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LITEMAX LF1548
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Sunlight Readable 15" LCD Display
(1st Edition 7/26/2004 )
All information is subject to change without notice.
LITEMAX Electronics Inc.
4F, No.131-3, Lane235, Bau-chiau Rd.,
Shin-dian City, Taipei County, Taiwan R.O.C.
Tel : 886-2-8919-1858
Fax: 886-2-8919-1300
Homepage: http://www.litemax.com.tw
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i Contents
1.0 Handling Precautions
2.0 General Description
2.1 Display Characteristics
2.2 Functional Block Diagram
3.0 Absolute Maximum Ratings
4.0 Optical Characteristics
4.1 Signal for Lamp connector
4.2 Parameter guideline for CCFL Inverter
5.0 Signal Interface
5.1 Module Interface Connectors
5.2 Module Connector Pin Configuration
5.3 Backlight Connectors
5.4 Backlight Connector Pin Configuration
5.5 Signal Electrical Characteristics
5.6 Interface Timings Characteristics
5.7 Interface Timing Definition
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6.0 Pixel format image
7.0 Power Consumption
8.0 Power ON/OFF Sequence
9.0 Backlight Characteristics
9.1 Signal for Lamp connector
9.2 Parameter guideline for CCFL Inverter
10.0Vibration, Shock, and Drop
10.1 Vibration & Shock
10.1.1 Vibration Test Spec
10.1.2 Shock Test Spec
10.2 Drop
11.0 Environment
11.1 Temperature and Humidity
11.1.1 Operating Conditions
11.1.2 Shipping Conditions
11.2 Atmospheric Pressure
11.3 Thermal Shock
12.0 Reliability
12.1 Failure criteria
12.2 Failure rate
12.2.1 Usage
12.2.2 Components de-rating
12.3 CCFL life
12.4 ON/OFF cycle
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13.0 Safety
13.1 Sharp edge requirement
13.2 Material
13.2.1 Toxicity
13.2.2 Flammability
13.3 Capacitors
13.4 Hazardous voltage
14.0 Other requirements
14.1 Smoke free design
15.0 Mechanical Characteristics
16.0 LI2203 Inverter
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ii Record of Revision
Version and Date Page Old description New Description Remark
0.1 2004/3/25
Version and Date
All First Edition for Customer All
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1.0 Handling Precautions
1) Since front polarizer is easily damaged, pay attention not to scratch it.
2) Be sure to turn off power supply when inserting or disconnecting from input connector.
3) Wipe off water drop immediately. Long contact with water may cause discoloration or spots.
4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth.
5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard surface.
6) Since CMOS LSI is used in this module, take care of static electricity and insure human earth when
handling.
7) Do not open nor modify the Module Assembly.
8) Do not press the reflector sheet at the back of the module to any directions.
9) In case if a Module has to be put back into the packing container slot after once it was taken out from the
container, do not press the center of the CCFL Reflector edge. Instead, press at the far ends of the CFL
Reflector edge softly. Otherwise the TFT Module may be damaged.
10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate nor tilt the Interface
Connector of the TFT Module.
11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist nor
bend the TFT Module even momentary. At designing the enclosure, it should be taken into consideration
that no bending/twisting forces are applied to the TFT Module from outside. Otherwise the TFT Module
may be damaged.
12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please follow local ordinances or
regulations for disposal.
13) Small amount of materials having no flammability grade is used in the LCD module. The LCD module should be
supplied by power complied with requirements of Limited Power Source (2.11, IEC60950 or UL1950), or be applied
exemption.
14) The LCD module is designed so that the CFL in it is supplied by Limited Current Circuit (2.4, IEC60950 or UL1950).
Do not connect the CFL in Hazardous Voltage Circuit.
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2.0 General Description
This specification applies to the 15.0 inch Color TFT-LCD Module LF1548.
The display supports the XGA (1024(H) x 768(V)) screen format and 262,144 colors (RGB 6-bits data).
