normal
operation of CCFLs
Built-in open-lamp protection and overvoltage protection
Integrated high-side N MOSFET driver
High drive capability
Supports wide input range
Supports system synchronization
Constant operating frequency
The controller provides current and voltage
regulation, soft-start operation, synchronization,
high drive capability, and a selectable shutdown
protection mode feature.
OZ9928 receives either a DC voltage and/or
external PWM signal to perform mixed-mode
PWM dimming. The PWM frequency is userdefined. The IC internally generates two PWM
dimming signals with a 180 degree phase-shift to
minimize current ripple.
PIN DIAGRAM
ORDERING INFORMATION
Part
Number
Temp Range
Package
OZ9928S
-20oC to +85oC
30-pin SSOP
OZ9928SN
-20oC to +85oC
30-pin SSOP
Lead-Free
OZ9928IS
-40oC to +85oC
OZ9928ISN
o
o
-40 C to 85 C
30-pin SSOP
30-pin SSOP
Lead-Free
GENERAL DESCRIPTION
OZ9928 is a high-performance, cost-effective 2channel controller designed for large size CCFL
(Cold Cathode Fluorescent Lamp) or EEFL
(External Electrode Fluorescent Lamp) Liquid
Crystal Display (LCD) applications.
OZ9928 provides six drive signals and is capable
of driving full-bridge and Class-D topologies. The
drive outputs are fixed phase when used for
single-side or differential drive applications.
Multiple OZ9928’s can be synchronized for
driving numerous lamps.
SIMPLIFIED APPLICATION
CIRCUIT
VIN
VIN
16
17
GND
HDR2
18
LX2
19
20
DIM
HDRC
ENA
21
LXC
22
23
24
25
26
The control logic provides a regulated ignition
voltage and appropriate protection features for
over-voltage or over-current conditions. The IC
provides total system protection for differential
drive and single side drive applications.
11/04/05
OZ9928-DS-1.0
Copyright © 2005 by O2Micro
All Rights Reserved
Patent #6,259,615, #6,396,722, #6,501,234 & #6,707,264
27
28
29
30
BST1
BST2
HDR2
HDR1
LX1
LDR2
LX2
PGND
BSTC
LDRC
HDRC
LDR1
LXC
VREF
GNDA
CT
VIN
SY NC
RPT
ENA
LCT
VSEN1
DIM
ISEN1
TIMER1
VSEN2
TIMER2
ISEN2
SSTCMP1
SSTCMP2
15
14
LX1
T1
13
12
11
VIN
10
9
HDRC
8
T2
LXC
7
6
5
4
3
2
1
T3
VIN
HDR2
LX2
T4
Page 1
CONFIDENTIAL
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OZ9928
PIN DESCRIPTION
Pin No.
Names
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
SSTCMP2
ISEN2
VSEN2
ISEN1
VSEN1
ENA
SYNC
VIN
VREF
LDR1
LDRC
PGND
LDR2
LX1
HDR1
BST1
BST2
HDR2
LX2
BSTC
HDRC
LXC
GNDA
CT
RPT
26
LCT
27
28
29
30
DIM
TIMER1
TIMER2
SSTCMP1
Soft start and compensation for controller 2
Lamp current sense for controller 2
Transformer output voltage and over-current detection for controller 2
Lamp current sense input for controller 1
Transformer output voltage and over-current detection for controller 1
OZ9928 on/off control
Operation frequency sync signal input
Power
Reference voltage
Low side driver for controller 1
Low side driver for controllers 1 and 2
Power GND
Low driver for controller 2
High side N-Channel power MOSFET source for controller 1
High side power MOSFET driver for controller 1
High side driver boost voltage for HDR1
High side driver boost voltage for HDR2
High side power MOSFET driver for controller 2
High side N-Channel power MOSFET source for controller 2
High side driver boost voltage (HDRC) for controllers 1 and 2
High side power MOSFET driver for controller 1 and 2
High side N-Channel power MOSFET source for controllers 1 and 2
Signal GND
Timing capacitor and resistor setting for operation and striking frequency
Sync signal output for master mode. Connect to GND for slave mode.
