RangeMAX™ I N T E G R A T E D P R O D U C T S LXM1615-03-xx 3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION RangeMAX Wide Range Dimming VBATT – Single Li-Ion Cell Operation Or Fixed 5V Easy to Use Brightness Control Output Short-Circuit Protection and Automatic Strike-Voltage Regulation Fixed Frequency Operation bs ol et e The resultant “burst drive” that energizes the lamp was designed specifically to ensure that no premature lamp degradation occurs (See the “How RangeMAX Works” section). VBATT Voltage Range. The modules convert the DC voltage from a single liion battery (3.2-4.2V) or a fixed 5V supply directly to high-frequency, highvoltage waves required to ignite and operate CCFL lamps. Direct Drive Technology. The modules design is based on a new Direct Drive topology, which provides a number of cost and performance advantages. Additional Features. Other benefits of this new topology are fixed-frequency operation, secondary-side strike-voltage regulation and both open and shorted lamp protection. APPLICATIONS PDA And Sub-Notebook Computers Portable Instrumentation Target 8.4” And Smaller Panels WWW . Microsemi .C OM RangeMAX™ Wide Range Dimming, Single Output Inverter. The LXM1615 series of Direct Drive CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically designed for driving 8.4” and smaller LCD backlight lamps. They also target portable displays that rely on a single lithium-ion battery. LXM1615 modules provide the designer with a vastly superior display brightness range. This brightness range is achievable with virtually any LCD display. RangeMAX Digital Dimming Technique. Digital dimming provides flicker-free brightness control in any wide range (100:1+) dimming application. The modules are available with a dimming input that permits brightness control from either a DC voltage source or a PWM signal. BENEFITS Smooth, Flicker Free 1-100% Full-Range Brightness Control Output Open Circuit Voltage Regulation Minimizes Corona Discharge For High Reliability Power Efficient, “Low Brightness” Capability Allows For Advanced Power Management IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Protected by U.S. Patents: 5,923,129; 5,930,121; Patents Pending PRODUCT HIGHLIGHT 3.2 - 4.2V Li-Ion Battery PDAs, Digital Cameras, Video Camcorder, Instrumentation, Handheld GPS FOR LOWER VOLTAGE LAMPS LXM1615 O VBATT 4.5 - 5.5V CCFL 260 - 380VRMS VLAMP Instrumentation, Sub Notebooks, Digital Picture Frames FOR HIGHER VOLTAGE LAMPS CCFL 350 - 515VRMS MODULE ORDER INFO PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO PANEL CONNECTORS LXM1615-03-01 LXM1615-03-02 LXM1615-03-03 LXM1615-03-04 JST SM02(8.0)B-BHS-1-TB or Yeon Ho 20015WR-05A00 JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00 Honda QZ-19-A3MYL #02 JST SM02(4.0)B-BHS-1-TB BHR-03VS-1 BHSR-02VS-1 Honda QZ-19-3F01 BHR-02VS-1 Copyright © 2000 Rev. 1.0a, 2005-01-14 LXM1615-03-XX ONE INVERTER SUPPORTS EITHER VOLTAGE RANGE Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 RangeMAX™ I N T E G R A T E D LXM1615-03-xx 3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE P R O D U C T S P RODUCTION D ATA S HEET ABSOLUTE MAXIMUM RATINGS WWW . Microsemi .C OM Note: bs ol et e Input Supply Voltage (VBATT) .............................................................................................................................. -0.3V to 6.5V Input Supply Voltage 3.3V (+3.3) ....................................................................................................................... -0.3V to 5.5V Output Voltage, no load........................................................................................................... Internally Limited to 1800VRMS Output Current ..........................................................................................................................4.5mARMS (Internally Limited) Output Power ................................................................................................................................................................. 2.1W Input Signal Voltage (BRITE Input) ..........................................................................................................-0.3V to 3.3V +0.3V Input Signal Voltage (SYNC)....................................................................................................................-0.3V to 3.3V +0.3V Ambient Operating Temperature, zero airflow...................................................................................................... 0°C to 70°C Storage Temperature Range.............................................................................................................................