RangeMAX I N T E G R A T E D LXM1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE P R O D U C T S P RELIMINARY D ATA S HEET KEY FEATURES DESCRIPTION Incorporation of a video synchronization feature allows wide ratio dimming without the display disturbances and interference seen with competitive products. The modules are equipped with a dimming input that permits brightness control from an external potentiometer or DC voltage source. 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). The module design is based on a new Direct Drive topology, which provides a number of cost and performance advantages. Linfinity’s multiple lamp inverters include a built in connector array for the most common LCD lamp configurations. Other benefits of this new topology are fixed-frequency operation and secondaryside strike-voltage regulation. The LXM1621 is fully customizable (electronically and mechanically) to specific customer requirements. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com APPLICATIONS WWW . Microsemi .C OM The LXM1621 Direct Drive™ CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically designed for driving two lamp LCD backlight displays. Similar to the LXM1620, the LXM1621 excels in applications where critical parameters include very wide range dimmability, high efficiency, and reliable fail-safe design in a small form factor. These 12 volt modules are specifically designed with desktop and industrial applications in mind. Unlike the LXM1620 or any traditional dimming CCFL inverters, the LXM1621 provides the designer a vastly superior display brightness range. 100:1+ brightness range is achievable with a standard LCD display (see Product Highlight). Our wide range dimming provides exceptional display readability at less than 1% of full brightness, allowing both power savings and low ambient light operating capability(i.e. “night readable”). Digital dimming provides flicker-free brightness control in any wide-range dimming application. RangeMAX Wide Range Dimming 8V to 16V Input Voltage Range Small Form Factor Easy To Use Brightness Control MicroAmp SLEEP Mode Output Short-Circuit Protection And Automatic Strike-Voltage Regulation Fixed Frequency Operation Universal Connector Configuration Hi-Brite Displays Desktop Displays Low Ambient Light Conditions (i.e. Aircraft Cabins, Automobile) Industrial Applications BENEFITS High Efficiency Reduces Heating Problems Smooth, Flicker Free 0-100% FullRange Brightness Control Gives Your Product A High Quality Image Output Open Circuit Voltage Regulation Minimizes Corona Discharge For Long Life And High Reliability Power Efficient, “Low Brightness” Capability Allows For Advanced Power Management PRODUCT HIGHLIGHT D C V oltage S o urce P o tentiom eter BRITE 1 W W 2 2 2 LXM1621-XX 3 1 3 1 3 W U N IV E R S A L D IM M IN G I N P U T V DC OR P O T E N T IO M E T E R MODULE ORDER INFO PART NUMBER LAMP CURRENT LXM1621-01 LXM1621-02 LXM1621-03 LXM1621-04 Copyright 2000 Rev. 0.7d, 2003-01-20 7mA 6mA 6.5mA 5mA LAMP RUN VOLTAGE (RMS) 500-750 350-550 350-550 470-640 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 LXM1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE P R O D U C T S P RELIMINARY D ATA S HEET ABSOLUTE MAXIMUM RATINGS (NOTE 1) WWW . Microsemi .C OM Input Supply Voltage (VIN)................................................................................................................................-0.3V to 18V Output Voltage, no load....................................................................................................... Internally Limited to 1800VRMS Output Current ........................................................................................................................10mARMS (Internally Limited) Output Power (per lamp) .................................................................................................................................................. 6W Input Signal Voltage (BRITE Input).................................................................................................................-0.3V to 6.5V Input Signal Voltage ( SLEEP , VSYNC)............................................................................................................... -0.3V to VIN Ambient Operating Temperature, zero airflow................................................................................................... 