Timing capacitor and resistor setting for low frequency oscillator or external
PWM pulse input.
DC voltage for PWM dimming or analog dimming.
Striking and shutdown delay timer for controller 1
Striking and shutdown delay timer for controller 2
Soft start and compensation for controller 1
CONFIDENTIAL
OZ9928-DS-1.0
Page 2
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OZ9928
ABSOLUTE MAXIMUM RATINGS(1)
Input Voltage VIN, LX
BST1,BST2,BST, HDR
GNDA
Signal Inputs
Operating Temp.
33.0V
40V
+/- 0.3V
-0.3V to (VREF+0.3V)
OZ9928
o
o
-20 C to +85 C
Operating Junction Temp.
Storage Temp.
OZ9928I
-40oC to +85oC
125oC
-55oC to 150oC
RECOMMENDED OPERATING RANGE
VIN - Input Voltage
fop - Operating Frequency
Thermal Impedance (θJ-A)
- 30-pin SSOP
7.5V to 30.0V
20KHz to 150KHz
80 oC/W
(1)
Note : 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
OZ9928-DS-1.0
Page 3
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OZ9928
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Test Conditions
Limits
Unit
o
VIN=12V; Ta=25 C
RCT=68.1K ohm, CCT=220pF
Min
Typ
Max
RLCT=3.3M, CLCT=4700p
Supply Current
Stand By
Idds
ENA=0V
-
5.0
10.0
µA
Operating
Idd
ENA=2V
1.0
3.0
5.0
mA
ISSTCMP1
2.6
4.3
6.0
µA
ISSTCMP2
2.6
4.3
6.0
µA
Lock out
UVLO
-
-
5.5
V
Resume
UVLO
7.5
-
-
V
5.39
5.50
5.61
V
Soft Start
Current Source
Under Voltage Lockout
Reference Voltages
VREF
VREF
Temperature Coefficient
ISEN1=SSTCMP1
DIM=1V, LCT=0V
ISEN1 reference voltage
1.46
Temperature Coefficient
ISEN2=SSTCMP2
DIM=1V, LCT=0V
ISEN2 reference voltage
ISEN1=0V
VSEN1 reference voltage
1.46
VSEN2=SSTCMP2
ISEN2=0V
1.54
1.50
2.94
3.00
o
1.54
Temperature Coefficient
3.00
V
o
ppm/ C
3.06
V
o
300
2.94
V
ppm/ C
300
Temperature Coefficient
VSEN2 reference voltage
1.50
ppm/ C
300
Temperature Coefficient
VSEN1=SSTCMP1
o
300
ppm/ C
3.06
V
o
300
ppm/ C
Driver Frequency
Striking
Normal operation
CONFIDENTIAL
fst
fop
75.7
Temperature Coefficient
OZ9928-DS-1.0
87.1
68.9
167
KHZ
O
170
66.8
Temperature Coefficient
81.4
ppm/ C
71.0
kHz
O
ppm/ C
Page 4
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OZ9928
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
Symbol
Test Conditions
Limits
Unit
o
VIN=12V; Ta=25 C
RCT =68.1K ohm, CCT=220pF
Min
Typ
Max
RLCT=3.3M, CLCT=4700p
Timer and Protection
ITIMER1
ISEN1 =0V, VSEN1 & gt; 3.0V
1.2
1.8
2.4
uA
ITIMER2
ISEN2 =0V, VSEN2 & gt; 3.0V
1.2
1.8
2.4
uA
ITIMER1
ISEN1 & gt; 1V and (SSTCMP1
& gt; 3.3V or VSEN1 & gt; 3.0V)
5.3
7.3
9.3
uA
ITIMER2
ISEN2 & gt; 1V and (SSTCMP2
& gt; 3.3V or VSEN2 & gt; 3.0V)
5.3
7.3
9.3
uA
206.0
213.5
221.0
Hz
Striking current Source
Open lamp and over current
protection current Source
PWM Dimming Control
Master Mode LCT Frequency
FLF
400
Temperature Coefficient
O
ppm/ C
ENA Threshold
Enable
2.0
-
-
V
Disable
-
-
1.0
V
Logic High
1.5
-
-
V
Logic Low
-
-
0.5
V
SYNC/RPT
Drivers
HDRC and LDRC Sourcing
Ron
2
9
16
Ω
HDRC and LDRC Sink
Ron
1
3
6
Ω
HDR1/2 and LDR1/2
Sourcing
Ron
8
12
20
Ω
HDR1/2 and LDR1/2 Sink
Ron
2
5
9
Ω
95
-
-
%
Maximum Overlap Ratio
CONFIDENTIAL
OZ9928-DS-1.0
Page 5
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OZ9928
FUNCTIONAL BLOCK DIAGRAM
Figure 1
CONFIDENTIAL
OZ9928-DS-1.0
Page 6
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OZ9928
FUNCTIONAL DESCRIPTION
determined by capacitors C18 and C17
connected to SSTCMP2 (pin 1) and SSTCMP1
(pin 30) respectively.