-40°C to 85°C Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal. RECOMMENDED OPERATING CONDITIONS This module has been designed to operate over a wide range of input and output conditions. However, best efficiency and performance will be obtained if the module is operated under the condition listed in the ‘R.C.’ Column. Min. and Max. columns indicate values beyond which the inverter, although operational, will not function optimally. Parameter Recommended Operating Conditions Min R.C. Max Symbol Input Supply Voltage (+3.3V) VBATT Voltage Range (VBATT = 3.6V) VBATT Voltage Range (VBATT = 5.0V) Output Power (VBATT = 3.6V) Output Power (VBATT = 5.0V) Brightness Control Input Voltage Range Lamp Operating Voltage (VBATT = 3.6V) Lamp Operating Voltage (VBATT = 5.0V) Lamp Current (Full Brightness) Operating Ambient Temperature Range +3.3 VBATT VBATT PO PO VBRT_ADJ VLAMP VLAMP IOLAMP TA 3.1 3.2 4.5 1 1.5 0.0 260 350 3.3 3.6 5.0 1.2 1.7 Units 3.5 4.2 5.5 1.5 2 2.2 380 515 305 445 4.0 0 V V V W W V VRMS VRMS mARMS °C 70 ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1615-03-xx. Parameter OUTPUT PIN CHARACTERISTICS Full Bright Lamp Current Min. Average Lamp Current (Note 2) Lamp Start Voltage Operating Frequency BRITE INPUT Linear Dim Control Range ` Input Current ` Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current +3.3V RUN Mode OFF Mode Input Current ` VSYNC CHARACTERISTICS Logic High Threshold Logic Low Threshold Input Impedance Input Frequency Free Run Frequency Copyright © 2000 Rev. 1.0a, 2005-01-14 IL(MAX) IL(MIN) VLS FO LXM1615-03-xx Min Typ Max Test Conditions VBRT_ADJ = 0V, VBATT = 3.6V or 5V VBRT_ADJ = 2.2VDC, VBATT = 3.6V or 5V VBATT=3.2 –4.2V or 4.5V to 5.5V VBRT_ADJ = 0VDC 3.5 1250 80 VBRT_ADJ = 0VDC VBRT_ADJ = 2.5VDC IO(LAMP) = 100% Duty Cycle IO(LAMP) = Minimum Duty Cycle .25 -21 250 0 2.2 ENABLE DISABLE IINRUN IINPK +3.3V = High +3.3V = Low 3.1 -0.3 VSYNC (HI) VSYNC (LO) ZIN FVSYNC FBURST +3.3V = 3.3V ± 5% +3.3V = 3.3V ± 5% VBRT IBRT VBRT_ADJ VBRT_ADJ +3.3V ± 5% 4.0 .08 1400 90 -27 268 3.3 0.0 10 100 4.5 1800 100 mARMS mARMS VRMS KHz 2.2 -41 290 .25 2.5 VDC µADC µADC VDC VDC 3.5 2.7 20 VDC VDC 2.2 .8 10 45 Output Burst Rate; VSYNC=0V Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 400 530 Units mA VDC VDC KΩ Hz Hz Page 2 ELECTRICALS O ` Symbol RangeMAX™ I N T E G R A T E D LXM1615-03-xx 3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE P R O D U C T S P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS (CONTINUED) Parameter ` Symbol Test Conditions POWER CHARACTERISTICS Run Current VBATT= 3.6VDC Run Current VBATT= 5.0VDC LXM1615-03-xx Min Typ Max Units 360 405 mA mA VBRT_ADJ = 0V, VLAMP = 270VRMS VBRT_ADJ = 0V, VLAMP = 420VRMS Note 2: Minimum lamp current required to maintain even light output may vary with display panel. bs ol et e Average RMS current = (burst duty cycle) × (burst amplitude of 4.0mARMS) FUNCTIONAL PIN DESCRIPTION Conn. Pin Description WWW . Microsemi .C OM Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1615-03-xx. CN1 (Molex 53261-0590)* CN1-1 VBATT Main Input Power Supply (3.2V to 5.5V) CN1-2 GND Power Supply Return CN1-3 +3.3V +3.3V Logic Input CN1-4 BRITE Brightness Control (0.25- 2.2VDC) 0.25VDC gives maximum lamp current CN1-5 VSYNC Vertical Synchronization Input 3.3V Logic Level (45 < fSYNC < 400Hz) CN2 for LXM1615-03-01,-02,-04 (JST SM02(8.0)B-BHS-1-TB | Yeon Ho 20015WR-05A00, SM02B-BHSS-1-TB | Yeon Ho 35001WR02A00, or SM02(4.0)B-BHS-1-TB) High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead length. CN2-1 VHI DO NOT connect to Ground. Connection to Low Side of Lamp. Connect to lamp terminal with longer lead length. CN2-2 VLO DO NOT connect to Ground. CN2 for LXM1615-03-03 (Honda QZ-19-A3MYL#02) High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead length. CN2-3 VHI DO NOT connect to Ground. Connection to Lower Side of Lamp. Connect to lamp terminal with longer lead length. CN2-1 VLO DO NOT connect to Ground. * LX9506 Mating Connector Assembly Available PHYSICAL DIMENSIONS 94mm O 3.70in X CN1 15mm 2.5mm 12.5mm 0.492in 0.591in. 0.0984in. CN2 10mm 0.394in. GROUNDED MOUNTING HOLE 3.18MM ±0.08 DIA. 69mm ±0.2mm 2.71in. 1.0mm 4.6mm Max 0.0394in. R1.0 Copyright © 2000 Rev. 1.0a, 2005-01-14 0.181in. PCB tolerances ± 0.5mm, M2 or 2-56 recommended mounting screws Warning High Voltage Present at high side of transformer Weight: (5.5g) typ. and Output Connector Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 PACKAGE DATA W RangeMAX™ I N T E G R A T E D LXM1615-03-xx 3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE P R O D U C T S P RODUCTION D ATA S HEET WWW . Microsemi .C OM HOW THE