RangeMAX I N T E G R A T E D LXM1622-12-xx DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE P R O D U C T S P RELIMINARY D ATA S HEET KEY FEATURES DESCRIPTION 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). Input Voltage Range. The modules convert the DC voltage from a fixed 12V supply directly to high frequency, highvoltage waves required to ignite and operate CCFL lamps. A 5V input inverter is also available; LXM1612-05 series. 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. If lamp fails to strike the inverter will timeout and shutdown. RangeMAX Wide Range Dimming Fixed 5V input Easy to Use Brightness Control Output Short-Circuit Protection and Automatic Strike-Voltage Regulation and Timeout Fixed Frequency Operation Microamp SLEEP mode APPLICATIONS Notebook Sub-Notebook Computers Portable Instrumentation Low Ambient Light WWW . Microsemi .C OM RangeMAX Wide Range Dimming, Dual Output Inverter. The LMX1622 series of Direct Drive CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically designed for driving two lamp LCD displays. They are available in two power and input voltage ranges. LMX1622 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 PRODUCT HIGHLIGHT D C V o lta g e S o u rc e P o te n tio m e te r PW M S ig n a l 1 3 2 2 BRITE W 1 3 U N IV E R S A L PART NUMBER LAMP CURRENT LXM1622-12-01 LXM1622-12-02 LXM1622-12-03 Copyright 2000 Rev. 0.3f, 2003-01-20 6.5mA 5.5mA 5.5mA D C , O R IM M IN G P IN PU T O T E N T IO M E T E R MODULE ORDER INFO LAMP RUN OUTPUT CONNECTOR VOLTAGE 500-750 350-550 350-550 LXM1622-12-XX "P W M ", V D W INVERTER MATES DIRECTLY TO PANEL CONNECTORS JST SM02(8.0)B-BHS-1-TB JST SM02(8.0)B-BHS-1-TB Honda QZ-19-A3MYL #02 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 BHR-03VS-1 BHR-03VS-1 QZ-19-3F01 Page 1 RangeMAX I N T E G R A T E D LXM1622-12-xx DUAL 5W, DIGITAL DIMMING 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 16V Output Voltage, no load........................................................................................................... Internally Limited to 1800VRMS Output Current...........................................................................................................................7.5mARMS (Internally Limited) Output Power (for 2 lamps) ............................................................................................................................................. 12W Input Signal Voltage (BRITE , VSYNC Input) ......................................................................................................-0.3V to +6.5V Input Signal Voltage (SLEEP) .................................................................................................................... -0.3V to VIN +0.5V 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 VIN Voltage Range Output Power (-01) Output Power (-02,-03) Brightness Control Input Voltage Range Lamp Operating Voltage (-01) Lamp Operating Voltage (-02,-03) Lamp Current Full Brightness (-01) Lamp Current Full Brightness (-02,-03) Operating Ambient Temperature Range VIN PO PO 10.8 5.8 3 0.0 500 300 VBRT_ADJ VLAMP VLAMP IOLAMP IOLAMP TA 12.0 8 5 13.2 10.8 6 2.5 750 500 625 425 6.5 5.5 0 70 Units V W W V VRMS VRMS mARMS mARMS °C ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LMX1622-12-xx. Parameter ` ` OUTPUT PIN CHARACTERISTICS Full Bright Lamp Current (-01) Full Bright Lamp Current (-02,-03) Min. Average Lamp Current (Note 2) Lamp Start Voltage Operating Frequency Fault Timeout BRITE INPUT Linear Dim Control Range Input Current Copyright 2000 Rev. 0.3f, 2003-01-20 VBRT_ADJ VBRT_ADJ VSLEEP VSLEEP IISLEEP VSYNC CHARACTERISTICS Logic