1. Power Conversion
Referring to Figures 1 and 2 on pages 6 and 10
respectively, OZ9928 consists of two drive
circuits. Drive signals HDR1, HDR2, LDR1 and
LDR2 (pins 15, 18, 10 and 13, respectively) are
phased-shifted with respect to HDRC and LDRC
(pins 21 and 11) to achieve high efficiency, zerovoltage switching operation. The drive signals for
controller 1, (HDR1, LDR1, HDRC and LDRC)
and controller 2, (HDR2, LDR2, HDRC and
LDRC) drive their respective switching devices.
Both controllers, 1 and 2, share drive signals
HDRC and LDRC.
OZ9928 is designed to suit various power
conversion topologies such as full-bridge or
Class-D topologies. It provides symmetrical drive
pulses to the tank circuit including the
transformer(s), output capacitors and the
lamp/panel load that yields quasi-sinusoidal lamp
voltage and current waveforms. The IC is
designed such that multiple controllers can be
used in a system to drive a load with in-phase or
out-of phase synchronization. This feature
provides a high-degree of design flexibility for
either single-side or differential lamp drive
applications. High efficiency operation of the
OZ9928 yields lower heat dissipation for the
inverter system resulting in higher reliability.
To illustrate the controller functions, refer to
Figures 1 and 2 on pages 6 and 10, respectively
for the following sections.
2. Enable
OZ9928 is enabled when the voltage on ENA (pin
6) is greater than 2.0V. A voltage of less than
1.0V disables the IC. When the IC is disabled, it
draws approximately 10uA. An under-voltage
lockout protection feature is provided to disable
the IC if VIN voltage drops below a threshold of
approximately 5.5V. The IC will resume normal
operation once VIN reaches a threshold voltage
of greater than approximately 7.5V.
A charging current of ~4uA is provided to
capacitors C17 and C18. At start-up, as
capacitors C17 and C18 charge, the voltage level
at the capacitor controls the gradual increase in
the power delivered to transformers T1/T2 and
T3/T4 for controllers 1 and 2, respectively. This
reduces in-rush current and provides reliable
operation to the lamp.
4. Ignition
During striking (turn-on), OZ9928 generates a
higher frequency for lamp ignition. The striking
frequency is determined by the combination of
C11 and R8 connected to CT (pin 24).
The striking frequency is approximated by the
following equation:
fst[kHz] =
5. Normal Operation
After the ignition period, the operating frequency
is determined by either an external clock if the
external synchronization signal is present, or by
the internal clock generator. The control loop
regulates the average current through the lamp
by adjusting the power to the transformers.
Once sufficient current is sensed by resistors
R16 and R24 for controllers 1 and 2, respectively,
SSTCMP1 and SSTCMP2 take control of their
respective control loop and start to regulate the
lamp current.
The operating frequency is determined by
resistor R8 and capacitor C11 connected to CT
(pin 24).
