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INTEGRATED PRODUCTS
LXM1618-05-2x
PRODUCTION DATASHEET
5V 2.2W CCFL Programmable Inverter Module
DESCRIPTION
KEY FEATURES
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The LXM1618-05-2x is a Single Output 2.2W Direct DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Module specifically designed for driving LCD backlight lamps. It is ideal for driving typical 3.9" to 6.4" panels. The maximum output current is externally programmable over a range of 3.5 to 5mA in 0.5mA steps to allow the inverter to properly match to a wide array of LCD panel lamp current specifications. The modules are include a dimming input that permits brightness control from either a DC voltage source, a PWM signal or an external potentiometer. LXM1618 modules unlike the LXM1617 series does not provide wide range `burst' mode dimming, rather dimming is provided by amplitude control of the output current waveform, this limits the potential dim range to typically less than 5:1.
For applications not requiring wide range dimming, amplitude control results in lower ripple on the input supply and reduced potential transient noise generation. Many STN type panels are particularly well suited for current amplitude dimming. The modules convert DC voltage from the system battery or AC adapter directly to high frequency, high-voltage waves required to ignite and operate CCFL lamps. A 3.3V input inverter is also available (LXM1618-03-2x). The modules design is based on Microsemi's new LX1689 backlight controller, which provides a number of cost and performance advantages due to the controller's high level of integration. Other benefits of this new topology are stable fixed-frequency operation, secondary-side strike-voltage regulation and both open and shorted lamp protection with fault timeout.
Externally Programmable Maximum Output Current Easy to Use Brightness Control Output Short-Circuit Protection and Automatic Strike-Voltage Regulation and Timeout Analog Current Amplitude Dimming Method Fixed Frequency Operation Rated From -20 to 70C UL60950 E175910 APPLICATIONS PDA's Portable Instrumentation Industrial Display Controls BENEFITS Compact, Low Profile Design Mates to Wide Variety of LCD Panels Output Open Circuit Voltage Regulation Minimizes Corona Discharge For High Reliability
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
PRODUCT HIGHLIGHT
U
N IV E R S A L
DC
D
OR
IM M IN G
IN P U T
ETER
"P W M ", V
,
P O T E N T IO M
DC Voltage Source
Potentiom eter
PW M Signal
2
3
LXM1618-05 LXM1618-05
S ELECTABLE M
A X IM U M TO
O
UPUT
RMS
C
URRENT
3 .5 M A
5MA
PACKAGE ORDER INFO
PART NUMBER LXM1618-05-21 LXM1618-05-22 LXM1618-05-23
Copyright 2002 Rev. 1.0 2003-10-14
INVERTER MATES DIRECTLY TO PANEL CONNECTORS JST SM02(8.0)B-BHS-1-TB JST BHR-03VS-1 JST SM02B-BHSS-1-TB JST BHSR-02VS-1 Honda QZ-19-A3MYL #02 HONDA QZ-19-3F01 OUTPUT CONNECTOR
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
1
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INTEGRATED PRODUCTS
LXM1618-05-2x
PRODUCTION DATASHEET
5V 2.2W CCFL Programmable Inverter Module
ABSOLUTE MAXIMUM RATINGS (NOTE 1) Input Signal Voltage (VIN1)....................................................................................................................................-0.3V to 6.5V Input Power ...................................................................................................................................................................... 3.0W Output Voltage, no load .............................................................................................................. Internally Limited to 1300RMS Output Current ............................................................................................................................6.5mARMS (Internally Limited) Output Power ................................................................................................................................................................... 2.3W Input Signal Voltage ( SLEEP Input) ....................................................................................................................-0.3V to 5.5V Input Signal Voltage (BRITE) ...............................................................................................................................-0.3V to 5.5V Ambient Operating Temperature, zero airflow.....................................................................................................-20C 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 specified terminal.