0°C to 70°C Storage Temperature Range............................................................................................................................. -40°C to 85°C Note 1: 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 Range (Functional) Input Supply Voltage (Fully Regulated Lamp Current) Output Power (Per Lamp) LXM1621-01 LXM1621-02 / 03 LXM1621-04 Brightness Control Input Voltage Range Lamp Operating Voltage LXM1621-01 LXM1621-02 / 03 LXM1621-04 Lamp Current LXM1621-01 (Full Brightness – Per Lamp) LXM1621-02 LXM1621-03 LXM1621-04 Operating Ambient Temperature Range VIN 8 10.2 PO VBRT_ADJ 0.0 500 350 470 VLAMP IOLAMP TA 12 12 4 2.5 2.75 Units 16 13.8 5 3 3.5 2.5 750 500 640 625 425 550 7.0 6.0 6.5 5.0 0 V V W W W V VRMS VRMS VRMS mARMS mARMS mARMS MARMS °C 70 ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LMX1621-xx. Parameter ` Symbol Test Conditions LXM1621-xx Min Typ Max Units OUTPUT PIN CHARACTERISTICS Full Brightness Current LXM1621-01 IL(MAX) LXM1621-03 LXM1621-04 Minimum Lamp Current (Per Lamp) (Notes 2 & 3) Lamp Start Voltage Operating Frequency Copyright 2000 Rev. 0.7d, 2003-01-20 IL(MIN) VLS fO Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 6.3 7.0 7.7 mARMS 5.5 6.0 6.5 mARMS 5.7 6.5 7.1 mARMS 4.5 5.0 5.5 mARMS 0.14 mARMS 0.035 mARMS 1500 52 57 1800 VRMS 62 kHz Page 2 ELECTRICALS LXM1621-02 VBRT_ADJ = 2.5VDC, SLEEP = HIGH, Burst Duty = 100%, VIN = 12VDC VBRT_ADJ = 2.5VDC, SLEEP = HIGH, Burst Duty = 100%, VIN = 12VDC VBRT_ADJ = 2.5VDC, SLEEP = HIGH, Burst Duty = 100%, VIN = 12VDC VBRT_ADJ = 2.5VDC, SLEEP = HIGH, Burst Duty = 100%, VIN = 12VDC VBRT_ADJ = 0VDC, SLEEP = HIGH, Burst Duty = 2%, VIN = 9VDC VBRT_ADJ = -50mVDC, SLEEP = HIGH, Burst Duty =0.5%, VIN = 9VDC 0°C < TA < 40°C, VIN > 10.8VDC VBRT_ADJ = 2.5VDC, SLEEP = HIGH, VIN = 12VDC RangeMAX I N T E G R A T E D LXM1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE P R O D U C T S P RELIMINARY D ATA S HEET ELECTRICAL CHARACTERISTICS (CONTINUED) Parameter ` ` ` Test Conditions BRITE INPUT Input Current IBRT VBRT_ADJ = 0V Input Voltage For Max. Lamp Current VC IO(LAMP) = 100% Duty Cycle Input Voltage For Min. Lamp Current (Note 3) VC LMX1621-xx Min Typ Max -6 IO(LAMP) = 2% Duty Cycle IO(LAMP) = 0.5% Duty Cycle Units -8 -10 µADC 2.5 2.6 VDC 0 0 -50 VDC mVDC SLEEP INPUT RUN Mode VSLEEP(HI) 2.2 VIN VDC SLEEP Mode VSLEEP(LO) -0.3 0.8 VDC Input Current ISLEEP 100 µADC 6.5 VDC 1.0 VDC 75 KΩ SLEEP = 5.0V 70 75 VSYNC CHARACTERISTICS Logic High Level VSYNC(HI) 4.0 Logic Low Level VSYNC(LO) -0.3 Input Impedance ZIN 60 Pulse Width (Note 4) tPW 25 250 µs fSYNC 49 150 Hz 50 µADC Input Frequency ` Symbol WWW . Microsemi .C OM Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LMX1621-xx. 66 POWER CHARACTERISTICS Sleep Current IIN(MIN) VIN = 12VDC, SLEEP < 0.8V 5 Note 2: Minimum lamp current required to maintain even light output may vary with display panel. Note 3: See 200:1 Dimming Application section for details. Note 4: The module will be functional with pulse widths much larger than 250µs. FUNCTIONAL PIN DESCRIPTION Conn. Pin Description CN1 CN1-1 VIN Input Power Supply (8V < VIN < 16V) CN1-2 CN1-3 GND Power Supply Return CN1-4 SLEEP ON / OFF Control. (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF) CN1-6 BRITE Brightness Control (-0.3V to 2.5VDC). 2.5VDC gives maximum lamp current. CN1-7, 8 VSYNC Vertical synchronization input 49Hz < fSYNC < 150Hz ELECTRICALS CN1-5 CN2 thru CN5: Refer to Connection Schematic Section Copyright 2000 Rev. 0.7d, 2003-01-20 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 RangeMAX I N T E G R A T E D P R O D U C T S LXM1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE P RELIMINARY D ATA S HEET PHYSICAL DIMENSIONS WWW . Microsemi .C OM LXM1621-01 / 02 / 03 4.88 in (124mm) CN2, CN3 CN1 1.26 in. 0.24 in W (32mm) (6mm) CN4 CN5 1.50 in 1.89 in (38mm) (48mm) ∅0.12(3.0mm ±0.08) Grounded Mounting Hole - 2plcs Warning High Voltage Present at all Output Connectors 0.34 in 0.60 in (8.6mm) (1.52mm) CN4 CN5 PCB tolerances ±0.5mm CN2 Backside Connectors W W CN3 Weight: 23(g) typ. LXM1621-04 4.88 in (124mm) CN1 CN2, CN3 1.26 in. 0.24 in (32mm) 6mm W 1.50 in 1.89 in (38mm) (48mm) ∅0.12(3.0mm ±0.08) Grounded Mounting Hole - 2plcs (1.52mm) PCB tolerances ±0.5mm MECHANICALS Warning High Voltage Present at all Output Connectors 0.60 in CN2 Backside Connectors CN3 Weight: 23 (g) typ. All dimensions are in inches (mm) Copyright 2000 Rev. 0.7d, 2003-01-20 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 RangeMAX I N T E G R A T E D P R O D U C T S LXM1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE P RELIMINARY