All input signals are 1 Channel LVDS interface compatible.
This module does not contain an inverter card for backlight.
Features
-XGA 1024(H) x 768(V) resolution
-12 CCFLs (Cold cathode Fluorescent Lamp)
-High contrast ratio, high aperture ratio
-Wide viewing angle
-High-speed response
-Low power consumption
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Application
Desktop monitors
2.1 Display Characteristics
The following items are characteristics summary on the table under 25 condition:
ITEMS Unit SPECIFICATIONS
Screen diagonal [mm] 381 (15”)
Outline dimension [mm] 326.5 x 253.5 x 19.46 typ.
Display Area [mm] 304.128 (H) x 228.096(38.1cm diagonal)
Resolution 1024(R,G,B x 3) x 768
Pixel Pitch [mm] 0.297 x 0.297
Pixel Arrangement R.G.B. Vertical Stripe
Display Mode TN mode, Normally White
Typical white Luminance. [cd/m2]
Brightness uniformity 80% typ. (note 2)
Luminance uniformity 1.7 max.(Note 3)
Crosstalk (at 60Hz) 1.2% max. (note 4)
Contrast Ratio 400 : 1 typ.
Support Colors 262,144 colors (6-bit for R,G,B)
Chromaticity(CIE1931)
White-x
White-y 0.329
Color Gamut 60% typ., of NTSC coverage
Viewing angle 70(left),70(right),50(up),70(down) CR=10
Response Time [msec] 16ms typ. (Tr +Tf)
Nominal Input Voltage VDD [Volt] +3.3 V
Power Consumption
(VDD line + CCFL line)
Electrical Interface LVDS (1 ch)
Frame rate [Hz] 60Hz typ., 75Hz max.
Weight [Grams] 1700 typ.
MTBF [hour] 50000 hours (note 6)
Mounting method Side mounting
Surface treatment Anti-glare, hard coating (3H)
Temperature Range
Operating
Storage (Shipping)
[Watt] 56 (Max) @5mA (with Inverter)
o
[
C]
o
[
C]
1600nit (typ) @8mA
0.313
0 to +50
-20 to +60
(note 1)(with Litemax VGA) note 5
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256 512
2
1
4
Note 1: Brightness is measured at the center point of brightness value with all pixels displaying white.
90 %
50 %
768
3
192
384
5
576
Unit: pixels
10 %
10 %
50 %
90 %
Unit: percentage of dimension of display area
Note 2: Brightness uniformity of these 9 points is defined as below:
(Min. brightness / Max. brightness) x 100%
Note 3: TCO ’99 Certification Requirements and test methods for environmental labeling of Display Report No. 2
defines Luminance uniformity as below:
((Lmax,+30deg. / Lmin,+30deg.) + (Lmax,-30deg. / Lmin,-30deg.)) / 2
TCO 99 certification requirements and test methods
1) Diagrammatic
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A
A
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m
d
Note 4:
L
Effective areaW×H
max+30
2) D is the diagonal of the screen in centimeters. And m
m
(cm)=D×1.5 with a minimum distancemd=50 cm
d
and L
is as follow.
d
min+30
3) The measurement positions shall consist of an active white square of size 4 by 4 cm.
4) Measure L
max+30
degrees and measure L
and L
that are given as points L & R. And then rotated to an azimuth angle of –30
min+30
max-30
and L
again using the same procedure.
min-30
5) The variation in luminance ratio is calculated as the ratio:
L
=(( L
R
max+30
/ L
min+30
1/2
)(L
max-30
1/6
/ L
min-30
1/6
))/2 1.7
1/2
2/3 1/3
’
1/2
B
184 gray level 184 gray level
B’
1/6
1/6
1/3
1/2
2/3
Unit: percentage of dimension of display area
l / LAx 100%= 1.2% max., LA and LB are brightness at location A and B
l L
A-LA’
l / LBx 100%= 1.2% max., LA’ and LB’ are brightness at location A’ and B’
l L
B-LB’
0 gray level
Note 5: None Litemax VGA Luminance 1692 nits (typ.)