High Level Logic Low Level Input Impedance Input Frequency Free Run Frequency VBRT_ADJ = 2.25V VBRT_ADJ = 2.25V VBRT_ADJ = 0VDC VSYNC (HI) VSYNC (LO) ZIN FVSYNC FBURST LXM1622-12-xx Min Typ Max 5.85 4.95 VBRT_ADJ = 2.25VDC 1350 66 VBRT_ADJ = 0VDC VBRT_ADJ = 2.5VDC IO(LAMP) = 100% Duty Cycle IO(LAMP) = Minimum Duty Cycle .25 -680 196 2.25 0 VBRT IBRT Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current SLEEP INPUT RUN Mode OFF Mode Input Current ` IL(MAX) IL(MAX) IL(MIN) VLS FO TFAULT Test Conditions VIN=12V VIN=12V SLEEP=5.0V SLEEP=0.0V 1.5 -0.3 400 VIN=12V VIN=12V 1.5 0 Output Burst Rate; VSYNC=0V 50 190 6.5 5.5 .25 1500 76 1.6 -710 203 425 0 7.15 6.05 1800 86 2.2 -730 220 2.5 0.25 0.8 450 0.8 27 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 250 150 310 Units mARMS mARMS mARMS VRMS KHz SEC VDC µADC µADC VDC VDC VDC VDC uA VDC VDC KΩ Hz Hz Page 2 ELECTRICALS ` Symbol RangeMAX I N T E G R A T E D LXM1622-12-xx DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE P R O D U C T S P RELIMINARY D ATA S HEET ELECTRICAL CHARACTERISTICS (CONTINUED) Parameter ` Symbol POWER CHARACTERISTICS Run Current (LXM1622-12-01) Run Current (LXM1622-12-02,03)) Sleep Current IRUN IRUN ISLEEP Test Conditions VIN=12V,VBRT_ADJ = 2.25V, VLAMP = 625VRMS VIN=12V,VBRT_ADJ = 2.25V, VLAMP = 425VRMS VIN = 12V, SLEEP = 0.0V LMX1622-12-xx Min Typ Max Units 800 450 0.5 mA mA µA 0.0 10 Note 2: Minimum lamp current required to maintain even light output may vary with display panel. Average RMS current = (burst duty cycle) X (burst amplitude of full lamp current FUNCTIONAL PIN DESCRIPTION Conn. Pin WWW . Microsemi .C OM Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LMX1622-12-xx. Description CN1 (Molex 53261-0890) * CN1-1,2 VIN Main Input Power Supply (10.8V to 13.2V) CN1-3,4 GND Power Supply Return SLEEP CN1-5 >1.5V(Backlight on), <0.8V (backlight off), IISLEEP=425uA @ 5.0V, disabled if left open CN1-6 BRITE Brightness Control (0.25- 2.2VDC) 2.25VDC gives maximum lamp current CN1-7 BRITE RTN Signal Ground (0Vdc) CN1-8 VSYNC Vertical Synchronization Input (50 < fSYNC > 150Hz), minimum pulse width 10uS CN2,3 for LMX1622-12-01, 02 (JST SM02(8.0)B-BHS-1-TB) High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead CN2-1 VHI length. 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. CN2,3 for LMX1622-12-03 (Honda QZ-19-A3MYL#02) High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead CN2-3 VHI length. 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. * LX9501 Mating Connector Assembly Available PHYSICAL DIMENSIONS LXM1622-12-XX All dimensions are in inches (mm) 0.078in. 4.88in. 2mm 124mm 4.69in. W CN1 PACKAGE DATA CN2, CN3 (Connector Type) 119mm 1 0.068in. 1.75mm 0.118in. 3mm 1.26in. 32mm SM02(8.0)B-BHS-1-TB (JST) 3 0.118in. 3mm±0.08 CN2 1 CN3 0.24in. 6mm 1.50in. 38mm Honda QZ-19-AMYL#02 1.89in. 48mm Warning 0.060in. 1.52mm CN3 CN2 7.6mm High Voltage Present at all Output Connectors Weight: 24.5 (g) typ. All PCB Tolerances to ± 0.5mm Copyright 2000 Rev. 0.3f, 2003-01-20 .299in. 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 LXM1622-12-xx DUAL 5W, DIGITAL DIMMING 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 2 – 5% Burst Duty Cycle Figure 1 – 50% 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 5% duty cycle, allowing the lamp to be dimmed to less than 3% 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. High Voltage T ransformer VHI 5K C omparator + Ramp 0.25 2.2V D C V B R IT E - T ransformer Driver HIGHLIGHTS • LAMP + 3.5V Figure 3 – 5% Burst Duty Cycle (Expanded Time Base) V LO V HI LAMP Ramp G en. V LO V S YN C Figure 4 – RangeMAX Simplified Block Diagram Copyright 2000 Rev. 0.3f, 2003-01-20 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 DESCRIPTION V SE N SE I SE N S E 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. RangeMAX I N T E G R A T E D LXM1622-12-xx DUAL 5W, DIGITAL DIMMING 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, an onboard oscillator operates the inverter burst rate at about 270Hz. 