RANGEMAX WORKS bs ol et e LAMP VOLTAGE & LAMP CURRENT – BURST MODE OPERATION Figure 1 – 50% Burst Duty Cycle Figure 2 – 2% Burst Duty Cycle Rather than using the traditional dimming technique of varying lamp current magnitude to adjust light output, RangeMAX inverters use a fixed lamp current value with a duty cycle control method. The lamp current burst width can be modulated from 100% (continuous lamp current) down to a 2% duty cycle, allowing the lamp to be dimmed to less than 1% of its full brightness. As can be seen in Trace 4 of Figure 3 photo at right, careful design consideration was given to controlling lamp start voltage to softly start current flow. This eliminates current overshoot that can result in premature cathode wear and reduce lamp life. Figure 3 – 2% Burst Duty Cycle (Expanded Time Base) HIGHLIGHTS • High Voltage Transformer Comparator + Transformer Driver - .25 2.2VDC Ramp Gen. ISENSE VSENSE VLO Figure 4 – RangeMAX Simplified Block Diagram Copyright © 2000 Rev. 1.0a, 2005-01-14 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 DESCRIPTION O Ramp LAMP VBRITE VHI Integrated brightness control circuit includes a DC voltage to pulse width converter that minimizes system design work and system noise susceptibility. This provides a familiar and convenient interface while reducing the potential for externally induced noise, which can cause lamp flicker. • RangeMAX inverter modules are designed to operate with the burst frequency synchronized to the video frame rate. This provides operation with no visible display disturbances caused by beat frequencies between the lamps and video frame rates. In this synchronous mode, the inverter burst rate operates at twice the video refresh rate, well beyond standard 50/60Hz video refresh rates where the eye can perceive pulsing light. • In applications with no access to a vertical sync, an onboard oscillator operates the inverter burst rate at about 500Hz. In this non-synchronous mode, minor display disturbances can be found under certain video conditions. This performance may be acceptable for many applications, but synchronization must be used when no disturbance can be tolerated. RangeMAX™ I N T E G R A T E D LXM1615-03-xx 3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE P R O D U C T S P RODUCTION D ATA S HEET HOW THE RANGEMAX WORKS (CONTINUED) • Separate feedback loops for lamp current and open circuit voltage regulation insure reliable strike under all operating conditions, automatic over-voltage prevention with broken or failed lamps, and accurate lamp current regulation. • A single input will accommodate negative and positive vertical sync pulses at any pulse width. TYPICAL APPLICATION • The Brightness control may be a voltage output DAC, or other voltage source as shown in Figure 5. A 3.3V Logic Level PWM signal from a micro-controller may also be used as shown in Figure 5A. • If synchronization to the video frame rate is desired, connect the vertical sync pulse from the system video controller to the VSYNC input. If no video synchronization is desired, connect VSYNC to ground. • If you need to turn the inverter ON/OFF remotely, use the +3.3V Logic Supply pin. • Connect VHI to high voltage wire from the lamp. Connect VLO to the low voltage wire (wire with thinner insulation). Never connect VLO to circuit ground as this will defeat lamp current regulation. If both lamp wires have heavy high voltage insulation, connect the longest wire to VLO. This wire is typically white. bs ol et e 3.2V - 4.2V or 5V 3.3V DC BRITE +3.3V V BAT T V HI CCFL TUBE LXM1615-03-xx SYNC G ND V LO V SYNC Figure 5 - Brightness Control Error! Not a valid link. WWW . Microsemi .C OM HIGHLIGHTS (CONTINUED) RangeMAX INVERTERS Also available in higher power single lamp inverters LXM1612-xx-xx, Dual Output LXM1621-01, LXM1622-xx-xx and Quad Output LXM1641-01 versions for multiple lamp applications. LXM1615-03-XX OUTPUT CURRENT ADJUST O The LXM1615-03-xx output current can be adjusted lower by changing the value of one resistor (R10) on the PCB. The following table shows the new output current values: Copyright © 2000 Rev. 1.0a, 2005-01-14 137K 1% (stock setting) 95.3K1% 68.1K1% 49.9K1% 36.5K1% APPLICATION 4.0mArms 3.5mArms 3.0mArms 2.5mArms 2.0mArms Error! Not a valid link. Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 RangeMAX™ I N T E G R A T E D P R O D U C T S LXM1615-03-xx 3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE P RODUCTION D ATA S HEET O bs ol et e WWW . Microsemi .C OM NOTES NOTES PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright © 2000 Rev. 1.0a, 2005-01-14 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6