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A
MICROSEMI
COMPANY
RangeMAXTM
LXM1614-14-11
DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE
PRELIMINARY DATASHEET
Dual Drive, RangeMAX Wide Range Dimming, Single Output Inverter. The

Independent Brightness
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LXM1614 series of Direct DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules is specifically designed for driving LCD backlight lamps. Although similar to the RangeMAX LXM1612 wide range dimming inverters, the LXM1614 family offers two separate brightness controls for lamp current amplitude and duty cycle. This innovation of dual brightness control with extended dimming, combined with Linfinity's high efficiency Direct Drive topology, provides the industry's most feature rich, small form factor inverter available. The wide range dimming provides exceptional display readability at less than 1% of full brightness, allowing both power savings and low ambient light operating capability.
The inverters provide brightness adjustments utilizing standard lamp current amplitude control as well as supporting Linfinity's RangeMAX wide range dimming technique. Combining both brightness controls into a single inverter supports the "self heating" lamp technology by using a "boost" current feature and still offers duty cycle control for low brightness operation. This controlled overdrive capability eliminates the need for traditional resistive heater wire methods to ensure light output at extremely low temperatures. The LXM1614 brightness controls support temperature monitoring with look-up table applications by accepting either a PWM input or DC voltage. Large panel lamps with greater thermal inertia can also utilize this "instant-bright" feature and minimize warm up time.
Dual Drive Dimming Control.
(continued next page)

Controls For Lamp Current Amplitude and Duty Cycle RangeMAX 1-100% Wide Range Dimming with Controlled Overdrive Boost On-Board Thermister automatically limits maximum lamp current Supports Wide Input Voltage Range 9-16V High Efficiency, Single Stage Direct Drive Topology -40C to +85C Ambient Temperature Operation Output Open/Short Circuit Protection Up to 1800V Output Voltage Capability Single side PCB Component Layout
Self Heating And High
Pressure Lamp Technology
Automotive Navigation, GPS
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com

Systems, Auto PC
Extended Cold Temperature
Operation
Aircraft Cabin Displays Low Ambient Light Conditions
Requiring Wide Range Dimming "Instant On" To Full Brightness For Large LCD Backlight Panels Industrial Notebook And Workstations
Controlled overdrive mode of LXM1614 Inverter accelerates lamp warm-up time to provide maximum light output even in extreme temperature environments
LXM1614-14-11 LXM1614-14-11

PART NUMBER
LXM1614-14-11
Copyright (c) 2000 Rev. 0.3b,2000-11-20
OUTPUT CONNECTOR
JST SM02(8.0)B-BHS-1-TB
INVERTER MATES DIRECTLY TO PANEL CONNECTORS
BHR-03VS-1
Page 1
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
A
MICROSEMI
COMPANY
RangeMAXTM
LXM1614-14-11
DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE
PRELIMINARY DATASHEET

Direct Drive Technology. An on-board thermister monitors the inverter's relative The module design is based on the Direct Drive topology, temperature and limits the maximum allowable lamp current. This current limit automatically protects the lamp which provides a number of cost, performance, and form and inverter as a function of temperature which helps factor advantages. The LXM1614 series inverters eliminate the classic resonant inductor/capacitors and integrate the control the system during Boost mode. wide range dimming logic into the controller. RangeMAX Digital Dimming Technique.
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Digital dimming provides flicker-free brightness control in any wide range dimming application. Dimming ratios greater than 100:1 can be achieved. A video synchronization feature allows wide ratio dimming without the display disturbances and interference seen with competitive products. The resultant "burst drive" that energized the lamp was designed specifically to ensure that no premature lamp degradation occurs. Even in overdrive boost mode, the waveform is carefully controlled to minimize the effects that are detrimental to lamp life. Individual panel specifications should be referenced for specific thermal and electrical parameters.
Additional Features.
Other benefits of this new topology are fixed-frequency operation and secondary-side strike-voltage regulation. Strike-voltage regulation minimizes corona discharge in the output transformer and related circuitry, providing longer life and higher reliability. All LXM1614 modules feature both open and shorted lamp protection. The dual drive LXM1614 is fully customizable (electronically and mechanically) to specific customer requirements.

Input Supply Voltage (VIN) ...................................................................................................................................-0.3V to 17V Output Voltage, no load...........................................................................................................Internally Limited to 1800VRMS Output Current................................................................................................................... 16mARMS (<2 minutes@TA<25C) Output Power................................................................................................................................................................... 10W Input Signal Voltage (BRITE, BOOST) ................................................................................................................. -0.3V to VIN Input Signal Voltage (SLEEP, VSYNC).................................................................................................................... -0.3V to VIN Ambient Operating Temperature, zero airflow .................................................................................................. -40C to 85C Storage Temperature Range ............................................................................................................................ -40C to 85C
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.

