LXMG1611-01 [MICROSEMI]
Digital Dimming CCFL Inverter Module; 数字调光CCFL逆变器模块
| 型号： | LXMG1611-01 |
| 厂家： | 
Microsemi |
| 描述： | Digital Dimming CCFL Inverter Module |
| 文件： | 总6页 (文件大小：239K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Not Recommended For New Design
RangeMAX™
LXMG1611-01
®
TM
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
KEY FEATURES
DESCRIPTION
RangeMAX™ Wide Range
Dimming
8V to 18V Input Voltage Range
30% Smaller Than CS-ZVS
Models
Easy to Use Brightness Control
MicroAmp SLEEP Mode
Output Short-Circuit Protection
and Automatic Strike-Voltage
Regulation
7.3mm Maximum Module Height,
16mm Module Width
Fixed Frequency Operation
RoHS Compliant
UL 60950 E175910
RangeMAX™ Wide Range Dimming,
The modules are equipped with a
Single Output Inverter. The LXMG1611 dimming input that permits brightness
series of Direct Drive™ CCFL (Cold control from an external potentiometer or
Cathode Fluorescent Lamp) Inverter DC voltage source. The resultant "burst
Modules are specifically designed for drive" that energizes the lamp was designed
driving LCD backlight lamps.
Similar to the LXM1610, the lamp degradation occurs. (See "How
LXMG1611 excels in applications where RangeMAX™ Works" Section)
critical parameters include very wide range
dimmability, high efficiency and reliable convert unregulated DC voltage from the
fail-safe design in a small form factor. system battery or AC adapter directly to
Unlike the LXM1610 or any traditional high frequency, high-voltage waves required
dimming CCFL inverters, the LXMG1611 to ignite and operate CCFL lamps.
provides the designer a vastly superior
display brightness range. 100:1+ design is based on a new Direct Drive
brightness range is achievable with topology, which provides a number of cost
virtually any LCD display. Our wide and performance advantages. The
specifically to ensure that no premature
Wide Input Voltage Range. The modules
Direct Drive Technology. The module
APPLICATIONS
range dimming provides exceptional LXMG1611-01 series Direct Drive™
display readability at less than 1% of full inverters eliminate the classic resonant
brightness, allowing both power savings inductor and capacitors, thus reducing cost
and low ambient light operating capability and allowing a 30% reduction in module
Notebook and Sub-Notebook
Computers
Portable Instrumentation
Desktop Displays
(i.e. "night readable").
size.
Additional Features. Other benefits of
Low Ambient Light Conditions
(i.e. Aircraft Cabins, Automobile)
The LXMG1611 is recommended for
use in panels with low-voltage insulation this new topology are fixed-frequency
on the lamp return wire. operation and secondary-side strike-voltage
RangeMAX™ Digital Dimming regulation.
Technique. Digital dimming provides Strike-voltage regulation minimizes
flicker free brightness control in any wide- corona discharge in the output transformer
range dimming application. Dimming and related circuitry, providing longer life
ratios greater than 100:1 can be achieved. and higher reliability. All LXMG1611
Incorporation of a video synchronization modules feature both open and shorted lamp
feature allows wide ratio dimming without protection.
BENEFITS
High Efficiency and Sleep mode
Feature Extends Computer Battery
Life
Smooth, Flicker Free 1-100% Full-
Range Brightness Control Gives
Product a High Quality Image
Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge for Long Life and High
Reliability
the display disturbances and interference
seen with competitive products.
The LXMG1611 is fully customizable
(electronically and mechanically) to specific
customer requirements.
Power Efficient, “Low Brightness”
Capability Allows for Advanced
Power Management
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected by U.S. Patents: 5,923,129; 5,930,121; Patents Pending
PRODUCT HIGHLIGHT
RangeMAX™ vs. Analog Dimming
RangeMAX™ technology allows the designer to operate in a
lower "brightness" and therefore at lower "power
consumption" than can be reached using traditional analog
dimming inverters.
Dotted line indicates area where panel variations and
parasitics will impact minimum light level with analog
dimming.
Data presented for a RangeMAX™ inverter driving a 13.3"
LCD with a 1.2 Nit to 120 Nit brightness range. The minimum
power levels were 0.4 watts (RangeMAX™) vs. 2.1 watts
(analog dimming) for a power consumption savings of 1.7
watts.