Note 6: CCFL Life time is determined as the time at which brightness.
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2.2 Functional Block Diagram
The following diagram shows the functional block of 15.0 inches Color TFT-LCD Module:
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LVDS
+ 3.3 V
AU ASIC
Connector
LVDS
DC/DC
Timing
RSDS
Gamma
DC POWER
G1
TFT-LCD
1024*(3)*768
Pixels
G768
D1 D3072
12 CCFL
Inverter
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g
ge
3.0 Absolute Maximum Ratings
Absolute maximum ratings of the module is as following:
Item Symbol Min Max Unit Conditions
Logic/LCD Drive Voltage VDD -0.3 +3.6 [Volt]
Input Voltage of Signal Vin -0.3 VDD+0.3 [Volt]
CCFL Current ICFL 3.0 9.0 [mA] rms
Operating Temperature TOP 0 +50 [oC] Note 2
Operating Humidity HOP 20 85 [%RH] Note 2
Storage Temperature TST -20 +60 [oC] Note 2
Storage Humidity HST 5 95 [%RH] Note 2
Vibration 1.5 / 10-200 [G / Hz]
Shock 50/20 [G / ms] Half sine wave
Assured Torque at Side Mount 2.0 [kgf.cm]
Re-screw 3 [Times]
Note 1: To exceed 8.0mA, life time accelerate drop down and if to exceed 9.0mA has safety problem
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Note 1
Note 2 : Maximum Wet-Bulb should be 39
Wet bulb temperature chart
Relative Humidity %
100
95
90
80
70
60
50
Stora
40
e ran
Operation range
30
and No condensation.
Twb=39
T=40,H=95%
T=50,H=55%
T=60,H=39%
T=65,H=29%
20
Storage range
10
5
0
-20 0 6050
TemperatureoC
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4.0 Optical Characteristics
The optical characteristics are measured under stable conditions at 25 (Room Temperature):
Item Unit Conditions Min. Typ. Max.
Viewing Angle
CR: Contrast Ratio
Contrast ratio
Response Time( Note 1) [msec]
Color / Chromaticity Red x
Coordinates (CIE) Red y
Color Coordinates (CIE) W hite
Brightness Uniformity [%]
White Luminance at CCFL 7mA
White Luminance at CCFL 5mA
Crosstalk ( in 60Hz)
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Horizontal (Right)
[degree]
[degree]
[degree]
[degree]
[msec]
[msec] Raising + Falling
[cd/m2]
[%]
CR = 10 (Left)
Horizontal (Right)
CR =5 (Left)
Vertical (Upper)
CR = 10 (Lower)
Vertical (Upper)
CR = 5 (Lower)
Normal Direction 300 400 -
Raising Time Ton
( 10%-90% )
Falling Time Toff
( 90%-10% )
Green x
Green y
Blue x
Blue y
White x
White y
-
-
-
-
-
-
-
-
-46
-1217
-1623
0.587 0.617 0.647
0.317 0.347 0.377
0.260 0.290 0.320
0.563 0.593 0.623
0.118 0.148 0.178
0.070 0.100 0.130
0.283 0.313 0.343
0.299 0.329 0.359
75 80 -
-
-
70
70
80
80
50
70
75
80
1600
1300
-
-
1.2
Note 1: Definition of Response time:
The output signals of photodetector are measured when the input signals are changed from “ Black” to “ White”
(falling time), and from “White” to “ Black” (rising time), respectively. The response time interval between the 10% and
90% of amplitudes. Refer to figure as below.
TrR
%
TrD
100
90
Optical
Response
10
white
0
white
black
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A
)
5.0 Signal Interface
5.1 Module Interface Connectors
Physical interface is described as for the connector on module.