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. • 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 WWW . Microsemi .C OM HIGHLIGHTS (CONTINUED) • +12V D C V IN BRITE V HI LXM1622-12-xx BRITE RTN 0 2.5 SLEEP V SYN C 5V GND V LO V SYNC Figure 5 - Brightness Control PW M Signal from System The Brightness control may be a voltage output DAC, digital resistor or a simple 10K potentiometer, or other voltage source, as shown in Figure 5. A 2.5V to 5V 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. CCF TUB • If you need to turn the inverter ON/OFF remotely, connect a 2.5V to 5V logic signal to the SLEEP input. If remote ON/OFF is not needed, connect the SLEEP input to VIN or other voltage source between 2.5V and 5V. • 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. RangeMAX INVERTERS BRITE P.W . LXM1622-12-xx Also available in single lamp inverters LXM1612-xxxx, 5V dual LXM1622-05-xx and Quad Output LXM1641-01 versions for multiple lamp applications. 1mS to 200µS APPLICATIONS 0 < P.W. < 100% of period Figure 5A - PW M Brightness Control Copyright 2000 Rev. 0.3f, 2003-01-20 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 LXM1622-12-xx DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE P R O D U C T S P RELIMINARY D ATA S HEET The LMX1622-12-01 output current can be adjusted lower by changing the value of one resistor (R18) on the PCB. The following table shows the new output current values: The LMX1622-12-02,03 output current can be adjusted lower by changing the value of one resistor (R18) on the PCB. Changing the value of R35 can also increase the output current. The following table shows the new output current values: Add R18 Output Current Resistor Value 6.5mArms 6.0mArms 5.5mArms 5.0mArms 4.5mArms 4.0mArms 3.5mArms 3.0mArms Not used 1.0M 5% 422K 1% 267K 1% 178K 1% 121K 1% 88.7K 1% 68.1K 1% Add R18 Output Current Resistor Value 5.5mArms 5.0mArms 4.5mArms 4.0mArms 3.5mArms 3.0mArms Not used 845K 1%, 374K 1%, 232K 1% 127K 1%, 71.5K 1% WWW . Microsemi .C OM LMX1622-12-XX OUTPUT CURRENT ADJUST Change R35 Output Current Resistor Value 5.5mArms 6.0mArms 6.5mArms 576 1% (stock value) 499 1% 442 1% DRIVING THE BRITE INPUT FROM A HIGH IMPEADANCE input from a high impedance. In this case the internal pullup resistor R44 may be removed from the board. Please use the drawing below to help locate the specified resistor. The LMX1622-12-xx comes with a built in 5K pull-up resistor to allow the use of an external potentiometer for brightness adjust. In some cases this pull-up resistor may interfere with those driving the BRITE COMPONENT DRAWING C2 CN1 C30 R54 C20 U5 C4 C5 C7 C8 R16 R14 C10 C11 R17 C9 RJ5 C6 U4 R10 R11 RJ3 R2 R12 Q1 R3 Q3 R8 R9 C12 C13 C14 R15 D8 R51 R46 R44 R50 R49 R52 R47 R48 R53 D5 R33 R35 D3 C24 Copyright 2000 Rev. 0.3f, 2003-01-20 Q4 R30 R45 RJ1 APPLICATIONS R7 U2 R36 R37 R6 R5 D1 Q2 R22 R20 R23 F1 R4 RJ2 R13 RJ4 R1 C1 C3 T1 U1 RJ6 R19 C15 C16 C17 R18 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 P R O D U C T S LXM1622-12-xx DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE P RELIMINARY D ATA S HEET WWW . Microsemi .C OM DRIVING THE BRITE INPUT FROM A HIGH IMPEADANCE 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. 0.3f, 2003-01-20 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7