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
VIN Voltage Range Output Power Brightness Control Input Voltage Range BOOST Control Input Voltage Range Lamp Operating Voltage Lamp Current Full Brightness Operating Ambient Temperature Range
Symbol
VIN PO VBRT_ADJ VBST_ADJ VLAMP IOLAMP TA
Recommended Operating Conditions Min R.C. Max
9.0 0.0 0.0 4.0 -40 16.0 6.0 5.0 5.0 900 9.0 85
Units
V W V V VRMS mARMS C
LXM1614-14-11 LXM1614-14-11
Copyright (c) 2000 Rev. 0.3b,2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
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MICROSEMI
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Parameter Symbol
IL(BOOST) IL(BOOST) IL(MIN) VLS FO TFAULT
RangeMAXTM
LXM1614-14-11
DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE
PRELIMINARY DATASHEET

Unless otherwise specified, these specifications apply over the recommended operating conditions and TA = -40 to 85C ambient temperature for the LMX1614-14-11.
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Test Conditions
LXM1614-14-11 Min Typ Max
Units
OUTPUT PIN CHARACTERISTICS Lamp Current, Full Boost Lamp Current, No Boost Min. Average Lamp Current (Note 2) Lamp Start Voltage Operating Frequency Fault Timeout VIN=9V, VBRT_ADJ = 5V, VBST_ADJ = 5V, TA per Figure 2 VIN=9V, VBRT_ADJ = 5V, VBST_ADJ = 0V, TA per Figure 2 VBRT_ADJ = 0V 9.0 4.0 .12 1800 VBRT_ADJ = 5V 75 1.0 mARMS mARMS mARMS VRMS KHz SEC
BRITE INPUT Linear Dim Control Range Input Current Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current VBRT IBRT VBRT_ADJ VBRT_ADJ VBRT_ADJ = 0V VBRT_ADJ = 5V IO(LAMP) = 100% Duty Cycle IO(LAMP) = Minimum Duty Cycle 4.5 0 0.5 10 10 5.0 0.5 4.5 VDC ADC ADC VDC VDC
BOOST INPUT Linear Dim Control Range Input Current Input Voltage for Max. Boost Current Input Voltage for Min. Boost Current VBST IBOOST VBST_ADJ VBST_ADJ VBST_ADJ = 0V VBST_ADJ = 5V 4.5 0 0.5 10 10 5.0 0.5 4.5 VDC ADC ADC VDC VDC
SLEEP INPUT RUN Mode OFF Mode Input Current VSLEEP VSLEEP IISLEEP SLEEP=5V SLEEP=0V 2.4 0 390 410 0 VIN 0.8 435 VDC VDC uA
VSYNC CHARACTERISTICS Logic High Level Logic Low Level Input Impedance Input Frequency Output Burst Rate VSYNC (HI) VSYNC (LO) ZIN FVSYNC FBURST VSYNC=0V, Free Run Frequency 50 167 2.4 -0.3 10 300 5.5 0.8 VDC VDC K Hz Hz
ELECTRICALS ELECTRICALS
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)
Copyright (c) 2000 Rev. 0.3b,2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
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MICROSEMI
COMPANY
Pin
RangeMAXTM
LXM1614-14-11
DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE
PRELIMINARY DATASHEET

Conn. Description CN1 (Molex 53261-0890)* CN1-1,2 VIN Main Input Power Supply (9V to 16V) CN1-3,4 GND Power Supply Return CN1-5 SLEEP > 2.4V (Backlight on), < 0.8V (Backlight off), IISLEEP=400A @ 5.0V CN1-6 BOOST Lamp Current Amplitude Control (0.5-4.5VDC) 4.5VDC gives maximum boost CN1-7 BRITE Brightness Control (0.5- 4.5VDC) 4.5VDC gives maximum lamp current CN1-8 VSYNC Vertical Synchronization Input (50 < fSYNC < 300Hz), minimum pulse width 10S CN2 (JST SM02(8.0)B-BHS-1-TB) CN2-1 CN2-2 VOUT1 VOUT2 High Voltage CCFL Lamp Supply High Voltage CCFL Lamp Return
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* LX9501 Mating Connector Assembly Available

4.724in.
120m m
0.394in.
10m m
C N -1
0.905in.
23m m
0.787in.
20m m
C N -2
0.118in.
3m m
5.118in.
130m m
0.394in.
10m m
0.280in.
7.1m m
W eight: 12.5(g) typ.
0.0393in.
1m m
MECHANICALS MECHANICALS
Copyright (c) 2000 Rev. 0.3b,2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
A
MICROSEMI
COMPANY
RangeMAXTM
LXM1614-14-11
DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE
PRELIMINARY DATASHEET

H igh Voltage T ransformer V BST
.5 4.5V DC
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VOUT1
G ain & Summing
T ransformer D river
C omparator V BR T R amp
.5 4.5V DC
V SEN SE I SEN SE
+ T emperature Sense I/V VOUT2
V SYN C
R amp G en. & PLL
- RangeMAX Simplified Block Diagram
HIGHLIGHTS
*
Integrated dual 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 170Hz. 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.
LAMP
DESCRIPTION DESCRIPTION
Copyright (c) 2000 Rev. 0.3b,2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
A
MICROSEMI
COMPANY
RangeMAXTM
LXM1614-14-11
DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE
PRELIMINARY DATASHEET