These connectors are capable of accommodating the following signals and will be following components
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Connector Name
Manufacturer
Type / Part Number
5.2 Module Connector Pin Configuration
DF-14H-20P-1.25H (Hirose) or CWY20G-A0D1T (PTW O)
Pin No. Symbol Description
1 VDD Power Supply, 3.3V (typical)
2 VDD Power Supply, 3.3V (typical)
3 VSS Ground
4 VSS Ground
5 Rin0- - LVDS differential data input (R0-R5, G0)
6 Rin0+ + LVDS differential data input (R0-R5, G0)
7 VSS Ground
8 Rin1- - LVDS differential data input (G1-G5, B0-B1)
9 Rin1+ + LVDS differential data input (G1-G5, B0-B1)
10 VSS Ground
11 Rin2- - LVDS differential data input (B2-B5, HS, VS, DE)
12 Rin2+ + LVDS differential data input (B2-B5, HS, VS, DE)
13 VSS Ground
14 ClkIN- - LVDS differential clock input
15 ClkIN+ + LVDS differential clock input
16 VSS Ground
17 Rin3- NC
18 Rin3+ NC
19 VSS Ground
20 NC Reserved
Interface Connector
Hirose, PTWO or compatible
DF-14H-20P-1.25H (Hirose)
CWY20G-
0D1T (PTWO
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5.3 Backlight Connectors
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Connector Name / Designation
Manufacturer
Type / Part Number
Mating Type / Part Number
For Lamp Connector
JST or compatible
BHR-04VS-1
SM04(4.0)B-BHS-1-TB
5.4 Backlight Connector Pin Configuration
CN2, CN4 CN3, CN5
Pin # Signal name Pin # Signal name
1 Lamp High Voltage 1 Lamp High Voltage
2 Lamp High Voltage 2 Lamp High Voltage
3 No connection 3 Lamp High Voltage
4 Ground 4 Lamp High Voltage
Cable length: 200 +- 10 mm
Connector-output position: right side (front view)
Lamp assy design shall be easy for replacement and repair.
5.5 Signal Electrical Characteristics
Each signal characteristics are as follows;
Item Symbol Min Typ Max Unit
LCD Drive
voltage
“High” input signal
voltage
“Low” input signal
voltage
VDD +3.0 +3.3 +3.6 [V]
Vih 2.0 - - [V]
Vil - - 0.8 [V]
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6bits input data format
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Clkln
Vdiff=0V
R0IN0
G0 R5 R4 R3 R2 R1 R0
R1IN1
B1 B0 G5 G4 G3 G2 G1
R2IN2
Note: R/G/B data 7:MSB, R/G/B data 0:LSB
DE VS HS B5 B4 B3 B2
Previous Data for current Clk cycle Next
Scaling IC
6bits+FRC
0
1
2
3
8 bits LVDS
Transmitter
0
1
2
3
4
Controller IC
8 bits LVDS
Receiver
8 bits RSDS
Transmitter
Driver IC
6 bits RSDS
Receiver driver
IC
0
1
2
3
4
LVDS interfaceSystem
01
23
4
LF1548 Modul
Open
01
23
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5.6 Signal Electrical Characteristics
Input signals shall be low or Hi-Z state when Vin is off
It is recommended to refer the specifications of SN75LVDS82DGG (Texas Instruments) in detail.
Each signal characteristics are as follows;
Parameter Condition Min Max Unit
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Vth
Vtl
Differential InputHigh
Voltage(Vcm=+1.2V)
Differential Input Low
Voltage(Vcm=+1.2V)
100
-100
[mV]
[mV]
5.7 Interface Timings
Basically, interface timings described here is not actual input timing of LCD module but output timing of
SN75LVDS82DGG (Texas Instruments) or equivalent.