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RECOMMENDED OPERATING CONDITIONS (R.C.) 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 Linear BRITE 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 4.75 4.5 0.65 to 0.9 325 3.5 -20 5 5 380 5.25 5.5 2.2 2.0 435* 5.0 70 Units V W V VRMS mARMS C
The minimum VBRT ADJ voltage depends on the panel characteristics, depending on the panel it can vary from 0.65V to 0.9V * Total output power must not exceed 4W. Higher voltage lamps may require maximum output current to be set lower than 5mARMS
ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 25C except where otherwise noted. Parameter
OUTPUT PIN CHARACTERISTICS Full Bright Lamp Current Full Bright Lamp Current Full Bright Lamp Current Full Bright Lamp Current Min. Average Lamp Current Lamp Start Voltage Operating Frequency IL(MAX) IL(MAX) IL(MAX) IL(MAX) IL(MIN) VLS fO VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC ISET1 = Ground, ISET2 = Ground VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC ISET1 = Ground, ISET2 = Open VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC ISET1 = Open, ISET2 = Ground VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC ISET1 = Open, ISET2 = Open VBRT_ADJ =0.65VDC, SLEEP > 2.0V, VIN1 = 5VDC ISET1 = ISET2 = Ground -20C < TA < 70C, VIN1 > 4.5VDC VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 5V 3.0 3.5 4.0 4.5 3.5 4.0 4.5 5 1.5* 1000 85 1100 90 94 4.0 4.5 5.0 5.5 mARMS mARMS mARMS mARMS mARMS VRMS kHz
Symbol
Test Conditions
LXM1618-05-2x Min Typ Max
Units
ELECTRICALS ELECTRICALS
* The inverter is capable of a lower output current than may be recommended by the panel manufacturer. It is the user's responsibility to set the minimum brightness (BRITE) input at or above the panel specification for minimum current.
Copyright 2002 Rev. 1.0 2003-10-14
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
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INTEGRATED PRODUCTS
LXM1618-05-2x
PRODUCTION DATASHEET
5V 2.2W CCFL Programmable Inverter Module
ELECTRICAL CHARACTERISTICS (CONTINUED) Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 25C except where otherwise noted. Parameter
BRITE INPUT Input Current Minimum Input for Max. Lamp Current Minimum Input for Min. Lamp Current SLEEP INPUT RUN Mode SLEEP Mode SET1,2 INPUT SET1,2 Low Threshold Input Current POWER CHARACTERISTICS Sleep Current Run Current Efficiency IIN(MIN) IRUN VIN1 = 5VDC, SLEEP < 0.8V VIN1 = 5VDC, SLEEP 2.0V, ISET1 = Open ISET2 = Ground, VLAMP = 380VRMS VIN1 = 5VDC, SLEEP 2.0V, ISET1 = Open ISET2 = Ground, VLAMP = 380VRMS 0.0 4 430 80 10 ADC mADC % VL ISET VSET 0.4V -300 0.4 V A IBRT VBRT_ADJ VBRT_ADJ VBRT_ADJ = 0VDC VBRT_ADJ = 3VDC IO(LAMP) = Maximum Lamp Current IO(LAMP) = Minimum Lamp Current 0.65* -300 50 2.0 2.05 ADC ADC VDC VDC
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Symbol
Test Conditions
LXM1618-05-2x Min Typ Max
Units
VSLEEP VSLEEP
2.0 -0.3
5 0.8
VDC VDC
* The Inverter is capable of a lower output current than may be recommended by the panel manufacturer. It is the user's responsibility to set the minimum brightness (BRITE) input at or above the panel specification for minimum current. This is likely greater than the 0.65V minimum input.
FUNCTIONAL PIN DESCRIPTION CONN CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8 PIN DESCRIPTION CN1 (Molex 53261-0890) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501 input cable assembly VIN1 GND Main Input Power Supply (4.75V < VIN1 < 5.25V) Power Supply Return ON/OFF Control. (0V < SLEEP < 0.8 = OFF, SLEEP >= 2.0V = ON Brightness Control (0.65V to 2.0VDC). 2.0VDC gives maximum lamp current. SET1 MSB Connecting this pin to ground decreases the output current (see Table 1) SET2 LSB Connecting this pin to ground decreases the output current (see Table 1)
SLEEP
BRITE SET1 SET2
ELECTRICALS ELECTRICALS
CN2 for LXM1618-05-21 and -22 (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 LXM1618-05-23 (Honda QZ-19-A3MYL #02) CN2-3 CN2-1
Copyright 2002 Rev. 1.0 2003-10-14
VHI VLO
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
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INTEGRATED PRODUCTS
LXM1618-05-2x
PRODUCTION DATASHEET
5V 2.2W CCFL Programmable Inverter Module
TABLE 1 SETTING OUTPUT CURRENT OUTPUT CURRENT SETTINGS SET1 (Pin 7) Open* Open* Ground Ground SET2 (Pin 8) Open* Ground Open* Ground Nominal Output Current 5.0mA 4.5mA 4.0mA 3.5mA
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* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS LXM1618-05-2X
86mm 71mm
2.80in 3.39in MOUNTING HOLE
SM02(8.0)B-BHS-1-TB (JST)
2.44MM 0.08 DIA.