5
4
3
2
1
Standard Analog
Dimming Inverter
Microsemi’s
RangeMAXTM
0
30
45
60
75
90
105
Light Output (Nits)
PACKAGE ORDER INFO
LXMG1611-01
Copyright © 1999
Rev. 1.0b, 2006-11-10
Microsemi
Page 1
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Not Recommended For New Design
RangeMAX™
LXMG1611-01
®
TM
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage (VIN).....................................................................................................................................................-0.3V to 18V
Output Voltage, no load..............................................................................................................................Internally Limited to 1800VRMS
Output Current ..............................................................................................................................................10mARMS (Internally Limited)
Output Power ..........................................................................................................................................................................................6W
Input Signal Voltage (BRITE Input).......................................................................................................................................-0.3V to 6.5V
Input Signal Voltage ( SLEEP , VSYNC(-), VSYNC(+) Inputs) ........................................................................................................-0.3V to VIN
Ambient Operating Temperature Range ................................................................................................................................... 0°C to 70°C
Storage Temperature Range.................................................................................................................................................-40°C to +85°C
Note: 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.
RECOMMENDED OPERATING CONDITIONS
This module has been designed to operate over a wide range of input and output conditions. However, bet 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 function optimally.
LXMG1611-01
Parameter
Symbol
Units
Min
8
R.C.
12
Max
18
Input Supply Voltage Range (Functional)
Input Supply Voltage (Fully Regulated Lamp Current)
Output Power
Brightness Control Input Voltage Range
Lamp Operating Voltage
Lamp Current (Full Brightness)
Operating Ambient Temperature Range
VIN
V
V
W
9
12
16
PO
VBRT ADJ
VLAMP
IOLAMP
TA
4
5
0
2.5
800
V
300
675
7
VRMS
mARMS
°C
0
70
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXMG1611.
LXMG1611-01
Parameter
Symbol
Test Conditions
Units
Min
Typ
Max
`
OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current
VBRT ADJ = 2.5VDC, SLEEP = HIGH,
Burst Duty = 100%, VIN = 9VDC
IL(MAX)
IL(MIN)
6.3
7.0
7.7
mARMS
mARMS
VBRT ADJ = 0VDC, SLEEP = HIGH,
Burst Duty = 2%, VIN = 9VDC
0°C < TA < 40°C, VIN > 7VDC
Minimum Lamp Current (Note 2)
0.14
Lamp Start Voltage
Operating Frequency
VLS
fO
1500
52
1800
62
VRMS
kHz
57
VBRT ADJ = 2.5VDC, SLEEP = HIGH, VIN = 12VDC
`
`
BRITE INPUT
Input Current
Input Voltage for Max. Lamp Current
Input Voltage for Min. Lamp Current
IBRT
VC
VC
VBRT ADJ = 0VDC
IO(LAMP) = 100% Duty Cycle
IO(LAMP) = Minimum Duty Cycle
-10
-12
2.5
0
-14
2.6
0
µADC
VDC
VDC
SLEEP INPUT
RUN Mode
VSLEEP(HI)
VSLEEP(LO)
2.2
VIN
0.8
180
VDC
VDC
SLEEP Mode
Input Current
-0.3
ISLEEP
120
66
µADC
SLEEP = 5V
`
`
VSYNC(-) / VSYNC(+) CHARACTERISTICS
Logic High Level
Logic Low Level
Input Impedance
Pulse Width (Note 3)
Input Frequency
VSYNCH(HI)
VSYNCH(LO)
ZIN
tPW
fSYNC
4.0
-0.3
60
25
49
6.5
1.0
75
250
150
VDC
VDC
kΩ
µs
Hz
POWER CHARACTERISTICS
Sleep Current
IIN(MIN)
10
50
µADC
VIN = 15VDC, SLEEP < 0.8V
Note: 2. Minimum lamp current required to maintain even light output may vary with display panel.
3. The module will be functional with pulse widths much larger than 250µs, but will have limited dimming.
Copyright © 1999
Rev. 1.0b, 2006-11-10
Microsemi
Page 2
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Not Recommended For New Design
RangeMAX™
LXMG1611-01
®
TM
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
FUNCTIONAL PIN DESCRIPTION
Conn.
Pin
Description
CN1
CN1-1
CN1-2
CN1-3
CN1-4
CN1-5
CN1-6
CN1-7
CN1-8
VIN
Input Power Supply (8V < VIN < 18V).
GND
Power Supply Return.