D ATA S HEET WWW . Microsemi .C OM TYPICAL CONNECTION CONFIGURATIONS CN1 CCFL Lamps LXM1621-01 / 02 /03 CN1 CN5 CN4 LXM1621-01 / 02 /03 CN5 CN4 CCFL Lamps Desktop Display Desktop Display CN1 LXM1621-01 / 02 /03 CN1 CN5 CCFL Lamps LXM 1621-01 / 02 /03 CN3 CN2 CN4 CCFL Lamps Desktop Display Desktop Display CN3 LXM1621-04 CN1 CN3 LXM1621-04 CN1 CCFL Lamps CN2 CCFL Lamps CN2 Desktop Display Desktop Display Figure 1 – Connectivity Configuration Examples These examples illustrate six typical LCD wiring configurations that are accommodated by Linfinity’s unique connector array. Linfinity inverters have multiple lamp connector styles that re common to the industry, which are duplicated at both ends of the module. This permits over 14 variations of module mounting and interconnectivity configuration. Copyright 2000 Rev. 0.7d, 2003-01-20 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 PACKAGE DATA * Connectors CN2 and CN3 are on the bottom side of the inverter. View shown is looking through the board RangeMAX I N T E G R A T E D LXM1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE P R O D U C T S P RELIMINARY D ATA S HEET WWW . Microsemi .C OM CONNECTION SCHEMATIC CN1 N.C. VHI1 VHI2 1 2 3 N.C. Inverter Output 2 W W CN4 4 3 2 1 Inverter Output 1 CN2 1 W 2 3 4 CN3 3 2 1W CN5 Figure 2a – LXM1621-01 / 02 / 03 Connection Schematic CN1 VHI1 CN2 3 2 1 CN3 Inverter Output 2 Inverter Output 1 VHI2 1W 2 3 W Figure 2b – LXM1621-04 Connection Schematic Connectors: Mates With CN1 Molex 53261-0890 *Loose(-8000, Chain) Recommended #26 AwG wiring Pins: 50079-8100*, Housing: 51021-0800 CN2, CN3 JST SM04(4.0)B-BHS-1-TB JST BHR-04VS-1 CN4, CN5 JST SM03(4.0)B-BHS-1-TB JST BHR-03VS-1 PACKAGE DATA Connection Rules 1. Always install two (2) lamps. Operating with only one lamp may overdrive lamp current at maximum brightness settings. 2. Verify lamp wiring before connecting lamps to the inverter module. Connecting both lamps to one of the two inverter output circuits will result in reduced brightness. The LXM1621-01 / 02 / 03 module connectors are wired per industry standard. The lamp hot wires (high voltage wires) are always on pin 1 or 2, and the cold wire (low voltage wire) is always on pin 3 or 4. 3. The LXM1621-04 uses the reverse pinout found in some panels. The lamp hot wires (high voltage wires) are on pins 2 and 3 and the cold (low voltage wire) is on pin 1. Copyright 2000 Rev. 0.7d, 2003-01-20 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 RangeMAX I N T E G R A T E D LXM1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE P R O D U C T S P RELIMINARY D ATA S HEET HOW THE RANGEMAX WORKS WWW . Microsemi .C OM LAMP VOLTAGE & LAMP CURRENT – BURST MODE OPERATION Figure 3 – 50% Burst Duty Cycle Figure 4 – 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 3 of Figure 5 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 5 – 2% Burst Duty Cycle (Expanded Time Base) High Voltage Transformer Comparator 0.25 2.2VDC Ramp HIGHLIGHTS • + LAMP VBRITE VHI - Ramp Gen. Transformer Driver VLO VHI LAMP VSYNC ISENSE VLO Figure 6 – RangeMAX Simplified Block Diagram Copyright 2000 Rev. 0.7d, 2003-01-20 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 DESCRIPTION VSENSE 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. • An on-board oscillator operates the inverter BURST rate about 95Hz, well beyond standard 50/60Hz video refresh rates where the eye can perceive pulsing light. • 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. RangeMAX I N T E G R A T E D LXM1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE P R O D U C T S P RELIMINARY D ATA S HEET HOW THE RANGEMAX WORKS (CONTINUED) • In applications with no access to a vertical sync, the inverter burst frequency can be allowed to “free run” at 95Hz. In this non-synchronous mode, minor display disturbances may be found under certain video conditions. This performance is acceptable for many applications, but synchronization must be used when no disturbance can be tolerated. • 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. TYPICAL APPLICATION • The brightness control may be a simple 10k potentiometer or a voltage output DAC. A PWM signal from a microcontroller may also be used with a suitable filter such as shown in figure 8. • If synchronization to the video frame rate is desired, connect the vertical sync pulse from the system video controller to the appropriate VSYNC input. If no video synchronization is desired, connect VSYNC to ground. • If you need to turn the inverter ON/OFF remotely, connect a 3V or 5V logic signal to the SLEEP input. If remote ON/OFF is not needed, connect the SLEEP input to VIN or any other voltage greater than 2.2VDC. • Connect VHI to high voltage wire from the lamp. Connect VLO to the low voltage wire (wire with thinner insulation). If both lamp wires have heavy high voltage insulation, connect the longest wire to VLO. VLO is connected directly to ground (GND pin) on the inverter PCB. Always insure a good lamp return by using a wire. Do not rely on a chassis ground connection. 