The operating frequency is
approximated by the following equation:
3. Soft Start (SST)
10.32×10
5
To avoid component stresses and in-rush current
to the load during turn-on, a soft-start function is
implemented to provide reliable load operation.
The soft-start function is initiated when the
voltage at ENA (pin 6) is greater than 2V. The
soft-start time for controllers 1 and 2 is
CONFIDENTIAL
4100/ RCT [kΩ] + 11.5
x 1000
4*CCT[pF]
fop[kHz] =
CCT[pF]×RCT[kΩ]
Constant-frequency
operation
eliminates
interference of the inverter and LCD panel that
often occurs in a variable frequency inverter
system. The peak and valley of the sawtooth CT
waveform are 2V and 0V respectively.
OZ9928-DS-1.0
Page 7
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OZ9928
8. Open Lamp Protection
6. Individual and Common Mode
Protection
OZ9928 offers the designer the flexibility of
setting the IC in Common or Individual Protection
Mode.
Common Protection Mode is set by connecting
capacitor C15 to Timer 1 (pin 28) and connecting
Timer2 (pin 29) to VREF. If either controller
encounters an abnormal condition, such as an
open-lamp, damage lamp or lamp removal
condition, the shutdown delay timer is activated.
Once the timer expires, OZ9928 will shutdown
and latch.
Individual Protection Mode is set by connecting
capacitors C15 and C16 to pins Timer1 and
Timer2
respectively.
If
either
controller
encounters an abnormal condition, its respective
shutdown delay timer is activated. Once the
timer expires, the abnormal controller will
shutdown and latch. The other controller will
remain in normal operation.
When a lamp is removed or damaged during
normal operation, the voltage on pin SSTCMP1
or SSRCMP2 of the abnormal controller rises
rapidly. Once the voltage at SSTCMP1 or
SSTCMP2 of the abnormal controller reaches an
~2.5V threshold, a current source of ~7.3uA
charges the capacitor (C15 or C16) connected to
the TIMER pin (TIMER1 or TIMER2) of the
abnormal controller. Once the voltage level at
TIMER1 or TIMER2 of the respective controller
reaches an ~3V threshold, the controller outputs
shutdown and latch or the entire IC will shutdown
and latch, depending on the protection mode
setting. The shutdown delay feature avoids
inverter shutdown due to a VIN transient or if a
lamp has a positive impedance characteristic.
The approximate shutdown delay
calculated by the following equation.
time
is
Td [Sec] = 0.41 x CTIMER1/2 [uF]
To resume operation, toggling the ENA pin resets
both controllers.
7. Aged Lamp Ignition
During the ignition process, the controller senses
the voltage at the lamp and regulates the striking
voltage through a feedback loop control for its
respective controller.
Once the IC is enabled, the internal striking timer
is activated. The transformer output voltage is
sensed through VSEN1 and VSEN2 of controllers
1 and 2 respectively. When the voltage at VSEN1
or VSEN2 reaches ~3.0V threshold, OZ9928
regulates the output voltage of the respective
transformer secondary. If the lamps are not
ignited within the user-defined striking time, the
respective controller will shutdown and latch.
Depending on the Protection Mode setting, the
other controller will also shutdown and latch or
remain in normal operation. This is to ensure that
any aged, slow-turn-on lamp is provided with
sufficient voltage and time to ignite.
The ignition (turn-on) time is determined by
capacitor C15 and C16 connected to TIMER1
(pin 28) and TIMER2 (pin 29) respectively.
The approximate striking time is calculated by the
following equation.
Tstriking [Sec] = 1.67 x CTIMER1/2 [uF]
Toggling ENA will reset both controllers
CONFIDENTIAL
9. Over-Voltage/Over-Current
Protection
Over-voltage
and
over-current
protection
conditions for both controllers are monitored by
VSEN1 and VSEN2 for controllers 1 and 2
respectively.
