LXM1612-12-XX

A MICROSEMI
 COMPANY LXM1612-12-xx 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RELIMINARY D ATASHEET
 RangeMAX Wide Range Dimming, Single Output Inverter. The LXM161212-xx series of Direct Drive™ CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically designed for driving LCD backlight lamps. RangeMAX Digital Dimming Technique. Digital Dimming provides flicker-free brightness control in any wide-range dimming application. The modules are equipped with a dimming input that permits brightness control from either an external potentiometer, DC voltage source, or PWM signal. The resultant “burst drive” that energizes the lamp was designed specifically to ensure that no premature lamp degradation occurs. Input Voltage Range. The modules convert DC voltage from the system battery or AC adapter directly to highfrequency, high-voltage waves required to ignite and operate CCFL lamps. A 5V input inverter is also available (LXM1612-05-xx). Direct Drive Technology. The module 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 and secondary-side strikevoltage regulation and all LXM1612-12xx modules feature both open and shorted lamp protection.  
RangeMAX Wide Range W W W . Microsemi . COM Dimming
9.6V to 14.4V Input Voltage
Fully Integrated Direct Drive And Dimming Control
Single Sided PCB Layout
Easy To Use Brightness Control
MicroAmp SLEEP Mode
Output Short-Circuit Protection And Automatic Strike-Voltage Regulation
Fixed Frequency Operation  
Notebook And Sub-Notebook Computers
Portable Instrumentation
Desktop Displays
Low Ambient Light IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Conditions (i.e. Aircraft Cabins, Automobile) 
   
Smooth, Flicker Free 1-100% 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 BRITE
Full-Range 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

         
 
 
 
    
    
  
 
 1 2 3 LXM1612-12 LXM1612-12  
   INVERTER MATES DIRECTLY TO PANEL CONNECTORS LXM1612-12-01 JST SM02(8.0)B-BHS-1-TB BHR-03VS-1 LXM1612-12-02 JST SM02B-BHSS-1-TB BHSR-02VS-1 LXM1612-12-03 Honda QZ-19-A3MYL #02 QZ-19-3F01 PART NUMBER OUTPUT CONNECTOR Copyright © 2000 Rev. 0.3f, 2000-12-06 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 A MICROSEMI
 COMPANY LXM1612-12-xx 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RELIMINARY D ATASHEET     
  W W W . Microsemi . COM Input Signal Voltage (VIN1) .................................................................................................................................-0.3V to 16V Output Voltage, no load..........................................................................................................Internally Limited to 1800VRMS Output Current......................................................................................................................... 8.0mARMS (Internally Limited) Output Power................................................................................................................................................................... 6.0W Input Signal Voltage (BRITE Input) ..................................................................................................................-0.3V to 5.5V Input Signal Voltage ( SLEEP , VSYNC Inputs) .....................................................................................................-0.3V to 5.5V 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. 
 CN-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7  VIN1 GND    

 
 Main Input Power Supply (9.6V < VIN1 < 14.4V) Power Supply Return ON/OFF Control. (2.1V < SLEEP < VIN1 = ON, 0V < SLEEP < 0.8V = OFF, SLEEP Floating=OFF) Brightness Control (0.0V to 2.5VDC). 2.5VDC gives maximum lamp current. Analog Ground. Use for BRITE signal return ONLY. CN1 (Molex 53261-0890) Mates with 51021-0800 housing, 50079-8100 pins SLEEP BRITE BRITE RTN CN1-8 VSYNC Vertical Synchronization Input. 2.5 to 5.0V Logic Level. (20Hz < fSYNC < 200Hz) CN2 for LXM1612-12-01 and -02 (JST SM02(8.0)B-BHS-1-TB or SM02B-BHSS-1-TB) CN2-1 CN2-2 VHI VLO High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to Ground. Connection to low side of lamp. Connect to lamp terminal with longer lead length. DO NOT connect to Ground High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to Ground. Connection to low side of lamp. Connect to lamp terminal with longer lead length. DO NOT connect to Ground CN2 for LXM1612-12-03 (Honda QZ-19-AMYL#02) CN2-3 CN2-1 VHI VLO  
    4.96in. 126mm Honda QZ-19-A3MYL #02 PACKAGE DATA PACKAGE DATA GROUNDED MOUNTING HOLE -01 SM02(8.0)B-BHS-1-TB (JST) -02 SM02B-BHSS-1-TB (JST) -03 CN-1 0.13in. 3.3mm 1 0.63in. 16mm 0.5in. 12.7mm CN-2
1
1
3 GROUNDED MOUNTING HOLE 0.66in. 16.75mm 3.64in. 92.5mm 0.06in. 1.52mm 0.315in . 8.0mm
          
 Weight: 12.5 (g) typ . Copyright © 2000 Rev. 0.3f, 2000-12-06 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 A MICROSEMI
 COMPANY LXM1612-12-xx 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RELIMINARY D ATASHEET  