5.7.1 Timing Characteristics
Signal Item Symbol MIN TYP MAX Unit
DTCLK Freq. Fdck 65 81 MHz
DTCLK Cycle Tck 12.3 15.4 ns
+V-Sync Frame Rate 1/Tv 60 75 Hz
+V-Sync Cycle Tv 13.33 16.7 ms
+V-Sync Cycle Tv 806 lines
+V-Sync Active level Tva 6 lines
+V-Sync V-back porch Tvb 29 lines
+V-Sync V-front porch Tvf 3 lines
+DSPTMG V-Line M 768 lines
+H-Sync Scan rate 1/Th 60 KHz
+H-Sync Cycle Th 1344 Tck
+H-Sync Active level Tha(*1) 136 Tck
+H-Sync Back porch Thb(*1) 160 Tck
+H-Sync Front porch Thf 24 Tck
+DSPTMG Display Pixels N 1024 Tck
Note:
Typical value refer to VESA STANDARD
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5.8 Interface Timing Definition
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6.0 Pixel format image
Following figure shows the relationship of the input signals and LCD pixel format.
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Odd : RO0~RO5,GO0~GO5,BO0~BO5
1st Line
768th Line
Odd Even
1 2 1023 1024
B
G G
R R
B
G
R R
Even: RE0~RE5,GE0~GE5,BE0~BE5
B
B
G G G
B
G G
R
B
R R
R B
B
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7.0 Power Consumption
Input power specifications are as follows;
Symbol Parameter Min Typ Max Units Condition
VDD LCD Drive Voltage 3.0 3.3 3.6 [V]
IDD LCD Drive Current - 1200 1500 [mA] VDD=3.3v, All Black Pattern
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PDD LCD Drive power
consumption
VDDns Allowable
LCD Drive Ripple
Noise
- 4.5 5 [Watt] VDD=3.3v, All Black Pattern
100 [mV]
p-p
8.0 Power ON/OFF Sequence
VDD power and lamp on/off sequence is as follows. Interface signals are also shown in the chart.
1sec
min.
Vin
Signal
0 V
0 V
10%
90% 90%
10ms max.
10%10%
10%
10%
0 min.0 min.
Lamp
On
0 V
200ms
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)
9.0 Backlight Characteristics
9.1 Signal for Lamp connector
CN2, CN4 CN3, CN5
Pin # Signal name Pin # Signal name
1 Lamp High Voltage 1 Lamp High Voltage
2 Lamp High Voltage 2 Lamp High Voltage
3 No connection 3 Lamp High Voltage
4 Ground 4 Lamp High Voltage
9.2 Parameter guide line for CCFL Inverter
Symble Parameter Min Typ Max Units Condition
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IRCFL CCFL operation range 2.0 5.0 9 [mA]
rms
FCFL CCFL Frequency 25 - 100 [KHz]
ViCFL
(25)
(reference)
VCFL CCFL Discharge Voltage
PCFL CCFL Power consumption
Note 1: CCFL Frequency should be carefully determined to avoid interference between inverter and TFT LCD
Note 2: Calculator value for reference (IRCFL×VCFLx2=PCFL)
Note 3: CCFL inverter should be able to give out a power that has a generating capacity of over 1300 voltage.
Note 4: CCFL life time 50,000hr at 5mA,it’s defined as when the brightness is reduced by half.
CCFL Ignition Voltage
680+10%
(Reference)
@ 5mA (excluding
inverter
Lamp units need 1300 voltage minimum for ignition
To exceed 5.0mA,life time will drop down dramatically.
320+10%
1.8
[Volt]
rms
rms
[Watt] (Ta=25)
[Volt]
(Ta=25)
Note 4
(Ta=25)
Note 1
(Ta= 25)
Note 3
(Ta=25)
Note 2
Note 2
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10.0 Vibration,Shock,and Drop
10.1 Vibration & Shock
The module shall work error free after following vibration and shock condition. Likewise the module shall not sustain
any damage after vibration and shock test.
