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LXM1620-01
DIRECT DRIVE DUAL LAMP CCFL INVERTER MODULE
T
HE
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NFINITE
P
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N N O VAT I O N
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RELIMINARY
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DESCRIPTION
The Dual Output Module Ideal for Desktop and Industrial Applications. The LXM1620 Direct DriveTM Cold Cathode Fluorescent Lamp (CCFL) Inverter is a single module designed to drive two lamps and is targeted for use with desktop Liquid Crystal Display (LCD) and industrial LCD panels typically ranging in size from 10.4-inches to 17-inches. This two output inverter is the ideal solution to power virtually any two lamp application. Direct Drive Technology. The module design is based on a new patented1 Direct Drive topology, which provides a number of cost and performance advantages. The LXM1620-01 Direct Drive inverters eliminate the classic resonant inductor and capacitors, thus reducing cost and allowing a substantial reduction in module size. Fixed-Frequency Operation. 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. Fail-safe Feature For Multiple Lamp Applications. Our multi-output inverters are designed to keep your application operating at near normal brightness in the event that a lamp fails. This allows the display to remain "on-line" until lamp replacement is convenient. Dual Module Uses Standard Power Supply. The LXM1620 module uses a standard 12V 10% input supply. It also ensures nominal power consumption with 2 lamps requiring only 8 watts. Lamp current is fully regulated with respect to input voltage and output impedance variations. Dimming Features. The LXM1620 modules are equipped with a dimming input that permits brightness control from an external potentiometer or DC voltage. In addition, the sleep input reduces module power to a few microwatts in shut down mode. All LXM1620 modules feature both output open and short-circuit protection. The Most Efficient and Cost-effective Backlight Inverter for Desktop/Industrial Applications. Linfinity's proprietary Direct Drive architecture is the highest efficiency, small form factor solution for all multiple lamp applications. The LXM1620 is fully customizable (electronically and mechanically) to specific customer requirements.
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K E Y F E AT U R E S
s s s s s s s s s s Drive Two Lamps With One Module Small, Compact Size High Efficiency Multiple Outputs Provide Easy LCD Connections Low EMI And Noise Low Power Sleep Mode Output Short And Open Circuit Protection 3:1 Dimming Control Adjustable Lamp Current Up To 6.0mA Per Lamp Long Lamp Life With Soft-Start And Accurate Lamp Current Regulation
A P P L I C AT I O N S
s Desktop LCD Monitors And Panels s Industrial LCD Panels s Hi-Brite Displays
BENEFITS
s Cool Operation s Smooth, Easy-To-Use Brightness Control s Single 12 Volt Supply
US Patent Numbers: 5923129 & 5930121
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
LXM1620 "U N I V E R S A L " MODULE CONNECTION OPTIONS
Dual Connector Configuration Single Connector Configuration
CN2
CCFL Lamp
CN2
LXM1620-01
LXM1620-01
CN1
CN1
CCFL Lamps
CN3
CCFL Lamp
CN3
Desktop Display
Desktop Display
M O D U L E O R D E R I N F O R M AT I O N Part Number Lamp Run Voltage Lamp Current
LXM1620-01
500 - 750VRMS
6mA
Copyright (c) 2000 Rev. 0.9 10/00
LINFINITY
MICROELECTRONICS
INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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PRODUCT DATABOOK 1996/1997
LXM1620-01
DIRECT DRIVE DUAL LAMP CCFL INVERTER MODULE
P
RELIMINARY
D
ATA
S
HEET
(Note 1)
A B S O L U T E M A X I M U M R AT I N G S
Input Supply Voltage (VIN) ............................................................................................................................................................ -0.3V to 18V Output Voltage, no load ..................................................................................................................................... Internally Limited to 1800VRMS Output Current .................................................................................................................................................. 10.0mARMS (Internally Limited) Output Power (per Lamp) ........................................................................................................................................................................ 6.0W Input Signal Voltage, (SLEEP and BRITE Inputs) .......................................................................................................................... -0.3V to VIN Ambient Operating Temperature .................................................................................................................................................... 0C to 70C 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 the specified terminal.
R E C O M M E N D E D O P E R A T I N G C O N D I T I O N S (R.C.) Thismodulehasbeendesignedtooperateoverawiderangeofinputandoutputconditions. However,bestefficiencyandperformancewillbeobtainedifthemoduleisoperated undertheconditionlistedinthe'R.C.'column. Min.andMax.columnsindicatevaluesbeyondwhichtheinverter,althoughoperational,willnotfunctionoptimally. Parameter
Input Supply Voltage Range (Functional) Input Supply Voltage (Fully Regulated Lamp Current) Output Power (per Lamp) LXM1620-01
Symbol
VIN PO
Recommended Operating Conditions Min. R.C. Max.
10.2 10.2 12 12 4 16 13.8 5
Units
V V W
Brightness Control Input Voltage Range Lamp Operating Voltage Lamp Current (Full Brightness - per Lamp) Operating Ambient Temperature Range
LXM1620-01
VBRT ADJ VLAMP IOLAMP TA
0.0 500
625 6.0
5.0 750
V VRMS mARMS C
0
70
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25C ambient temperature for the LXM1620.
Parameter Output Pin Characteristics
Full Bright Lamp Current
(per Lamp)
Symbol
Test Conditions
LXM1620-xx Min. Typ. Max.