SLEEP
ON/OFF Control. (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF)
VSYNC(-)
VSYNC(+)
Vertical Synchronization Input, negative going
Vertical Synchronization Input, positive going
25µs < tPW < 250µs,
49Hz < fSYNC < 150Hz
CN2
High Voltage connection to high side of lamp. Connect to lamp 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.
CN2-1
CN2-2
VHI
VLO
PHYSICAL DIMENSIONS
100mm (3.93in.)
60mm (2.36in.)
30mm (1.20in.)
52.25mm (2.06in.)
16mm
(0.64in.)
CN2
CN1
3.85mm (0.15in.)
Ø 2.95mm (0.116in.)
Grounded Mounting Hole
7.3mm (0.287in.)
Warning!!
High Voltage
Present
0.79mm (0.031in.)
All dimensions are in millimeters, inches are for reference only.
Connectors:
Recommended Mate
Pins: 50079-8100*, Housing: 51021-0800
CN1
CN2
Molex 53261-0871
*Loose (-8000, Chain) Recommended #26 AWG wiring
JST SM02(8.0)B-BHS-1-TB
Or
Yeon Ho 20015WR-05A00
Pins: 5BH-001T-P0.5, Housing: BHR-03VS-1
Copyright © 1999
Rev. 1.0b, 2006-11-10
Microsemi
Page 3
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Not Recommended For New Design
RangeMAX™
LXMG1611-01
®
TM
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
HOW RANGEMAX™ WORKS
Figure 2 – 2% Burst Duty Cycle
Figure 1 – 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.
Figure 3 – 2% Burst Duty Cycle (Expanded Time Base)
High Voltage
Transformer
VHI
Comparator
VBRITE
+
Transformer
Driver
Ramp
0 - 2.5VDC
-
Ramp Gen
VSENSE
VSYNC(-)
VSYNC(+)
ISENSE
VLO
Figure 4 – RangeMAX™ Block Diagram
Copyright © 1999
Rev. 1.0b, 2006-11-10
Microsemi
Page 4
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Not Recommended For New Design
RangeMAX™
LXMG1611-01
®
TM
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
HOW RANGEMAX™ WORKS (CONTINUED)
On-board 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.
An on-board oscillator operates the inverter BURST rate
above 95Hz, well beyond standard 50/60Hz video refresh
rates where the eye can perceive pulsing light.
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 applications with no access to a vertical sync, the
inverter burst frequency can be allowed to "free run" at
95Hz. 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 inputs are provided for negative and positive
vertical sync pulses so external inversion is not needed.
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.
TYPICAL APPLICAITON
The brightness control may be a simple 10k potentiometer
9-18VDC
VIN
2.5VDC
or a voltage output DAC. A PWM signal from a micro-
controller may also be used with a suitable filter such as
shown in Figure 5A.
10K
VHI
BRITE
If synchronization to the video framerate is desired,
connect the vertical sync pulse from the system video
controller to the appropriate VSYNC input. If the pulse is
CCFL
LAMP
LXMG1611-01
5V
SLEEP
0V
negative going (
positive going (
), connect it to VSYNC(-). If
), connect it to VSYNC(+). If no
VLO
VSYNC(-)
VSYNC(+)
GND
video synchronization is desired, leave both VSYNC(-) and
VSYNC(-)
VSYNC(+)
VSYNC(+) floating.
If you need to turn the inverter ON/OFF remotely,
connect a 3V or 5V logic signal to the SLEEP input. If
remote ON/OFF is not needed, connect the SLEEP input
Figure 5 – Potentiometer Brightness Control
4.99k
PWM Signal
from System
to VIN or any other voltage greater than 2.2VDC
Connect VHI to high voltage wire from the lamp. Connect
LO to the low voltage wire (wire with thinner insulation).
.
BRITE
V
LXMG1611-01
4.99k*
P.W.
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
4.7µF
100µs
.
0 P.W. 100% of Period
* Use 4.99k for 5V PWM amplitude, 15k for 3.3V PWM
amplitude, and omit for 2.5V PWM amplitude.
Figure 5a – PWM Brightness Control
RangeMAX™ Inverters
Also available in Dual
Output LXMG1621-01 and
Quad Output LXMG1643-
12-6x versions for multiple
lamp applications.
Copyright © 1999
Rev. 1.0b, 2006-11-10
Microsemi
Page 5
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Not Recommended For New Design
RangeMAX™
LXMG1611-01
®
TM
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
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 © 1999
Rev. 1.0b, 2006-11-10
Microsemi
Integrated Products Division
Page 6
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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