LAMP VOLTAGE & LAMP CURRENT - BURST MODE OPERATION
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- LXM1614 Combines Current Amplitude and Digital Techniques
The LXM1614 provides both lamp current amplitude control (BOOST) and a brightness control (BRITE) for dimming. Please see following sections for dimming and amplitude boost control. To achieve extremely wide dimming ranges, rather than only using the traditional dimming technique of varying lamp current magnitude to adjust light output, RangeMAX inverters utilize 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 3% duty cycle, allowing the lamp to be dimmed to less than 2% of its full brightness As can be seen in Trace 4 of Figure 5, 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.

- 50% Burst Duty Cycle
- 2% Burst Duty Cycle
DESCRIPTION DESCRIPTION
- 2% Burst Duty Cycle (Expanded Time Base)
Copyright (c) 2000 Rev. 0.3b,2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
A
MICROSEMI
COMPANY
RangeMAXTM
LXM1614-14-11
DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE
PRELIMINARY DATASHEET

DUAL DIMMING CAPABILITY
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As seen in the Brightness vs. Time graphs, the boost mode operation can improve the performance of cold cathode florescent lamps in any LCD application by reducing the time it takes to warm up lamps to their optimum operating temperature. This feature is helpful in large LCD multi-lamp monitors as well as automotive or industrial extreme temperature applications.
The "boost" control is used to provide a timed overdrive mode to maximize light output over temperature. After a panel is characterized with a profile of the user's application (such as desired light output as a function of ambient light and temperature), the appropriate boost level and duration of the boost can be set. Further wide range dimming control is provided by the Brite input dimming function.
6 -
DESCRIPTION DESCRIPTION
-
Copyright (c) 2000 Rev. 0.3b,2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
A
MICROSEMI
COMPANY
RangeMAXTM
LXM1614-14-11
DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE
PRELIMINARY DATASHEET

WIDE RANGE DIMMING FUNCTION AMPLITUDE BOOST FUNCTION
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Dimming can be controlled by a DC voltage (like a voltage output DAC) or by a PWM signal (5V logic level PWM signal from a micro controller). The PWM signal should be 400Hz to 4kHz, 0V to 5V, 0% to 100% duty cycle.
The Boost Function Control signal levels are the same as the Dimming Control. Less than 0.5V provides 4mA maximum lamp current while 4.5V on Boost provides "max boost" with a max lamp current of 9mA. Please note that these maximum lamp current levels are protected by the onboard thermister which limits the maximum lamp current automatically as a function of temperature as seen in Figure 9.
Lamp Current (mArms) control range boost mode
Brightness
control range
100%
9
VIN = 9V
4
no boost mode
Typical curve for 5.8" panel. Other panels may be different.
1% BRITE 0.0 V 0.5 V 4.5 V 5.0 V
IBOOST 0.0 0.5 4.5 5.0
- Brightness as a function of the BRITE control (CN1-7)
- Maximum lamp current as a function of the Boost control
(CN1-6)
Lamp Current (mArms)
9.0 7.5 5.5 4.0
Typical curve for 5.8" panel. Other panels may be different.
VIN = 9V
DESCRIPTION DESCRIPTION
Temp -40 0
temperature
25
85C
- Maximum lamp current as a function of ambient
Copyright (c) 2000 Rev. 0.3b,2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
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MICROSEMI
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9V -16V BOOST B R IT E LX M 1614-14-1 1 V IN V OUT1 CCFL T U BE VOUT2
RangeMAXTM
LXM1614-14-11
DUAL DIMMING, EXTENDED TEMPEERATURE CCFL INVERTER MODULE
PRELIMINARY DATASHEET

*
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S LEE P 0V 2.5V V SYN C
S YN C
G ND
F ig ure 1 1 - B rightness C ontro l
The BRITE/BOOST control may be a voltage output DAC, or other voltage source as shown in Figure 11. A 5V Logic Level PWM signal from a micro-controller may also be used as shown in Figure 12. * 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 a 2.4V 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 2.4V and 5V. * Connect VOUT1 to the high voltage supply wire from the lamp. Connect VOUT2 to the high voltage return wire from the lamp.
P W M S ig nal from System
BOOST BR ITE

Also available in other wide range dimming single lamp inverters LXM1612-xx-xx, LXM1615, Dual Output LXM1621-01, LXM1622-xx-xx and Quad Output LXM1641-01 versions for multiple lamp applications.
P.W .
LXM 1614-14-11
2.5m S to 250 S
0 < P.W. < 100% of period
F ig u re 1 2 - P W M B righ tn ess C on tro l
APPLICATION APPLICATION
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 (c) 2000 Rev. 0.3b,2000-11-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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