10.1.1 Vibration Test Spec:
Frequency:10 - 200Hz
Sweep: 30 Minutes each Axis (X, Y, Z)
Acceleration: 1G(10~200Hz P- P)
Test method:
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Acceleration (G)
Frequency (Hz)
Active time (min)
10.1.2 Shock Test Spec:
Acceleration (G)
Active time(ms)
Wave form
Times
Direction: X , Y, Z
10.2 Drop
Package test: The drop height is defined as 60 cm.
(1 corner,3 edges,6 flat faces)
-- No damage and defect found for panel.
1
10~200~10
30
20
20
Half-sin
1
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11.0 Environment
The display module will meet the provision of this specification during operating condition or after storage or
shipment condition specified below. Operation at 10% beyond the specified range will not cause physical
damage to the unit.
11.1 Temperature and Humidity
11.1.1 Operating Conditions
The display module operates error free, when operated under the following conditions;
Temperature 0
Relative Humidity 20% to 85%
Wet Bulb Temperature 39.0
11.1.2 Shipping Conditions
The display module operates error free, after the following conditions;
Temperature -20
Relative Humidity
Wet Bulb Temperature 39.0
5% to 95%
0
C to 500C
0
C
0
C to 600C
0
C
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11.2 Atmospheric Pressure
The display assembly is capable of being operated without affecting its operations over the pressure range as
following specified:
Pressure Altitude
Maximum Pressure 1040 hPa 0 m = sea level
Minimum Pressure 601 hPa 3658 m = 12,000 feet
Note: Non-operation altitude limit of this display module = 40,000 feet. = 12193 m.
11.3 Thermal Shock
The display module will not sustain damage after being subjected to 100 cycles of rapid temperature change. A
cycle of rapid temperature change consists of varying the temperature from -20
Thermal shock cycle
Power is not applied during the test. After temperature cycling, the unit is placed in normal room ambient for at
least 4 hours before powering on.
0
-20
C for 30min
0
60
C for 30min
0
C to 600C, and back again.
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12.0 Reliability
This display module and the packaging of that will comply following standards.
12.1 Failure Criteria
The display assembly will be considered as failing unit when it no longer meets any of the requirements stated
in this specification. Only as for maximum white luminance, following criteria is applicable.
Maximum white Luminance shall be 75 cd/m
12.2 Failure Rate
The average failure rate of the display module (from first power-on cycle till 1,000 hours later) will not
exceed1.0%. The average failure rate of the display module from 1,000 hours until 10,000 hours will not
exceed 0.70% per 1000 hours.
12.2.1 Usage
The assumed usage for the above criteria is:
220 power-on hours per month
500 power on/off cycles per month
Maximum brightness setting
Operation to be within office environment (25
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2
or more.
0
C typical)
12.2.2 Component De-rating
All the components used in this device will be checked the load condition to meet the failure rate criteria.
12.3 CCFL Life
The assumed CCFL Life will be longer than 50,000 hours under stable conditi
Standard current at 5.0 0.5 mA
Definition of life: brightness becomes 50% or less than the minimum luminance value of CCFL.
on at 2550C;
12.4 ON/OFF Cycle
The display module will be capable of being operated over the following ON/OFF Cycles.
ON/OFF Value Cycle
+VDD and CCFL power 36,000 10 seconds on / 10 seconds off
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13.0 Safety
13.1 Sharp Edge Requirements
There will be no sharp edges or corners on the display assembly that could cause injury.
13.2 Materials
13.2.1 Toxicity
There will be no carcinogenic materials used anywhere in the display module. If toxic materials are used, they
will be reviewed and approved by the responsible AUO Toxicologist.
13.2.2 Flammability
All components including electrical components that do not meet the flammability grade UL94-V1 in the module
will complete the flammability rating exception approval process. The printed circuit board will be made from
material rated 94-V1 or better. The actual UL flammability rating will be printed on the printed circuit board.