During normal operation, if the voltage at either
VSEN1 or VSEN2 reaches a threshold of
approximately 3.0V, the error amplifier output of
the respective controller will maintain a constant
voltage level. Meanwhile, a ~7.3uA current
source charges the capacitor connected to the
timer pin of the abnormal controller. Depending
on the protection mode setting, once the voltage
on the abnormal controller TIMER pin reaches
~3V, the abnormal controller will shut down and
latch or the OZ9928 will shutdown and latch.
Toggling ENA resets both controllers.
10. Combined Analog and Digital
Dimming Control
A built-in function combines the low-frequency
PWM (LPWM) and analog dimming functions for
controllers 1 and 2 to perform wide dimming
control for the lamps. The LPWM frequency is
determined by capacitor C13 and resistor R9
connected to LCT (pin 26).
OZ9928-DS-1.0
Page 8
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OZ9928
The frequency is approximated by the following
equation:
During the ignition process, the RPT-SYNC
connection between the master and slave switch
at 0V to ~2V square pulses.
3.31×106
fLF[Hz] =
CLCT [pF] ×RLCT [MegΩ]
When the DIM pin input voltage is less than 1.5V,
the DIM pin is compared with the sawtooth LCT
waveform and yields a proper low frequency
pulse width to modulate the CCFL brightness.
The LPWM pulse to each controller is phaseshifted by 180 degrees to reduce input current
ripple. The peak and valley of the LCT signal are
1.5V and 0V respectively.
When the DIM pin input voltage is increased
above 1.5V, the low frequency pulse width
achieves 100% duty cycle and DIM pin input
voltage sets the IC in analog dimming control
mode and controls the amplitude of the lamp
current.
The output current amplitude is
proportional to the analog signal.
Once the voltage at the ISEN1/2 pin for both
master and slave reaches the lamp “on” detection
threshold of ~1V or 0.6xDIM, the IC’s switch from
the striking mode to the normal operation mode
and the LPWM dimming control is allowed to
function. The connection between RPT-SYNC of
the master and slave is switching at 0V to ~5.5V
square pulses.
When set in the Common Protection Mode, if an
abnormal condition exists, such as lamp removal,
over-current, over-voltage, short circuit during
normal operation, the RPT-SYNC connection will
switch at 0V to ~2V square pulses and the
capacitor connected to TIMER1 will be charged.
Once the voltage at TIMER1 reaches ~3V, the
IC’s will shutdown and latch.
OZ9928 accepts an external PWM dimming
control function. The input to LCT (pin 26) is a
pulse width modulated signal with a logic-high
level greater than 2.0V. OZ9928 provides a
brightness control from 0% to 100%.
11. Master-Slave Mode
The OZ9928 provides a master-slave mode of
operation when driving multiple lamps in a large
size LCDM or LCDTV application. Proprietary
design of the master-slave synchronization
ensures that the CCFL can be driven with a 180degree off-phase to both ends of the CCFL.
When the controller is designed as a “master”,
the internal clock determines the operating
frequency while the slave controller receives the
external clock signal.
The master controller is configured such that the
RPT pin is pulled high to VREF by a 5.1k to 10k
ohm resistor and connected to the SYNC pin of
the slave controller. The RPT pin of the slave
controller is pulled to GNDA.
If there is no external synchronization clock
signal to SYNC (pin 7) of master controller, the
master controller will operate at a free-run
frequency determined by capacitor C11 and
resistor R8 connected to CT (pin 24). If an
external synchronization signal is present, the
operating frequency of the master controller is
half of the external clock signal.
CONFIDENTIAL
OZ9928-DS-1.0
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OZ9928
REFERENCE APPLICATION CIRCUIT
OZ9928
Figure 2
VIN : 24V+/-10%
ENA : 0V-1.0V,disable; 2.0V-5.0V, enable
DIM: 0.5V Min. Brightness; 1.6V Max. Brightness
SYNC: 150KHz, 0V-3.3V pulse signal
CONFIDENTIAL
OZ9928-DS-1.0
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OZ9928
PACKAGE INFORMATION – 30-PIN SSOP: OZ9928S (209mil)
CONFIDENTIAL
OZ9928-DS-1.0
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OZ9928
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
OZ9928-DS-1.0
Page 12