CN-1 3.5mm
0.138in.
16mm
0.63in.
1 3
9mm 2mm 0.354 in.
12.5mm 0.492in
CN-2 1
1
11mm
0.433in.
GROUNDED MOUNTING HOLE 2.44MM 0.08 DIA.
60mm 0.2mm
2.36in.
0.8mm
0.0315in.
4.6mm Max
0.181in.
Warning
R1.0
PCB tolerances 0.5mm, M2 or 2-56 recommended mounting screws
High Voltage Present at high side of transformer Weight: (5.7g) typ. and Output Connector
All dimensions are in millimeters, inches are for reference only/ SIMPLIFIED BLOCK DIAGRAM
+3V 10K
High Voltage Transform er Controller and Transform er Driver
V IN1
V BRIT E 0.65 2V DC +3V
V HI
Honda QZ-19-A3MYL #02
SM02B-BHSS-1-TB (JST)
-01
-02
-03
P D PACKAGE DATA
10K SET 1 +3V 10K
OC SENSE
OV SENSE I SENSE
V LO
SET 2
Copyright 2002 Rev. 1.0 2003-10-14
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LAMP
Page 4
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INTEGRATED PRODUCTS
LXM1618-05-2x
PRODUCTION DATASHEET
5V 2.2W CCFL Programmable Inverter Module
TYPICAL APPLICATION
5V DAC or Pot 0.65V 20K to 2.0V 2.7K LXM1618-05-2x BRITE V IN1
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V HI CCFL TUBE
The brightness control may be a voltage output DAC or other voltage source, a digital pot or 20K manual pot. The inverter contains an internal 10K pull-up to 3V to bias the pot add a 2.7K resistor to set the lower threshold voltage. A 3.3V Logic Level PWM signal from a micro-controller may also be used as shown in Figure 1A. If you need to turn the inverter ON/OFF remotely, connect to TTL 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. Use the SET1 and SET2 (see Figure 2) inputs to select the desired maximum output current. Using these two pins in combination allows the inverter to match a wide variety of panels from different manufactures. Generally the best lamp lifetime and efficiency correlates with driving the CCFL at the manufactures nominal current setting. However the SET1 and SET2 inputs allow the user the flexibility to adjust the current to the maximum allowable output current to increase panel brightness at the expense of some reduced lamp life. Although the SET pins are designed such that just leaving them open or grounding them is all that is needed to set the output current, they can also be actively set. Using a open collector or open drain logic signal will allow you to reduce the lamp current for situations where greater dim range is required, as an example in nighttime situations. In conjunction with a light sensor or other timer the panel could be set to higher brightness (maximum output current) for daytime illumination and lower brightness (minimum or typical output current) at nighttime. Since the dim ratio is a factor the peak output current, using this technique the effective dim ratio can be increased. Conversely the SET inputs could be used to overdrive the lamp temporarily to facilitate faster lamp warm up at initial lamp turn on. Of course any possible degradation on lamp life from such practices is the users responsibility as not all lamps are designed to be overdriven. The inverter has a built in fault timeout function. If the output is open (lamp disconnected or broken) or shorted the inverter will attempt to strike the lamp for several seconds. After about 2 seconds without success the inverter will shutdown. In order to restart the inverter it is necessary to toggle the sleep input or cycle the VIN1 input supply.
SLEEP SET 1 SET 2 NC NC
GND
V LO
Figure 1 - Brightness Control (output current set to maximum)
PW M Signal from System P.W .
BRITE
LXM1618-05-2x 10s to 125S ~26% < P.W. < 100% of period
Figure 1A - PWM Brightness Control
5V BRITE V IN1
V HI CCFL TUBE V LO
LXM1618-05-2x SLEEP SET 1 SET 2 GND
APPLICATION APPLICATION
L L H H
L 3.5mARMS H 4.0mARMS L 4.5mARMS H 5.0mARMS L=GND; H=Open
Figure 2 - Max Output Current (SET1 and SET2 Inputs)
Copyright 2002 Rev. 1.0 2003-10-14
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
PanelMatch
INTEGRATED PRODUCTS
LXM1618-05-2x
PRODUCTION DATASHEET
5V 2.2W CCFL Programmable Inverter Module
NOTES
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NOTES NOTES
PRODUCTION DATA - Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time.
Copyright 2002 Rev. 1.0 2003-10-14
Microsemi
Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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