12V 2.5VDC < 10k BRITE VHI2 VHI1 VIN LXM1621-xx 0 5V SLEEP VSYNC GND VLO VSYNC Figure 7- Brightness Control PWM Signal 4.99k from System 4.99k* BRITE 4.7µF P.W. LXM1621-xx RangeMAX INVERTERS Also available in single lamp inverters are the LXM1612-xx-xx or LXM1615-xx-xx, as well as the 12V dual lamp LXM1621-12-xx, LXM1622-xx-xx, and the Quad output LXM1641-01 versions for multiple lamp applications. < 100µs 0 < P.W. < 100% of period * use 4.99k for 5V PWM amplitude, 15k for 3.3V PWM amplitude, and omit for 2.5V PWM amplitute. APPLICATIONS Figure 8 - PWM Brightness Control Copyright 2000 Rev. 0.7d, 2003-01-20 WWW . Microsemi .C OM HIGHLIGHTS (CONTINUED) Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 RangeMAX I N T E G R A T E D P R O D U C T S LXM1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE P RELIMINARY D ATA S HEET WWW . Microsemi .C OM WIDER DIMMING APPLICATION Wide ratio (250:1) dimming can be accomplished using the Linfinity inverter in two ways: 7 IOLAMP(mA) The following application defines techniques capable of delivering dimming ranges in the 250:1 range. As is widely understood, these techniques will provide general capabilities and actual system performance will vary with panel design, CCFTs, ambient temperature and a number of other variables outside the control of the inverter. These methods can be used in conjunction with other techniques such as lamp heating and matching. 0.7 .14 .070 -100mV 0V 2.5V VBRT_ADJ(V) R50 R56 R55 R52 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9 APPLICATIONS Copyright 2000 Rev. 0.7d, 2003-01-20 C39 R49 R22 C35 R59 R58 C33 C32 C30 CN2 1. By varying the input voltage on the brightness pin as indicated in Figure 9. Caution must be exercised when Figure 9 – Average Lamp Current vs. VBRITE Voltage (per Lamp) applying negative voltage to the brightness control input. Applying more then –300mV to any inverter input will cause inverter malfunction (see Absolute Maximum Ratings). 2. By making a resistor value change on the module. Remove R61 for maximum dimming range or increase R61 value to desired minimum dim range setting (see figure 10). Care should be exercised since at a low enough dim setting the inverter will be unable to detect that the lamp has started and will initiate lamp strike (kickoff) voltage. This will result in lamp flicker. For repeatable low light levels the BRITE input Backside of Module DC supply must be a very clean stable voltage source, at low dim inputs. R63 R51 If you plan to completely remove R61 it is recommended that R60 R62 you ensure that a minimum voltage above zero remain on the R61 R31 BRITE input to prevent the above flicker problem. This U9 U7 Q10 minimum voltage may need to be adjusted for each individual R57 inverter module. If you are using a pot to control the BRITE R54 R53 input then a separate trim pot on the low side would accomplish Q11 T1 R48 R89 the same goal. C37 Both methods discussed will provide a lower duty cycle operation than is necessary in a 100:1 dimming application. Figure 10 – Locating The Resistor on the LXM1621-xx Careful consideration should be made with regard to display quality at these dimming levels. At very low brightness levels, even very small amounts of noise on the VBRITE line can cause flicker on the display, so special care must be given to grounding, filtering, and shielding the inverter from the digital logic and clock signals. RangeMAX I N T E G R A T E D P R O D U C T S LXM1621-xx DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE P RELIMINARY D ATA S HEET WWW . Microsemi .C OM NOTES NOTES Preliminary Data – Information contained in this document is pre-production data and is proprietary to LinFinity. It may not be modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form only and LinFinity reserves the right to change or discontinue this proposed product at any time. Copyright 2000 Rev. 0.7d, 2003-01-20 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 10