OZ9939 Change Summary Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. CHANGES No. 1. Applicable Section Electrical Characteristics Description Updated limits for Protection Release Threshold Page(s) 3 REVISION HISTORY Revision No. 0.6 0.65 1.0 Description of change Initial release 1. Electrical Characteristics: a. Modify general test conditions in line 1; b. Modify ‘Driver Frequency – Striking & Normal Operation’ Typ limit; c. Modify ‘PWM Dimming Control – LCT frequency’, 2. Reference Application Circuit: Modify C14, C9 & R9 values 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. 10/27/2005 OZ9939-DS-1.1 Copyright © 2005 by O2Micro All Rights Reserved Patent#6,559,606, #6,856,519 & #6,809,93800 Release Date 5/12/2005 6/27/2005 9/21/2005 Page 0 CONFIDENTIAL OZ9939 Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. LCDM Inverter Controller FEATURES • • • • • • • • • Negative PWM dimming polarity Constant operating frequency Drives positive/negative-impedance lamps during ignition 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 overvoltage protection for backlight system Optimized soft-start function The control logic provides a regulated ignition voltage and appropriate protection features for over-voltage or over-current conditions. 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. PIN DIAGRAM ORDERING INFORMATION Part Number Temp Range Package OZ9939G o o -20 C to 85 C 16-pin SOIC OZ9939GN o o -20 C to 85 C 16-pin SOIC Lead-Free OZ9939IG o o -40 C to 85 C 16-pin SOIC OZ9939IGN o o -40 C to 85 C 16-pin SOIC Lead-Free OZ9939D o o -20 C to 85 C OZ9939DN o o -20 C to 85 C 16-pin DIP 16-pin DIP Lead-Free GENERAL DESCRIPTION SIMPLIFIED APPLICATION CIRCUIT 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 OZ9939-DS-1.1 Copyright © 2005 by O2Micro All Rights Reserved Patent#6,559,606, #6,856,519 & #6,809,93811 Page 1 CONFIDENTIAL OZ9939 Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. PIN DESCRIPTION Pin No. Names 1 2 3 DRV1 VDDA TIMER 4 DIM 5 6 7 8 9 10 ISEN VSEN OVPT NC NC ENA 11 LCT 12 13 14 15 16 SSTCMP CT GNDA DRV2 PGND Description Drive output 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 Current sense feedback Voltage sense feedback Over-voltage/ over-current protection threshold setting pin No connection No connection ON/OFF control of IC Timing capacitor to set internal PWM dimming frequency and also a pin for analog dimming selection 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 Signal Inputs Operating Temp. 7.0V +/- 0.3V -0.3V to VDDA +0.3V OZ9939 -20oC to 85oC Operating Junction Temp. Storage Temp. OZ9939I -40oC to 85oC 125oC -55oC to 150oC RECOMMENDED OPERATING RANGE VDDA - Input Voltage fop - Operating Frequency Analog Dimming Range 4.5V to 5.5V 20KHz to 150KHz 0.7V to 2.1V Thermal Impedance (θJ-A) - 16-pin SOP 16-pin DIP o 86 C/W o 56 C/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 OZ9939-DS-1.1 Page 2 OZ9939 Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. ELECTRICAL CHARACTERISTICS Parameter Symbol Test Conditions Limits Unit o VDDA=5V; Ta=25 C RCT =39Kohm, CCT=470pF Min Typ Max 2.0 5.0 µA 1.5 2.0 2.5 mA 1.83 2.29 2.75 µA 3 .2 V RLCT =3.3Mohm, CLCT=4.7nF Supply Current Stand By Operating Idds ENA=0V Idd Capacitance at DRV1 & DRV2=2nF Soft Start Current Source ISSTCMP Under Voltage Lockout Lock Out UVLO VDDA 5VÆ0V Resume UVLO VDDA 0VÆ5V 4.0 ISEN=SSTCMP 1 .1 2 V Reference Voltage 1.18 1.23 V ISEN Reference Voltage Temperature Coefficient VSEN=SSTCMP VSEN Reference Voltage During Striking O ppm/ C 360 2 .7 8 Temperature Coefficient 2.92 3.06 V O ppm/ C 310 Driver Frequency Striking fstr Normal Operation Fop 62.6 Temperature Coefficient 65.8 69.0 50.0 Temperature Coefficient 52.0 KHZ O 290 ppm/ C 54.0 kHz O 110 ppm/ C Timer and Protection Striking Current Source Open Lamp and Over Voltage Protection Current Source ISEN =0V 2.3 2.9 3.5 uA SSTCMP > 3.3V or VSEN>OVPT 8.0 10.0 12.0 uA 2.60 2.81 3.02 V Protection Release Threshold Drivers DRV1/2 Source Ron 12 18 Ω DRV1/2 Sink Ron 5 9 Ω Maximum Duty Cycle CONFIDENTIAL 45 OZ9939-DS-1.1 % Page 3 OZ9939 Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. ELECTRICAL CHARACTERISTICS (Continued) Parameter Symbol Test Conditions Limits Unit o VDDA=5V; Ta=25 C RCT =39Kohm, CCT=470pF Min Typ Max 194 200 206 Hz 2.0 V RLCT =3.3Mohm, CLCT=4.7nF PWM Dimming Control LCT Frequency ENA Threshold On Off CONFIDENTIAL 1.0 OZ9939-DS-1.1 V Page 4 Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. OZ9939 FUNCTIONAL BLOCK DIAGRAM Figure 1 CONFIDENTIAL OZ9939-DS-1.1 Page 5 OZ9939 FUNCTIONAL DESCRIPTION Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. 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 quasisinusoidal CCFL voltage and current waveforms. High efficiency operation of the OZ9939 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 5 and 8, respectively for the following sections. 2. Enable 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 softstart 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. (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 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. Tstr [Sec] = CTIMER [uF] To resume normal operation, toggle the ENA signal or reset VDDA. 6. Normal Operation 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. The approximate operating frequency calculated by the following equation. is 5 9.53 x10 fop = [KHz] RCT [KΩ]*CCT[pF] 4. Ignition When the VDDA voltage exceeds the undervoltage lockout threshold, the IC is enabled an internal striking timer is activated. The approximate striking frequency is calculated by the following equation. 3812/ RCT [KΩ] + 26 fst = X1000 [KHz] 4 *CCT[pF] 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 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 CONFIDENTIAL 7. Open Lamp Protection The approximate shutdown delay calculated by the following equation. time is Td [Sec] = 0.33 XCTIMER [uF] OZ9939-DS-1.1 Page 6 OZ9939 Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. 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 calculated by the following equation. time is 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 CONFIDENTIAL OZ9939-DS-1.1 Figure 2 Page 8 OZ9939 Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. PACKAGE INFORMATION – 16-PIN SOP: OZ9939G (150mil) D E H A B e A1 C α L DIM A A1 B C D E e H L α CONFIDENTIAL OZ9939-DS-1.1 INCHES MIN MAX 0.0532 0.0688 0.0040 0.0098 0.013 0.020 0.0075 0.0098 0.3859 0.3937 0.1497 0.1574 0.050 BCS. 0.244 0.2284 0 0.016 0.050 0° 8° MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 9.80 10.00 3.80 4.00 1.27 BCS. 5.80 6.20 0.40 0° 1.27 8° Page 9 Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. OZ9939 PACKAGE INFORMATION – 16-PIN DIP: OZ9939D (300mil) CONFIDENTIAL OZ9939-DS-1.1 Page 10 OZ9939 Controlled Recipient #106805 printed on 3/6/2006. Updates will be provided to registered recipients. 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