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14.0 Other requirements
14.1 Smoke Free Design
Any smoke nor strange smell shall not be observed by the operator at any single failure.
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Outline Dimensions
unit:mm
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16. LITEMAX LI2203 inverter
(1). Introduction
LI2203 is a CCFL inverter to operate LITEMAX ultra brightness (UB) backlights. The inverter
has an on-board pulse width modulation (PWM) dimming circuit for extremely wide range
luminance adjustment. Over the entire dimming range, there is no noticeable lamp flickering
and the uniformity of the backlight is well maintained. When using LI2203 with LITEMAX LCD
modules, it is not necessary to synchronize the PWM circuit to vertical sync signal of the LCD.
(2). Dimming Control
The LI2203 accepts a 0-5V analog voltage for dimming control. It has a pulse width modulation
(PWM) dimming circuit for luminance adjustment. As the dimming voltage Vd decreases from
+5V, the lamp current waveform is pulse width modulated at a repetition rate high enough to
prevent LCD flicker. Within each PWM cycle, the lamps in the backlight are turned fully 'ON'
for a fraction of the cycle time. The human eyes, being very slow with respect to the PWM rate,
respond to the average light produced over the PWM cycle. As a result, the luminance of the
backlight and/or the LCD screen is approximately to the duty cycle of the PWM waveform.
Lamp Current Waveform
t (lamp on)
T (1 PWM cycle) Duty Cycle = t / T
The lamp current waveform with the PWM circuit set at less than 100%
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In general, inverters with PWM dimming have a very wide luminance adjustment range. For
most practical cases, the LI2203 inverter can achieve a dimming ratio up to 200:1. Hence, the
luminance of the backlight or LCD screen can be adjusted from 100% to 0.5%.
The 0- 5V dimming voltage can be generated simply by a potentiometer, by a digitally
controlled UP/DOWN counter or a digital potentiometer. The inverter provides a regulated +5V
supply to power the dimming circuit. However, the maximum current drain from this source
should be kept less than 5 mA.
At a Vd input about 0.34V and less, the duty cycle of the PWM waveform is 0% and thus, the
lamps are 'OFF'. In order to fully utilize the available dimming voltage, Vd should be biased to
about 0.34V and then ramping up to 5.0V.
(3). Electrical Characteristics
The LI2203 inverter operates at 12V DC input and can drive up to 12 lamps for a maximum
output power about 40 Watts. In addition, the inverter has a regulated +5V output serving as a
voltage source for the dimming control circuit.
Parameters Min Typ Max Units Conditions
Input Voltage (Vin) 11.5 12 12.5 Vdc
Input current (I) 3.8 Adc
Lamp Starting Voltage (Vst) 1300 Vrms
Vin=12, Vd=5 V
Vin=12, Vd=5 V
Frequency (f) 55 58 60 Khz
ON/OFF Control -OFF 0.2 Vdc
-ON
Floating*
Dimming Voltage(Vd)
@ 100% Duty Cycle 4.9 5 Vdc
@ 0% Duty Cycle 0.34 0.36 Vdc
5V Output (+5VOUT) 4.85 5 5.25 Vdc
Max brightness
Zero brightness
11.5<Vin<12.5V
5V Output Source Current 5 mA
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Absolute Maximum Rating
Parameters Min Max Units
Inverter Input Voltage (Vin) 11 13 Vdc
Operating Temperature Range 0 50 C
Storage Temperature Range -20 80 C
(4). Interface Connector
Input Connector (CN1)
Pin# Function
1 5V Output
2 12V Input
3 12V Input
4 Dimming Control
5 Ground
6 Ground
7 ON/OFF Control
Output Connector ( CN2, CN4 )
PIN# Function
1, 2 Lamp Connection
3 No connection
4 Lamp Common
Output Connector (CN3, CN5)
PIN# Function
1, 2, 3, 4 Lamp Connection
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(5). Mechanical
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