  
   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 Input Supply Voltage Range (Fully Regulated Lamp Current) Input Supply Voltage Range (Functional) Output Power Brightness Control Input Voltage Range Lamp Operating Voltage Lamp Current (Full Brightness) Operating Ambient Temperature Range Symbol VIN1 PO VBRT_ADJ VLAMP IOLAMP TA Recommended Operating Conditions Min R.C. Max 10.8 9.6 0.0 450 0 12 12 3.5 2.5 535 5.8 13.2 14.4 4.0 5 620 70 Units V W V VRMS mARMS °C W W W . Microsemi . COM   Unless otherwise specified, the following specifications apply over the recommended operating conditions and ambient temperature of 25°C except where otherwise noted. Parameter
OUTPUT PIN CHARACTERISTICS Full Bright Lamp Current Min. Average Lamp Current (Note 2) Lamp Start Voltage Operating Frequency IL(MAX) IL(MIN) VLS fO VBRT_ADJ=2.5VDC, SLEEP =HIGH, Burst Duty=100%, VIN1=12VDC VBRT_ADJ=0VDC, SLEEP =HIGH, Burst Duty=2.0%, VIN1=12VDC 0°C 9.6VDC VBRT_ADJ=2.5VDC, SLEEP =HIGH, VIN1=9.6V – 14.4V VBRT_ADJ=0VDC VBRT_ADJ=2.5VDC IO(LAMP)=100% Duty Cycle IO(LAMP)= Minimum Duty Cycle VIN1=12V VIN1=12V SLEEP =5.0V SLEEP =0V VIN1=12V VIN1=12V 5.2 5.8 0.12 1500 63 -685 -260 2.30 0.0 1.9 -5.0 390 0.0 1.50 -3.0 25 20 VIN1=12VDC, SLEEP =0.0V 0.0 0.5 2.1 1.9 410 0.0 2.5 0.0 27 VIN1 2.0 435 0.0 5.0 1.2 29 200 10 1650 68 -728 -282 2.35 1800 73 -775 -305 2.40 6.4 mARMS mARMS VRMS kHz µADC µADC VDC VDC VDC VDC µADC µADC VDC VDC KΩ Hz µADC Symbol Test Conditions LXM1612-12-xx Min Typ Max Units
BRITE INPUT Input Current Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current IBRT VBRT_ADJ VBRT_ADJ V SLEEP(HI) V SLEEP(LO) I SLEEP
SLEEP INPUT RUN Mode SLEEP Mode Input Current
VSYNC CHARACTERISTICS Logic High Level Input Impedance Input Frequency VSYNCH(HI) VSYNCH(LO) ZIN fSYNC IIN(MIN) ELECTRICALS ELECTRICALS
POWER CHARACTERISTICS Sleep Current 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 5.8mARMS) Copyright © 2000 Rev. 0.3f, 2000-12-06 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 A MICROSEMI
 COMPANY LXM1612-12-xx 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RELIMINARY D ATASHEET         
 Burst Mode Operation W W W . Microsemi . COM  !"#  – 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 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.  !"#  – 2% Burst Duty Cycle  !"# $ – 2% Burst Duty Cycle (Expanded Time Base) Comparator V BRITE + 0.25 2.5V DC Ramp LAMP High Voltage Transformer Transformer Driver VHI D DESCRIPTION R amp Gen V SENSE ISENSE VLO V SYNC  !"# % – RangeMAX Block Diagram Copyright © 2000 Rev. 0.3f, 2000-12-06 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 A MICROSEMI
 COMPANY LXM1612-12-xx 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RELIMINARY D ATASHEET         
 
W W W . Microsemi . COM 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 250Hz. 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. A single input will accommodate negative and positive vertical sync pulses at any pulse width. 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.

   12V
D A C or Pot 10k LXM 1612-12-xx R BR IT E R T N V SYN C V LO CCFL T U BE BR IT E V IN 1 V HI The brightness control may be a voltage output DAC, digital resistor or a simple 10k potentiometer. If desired, an additional series resistor with the 10k potentiometer can be used to set a higher minimum brightness setting 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. If you need to turn the inverter ON/OFF remotely, connect to 2.5V to 5V logic signal to the SLEEP input. 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. 5V 0V V SYN C SLEEP GND
F ig u re 5 - P otentiometer Brightness C ontrol
PW M Signal from System BR IT E
LXM 1612-12-xx P .W . < 2ms 0 < P.W. < 100% of p erio d F ig u re 5 A - P W M Brigh tness C ontrol &'    
( The LXM1612-05 output current can be adjusted by changing the value of two resistors on the PCB. The following table shows the approximate new output current values: Output Current 7.0mA 6.0mA 5.8mA 5.0mA 4.0mA 3.0mA R12 2.00K 1% 2.61K 1% 2.74K 1% 2.74K 1% 2.74K 1% 2.74K 1% R16 Not Used Not Used Not Used 499K 1% 178K 1% 78.7K 1% DESCRIPTION DESCRIPTION R 30 U4 R 33 R 34 R4 C3 C4 R2 C5 R3 C2 C 15 C 12 R 11 C8 R5 R 35 R 36 R 37 R 17 R6 C 17 R 13 C9 R7 C 11 R 12 D2 R 15 R 14 C 16 U3 R 21 C7 R 20 R 40 R 41 D1 C 21 C6 U1 C 14 C 13 R 16 R 31 R 32 R 38 R 39 C 10 R 10    - Component Replacement Locations Page 5 Copyright © 2000 Rev. 0.3f, 2000-12-06 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 A MICROSEMI
 COMPANY LXM1612-12-xx 12V Highly-Integrated, Digital Dimming CCFL Inverter Module P RELIMINARY D ATASHEET  W W W . Microsemi . COM 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. 0.3f, 2000-12-06 Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6