5.4 6.0 0.5 1500 52 -6 1800 62 -10 6.6
Units
1620-01
I L (MAX) IL (MIN) VLS fO IBRT VC VC VSLEEP (HI) VSLEEP (LO) ISLEEP IIN (MIN)
VBRT ADJ = 5.0VDC, SLEEP = HIGH, VIN = 12VDC VBRT ADJ = 0VDC, SLEEP = HIGH, VIN = 12VDC 0C < TA < 40C, VIN 10.8VDC VBRT ADJ = 5.0VDC, SLEEP = HIGH, VIN = 12VDC VBRT ADJ = 0VDC IO (LAMP) = 100% IO (LAMP) = Minimum
mA RMS mARMS VRMS KHz ADC VDC VDC VDC VDC ADC ADC
Minimum Lamp Current (per Lamp) (Note 2) Lamp Start Voltage Operating Frequency
57 -8 5.0 0
BRITE Input
Input Current Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current
SLEEP Input
RUN Mode SLEEP Mode Input Current 2.2 -0.3 60 0 VIN 0.8 180 50
SLEEP = 5.0V VIN = 12VDC , SLEEP = 0VDC
120 1
Power Characteristics
Sleep Current Note 2. Minimum lamp current required to maintain even light output may vary with display panel.
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Copyright (c) 2000 Rev. 0.9 10/00
PRODUCT DATABOOK 1996/1997
LXM1620-01
DIRECT DRIVE DUAL LAMP CCFL INVERTER MODULE
P
RELIMINARY
D
ATA
S
HEET
FUNCTIONAL PIN DESCRIPTION
Conn. CN1
CN1-1, 2 CN1-3, 4 CN1-5 CN1-6 CN1-7, 8
Pin
VIN GND SLEEP BRITE N.C.
Description
Input Power Supply. (10.2V VIN 16V) Power Supply Return. ON/OFF Control. (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF) Brightness Control (-0.3V to 5.0VDC). 5.0VDC gives maximum lamp current. Leave unconnected.
CN2 and CN3: Refer to Figure 1
PHYSICAL DIMENSIONS
LXM1620-01
All dimensions are in inches (mm)
5.51 (140)
CN3
2.47 (62.75) 0.060 (1.52) max.
O 0.12 (3.0) Grounded Mounting Hole 0.370 (9.4) max. 0.449 (11.4) max.
Warning!! High Voltage Present At All Output Connectors
0.307 (7.8)
Copyright (c) 2000 Rev. 0.9 10/00
CN2
0.053 (13.45)
CN1
0.94 (24)
3
PRODUCT DATABOOK 1996/1997
LXM1620-01
DIRECT DRIVE DUAL LAMP CCFL INVERTER MODULE
P
RELIMINARY
D
ATA
S
HEET
C O N N E C T O R S C H E M AT I C
8 1 2 3
CN1
1 3 2 1
CN3
VHI1
VHI2
CN2
Inverter Output 1
Inverter Output 2
FIGURE 1 -- LXM1620-01 Connector Schematic
Connectors: CN1 = MOLEX 53261-0890 CN2, CN3 = JST SM03(4.0)B-BHS-1-TB
Connection Rules
Mates With: Pins: 50079-8100*, Housing: 51021-0800
* Loose (-8000, Chain) Recommended #26 AWG wiring
JST BHR-03VS-1
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 LXM1620-01 module connectors are wired per industry standard. The lamphot wires (high voltage wires) are always on pin 1 or 2, and thecold wire (low voltage wire) is always on pin 3. F A I L S A F E F E AT U R E F O R M U L T I P L E L A M P O P E R AT I O N S Our multi-output inverters are designed to keep your application operating at near normal brightness in the event that a lamp fails. This allows the display to remain "on-line" until lamp replacement is convenient. Linfinity "pairs" the lamps so that if one lamp in the pair breaks, most of its current is added to the good lamp. CCFLs will respond with more brightness for a period of time. Operating time in this mode will be a function of the lamps age but should be typically in the order of hundreds of hours. This operating characteristic can provide adequate display performance for a limited, but useful period of time. Shortening of the lamp life in this mode is typically not a concern as it is recommended thatall lamps in a display be replaced at the same time.
Lamps
IS
FIGURE 2 -- Dual Output Stage
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Copyright (c) 2000 Rev. 0.9 10/00
PRODUCT DATABOOK 1996/1997
LXM1620-01
DIRECT DRIVE DUAL LAMP CCFL INVERTER MODULE
P
RELIMINARY
D
ATA
S
HEET
DIRECT DRIVE OUTPUT ARCHITECTURE Direct Drive architecture includes two load feedback control loops to provide uncompromised CCFL ignition and operation characteristics. Lamp current is regulated in the CCFL return lead (ISNS loop) to insure constant light output with changing lamp parameters and power supply voltage. This also allows accurate and repeatable brightness control. Dimming ratio with the LX1620 analog dimming inverters is typically 6:1 when driving dual LCD lamp panels. If no current flows in the CCFL return path because of an unstruck or failed lamp, the inverter applies full strike voltage potential. The output voltage feedback loop (VSNS) takes control and regulates output voltage to 1650VRMS. This insures the lamp will ignite under worst case temperature and aging conditions. Because output voltage is actively regulated, it will never exceed component and panel insulation ratings. This prevents destructive corona discharge to insure long term reliability of the system.
High Voltage Transformer SLEEP Transformer Driver
VHI1
GND
VSENSE ISENSE VLO
FIGURE 3 -- LXM1620 Block Diagram (Only one lamp shown)
T Y P I C A L A P P L I C AT I O N S
5.0VDC
10.8VDC- 16VDC
10k
BRITE
VIN
VHI2 VHI1
Lamp 1 Lamp 2
LXM1620-xx
0V 5V SLEEP GND VLO
FIGURE 4 -- Potentiometer Brightness Control
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may not 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. 0.9 10/00
LAMP 1
BRITE
Controller
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