Microsemi Corporation LXM1641-03, LXM1641-02, LXM1641-01 Datasheet

RangeMAX

LXM1641-01/-02/-03

DIGITAL DIMMING QUAD LAMP CCFL INVERTER MODULE

T HE I NFINITE P OWER OF I NNOVATION

DESCRIPTION KEY FEATURES

RangeMAX Wide Range Dimming, Quad Output Inverter. The LXM1641 Direct

DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically designed for driving LCD backlight lamps.

Similar to the LXM1640, the LXM1641 excels in applications where critical parameters include very wide range dimmability, high efficiency and reliable fail-safe design in a small form factor. These 12 volt input modules are specifically designed with desktop and industrial applications in mind.

Unlike the LXM1640 or any traditional dimming CCFL inverters, the LXM1641 provides the designer a vastly superior display brightness range. 1000:1+ brightness range is achievable with a standard LCD display (see Application Section). Our wide range dimming provides exceptional display readability at less than 1% of full brightness, allowing both power savings and low ambient light operating capability (i.e. "night readable").

RangeMAX Digital Dimming Technique. Digital dimming provides flicker-free

brightness control in any wide-range dimming application. Dimming ratios greater than 1000:1 can be achieved. Incorporation of a video synchronization feature allows wide ratio dimming without the display disturbances and interference seen with competitive products.

The modules are equipped with a dimming input that permits brightness control from an external potentiometer or DC voltage source. The resultant "burst drive" that energizes the

lamp was designed specifically to ensure that no premature lamp degradation occurs (see "How RangeMAX Works" Section).

Failsafe Feature For Multiple Lamp Ap-

plications. 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.

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 LXM1641-xx Direct Drive inverters eliminate the classic resonant inductor and capacitors, thus reducing cost and allowing a substantial reduction in module size.

Universal Connector Configuration.

Linfinity's multiple lamp inverters include a built in connector array for the most common LCD lamp configurations.

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 LXM1641 modules feature both open and shorted lamp protection.

The LXM1641 is fully customizable (electronically and mechanically) to specific customer requirements.

US Patent Numbers: 5923129 & 5930121

P RELIMINARY DATA SHEET

■ RangeMAX Wide Range Dimming

■ 8V to 16V Input Voltage Range

■ Small Form Factor

■ Easy To Use Brightness Control

■ MicroAmp SLEEP Mode

■ Output Short-Circuit Protection And

Automatic Strike-Voltage Regulation

■ Fixed Frequency Operation

■ Universal Connector Configuration

APPLICATIONS

■ Hi-Brite Displays

■ Desktop Displays

■ Low Ambient Light Conditions (i.e. Aircraft

Cabins, Automobile)

■ Industrial Applications

BENEFITS

■ High Efficiency Reduces Heating Problems

■ Smooth, Flicker Free 0-100% Full-Range

Brightness Control Gives Your Product A High Quality Image

■ Output Open Circuit Voltage Regulation

Minimizes Corona Discharge For Long Life And High Reliability

■ Power Efficient, "Low Brightness" Capability

Allows For Advanced Power Management

NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.

MODULE ORDER INFORMATION

Part Number Application

LXM1641-01

LXM1641-02

LXM1641-03

Quad Lamp Panels

Sharp 18.1" Panel JST XHP-9 (9-pin)

LG Electronics 18.1" Panel JST BHSR-02VS-1 (2-pin)

Inverter Mates Directly

to Panel Connectors

JST BHR-03VS-1 (3-pin) &

JST BHR-04VS-1 (4-pin)

L INF INITY MICROELECTRONICS INC.

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570

PRODUCT DATABOOK 1996/1997

LXM1641-01/-02/-03

RangeMAX

DIGITAL DIMMING QUAD LAMP CCFL INVERTER MODULE

P RELIMINARY DATA SHEET

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Supply Voltage (VIN)....................................................................................................................................................... -0.3V to 16V

Output Voltage, no load ..............................................................................................................................Internally Limited to 1800V

Output Current ............................................................................................................................................ 10.0mA

Output Power (per Lamp) .................................................................................................................................................................... 6.0W

Input Signal Voltage (BRITE Input) ....................................................................................................................................... -0.3V to 6.5V

Input Signal Voltage (SLEEP, V

Ambient Operating Temperature .................................................................................................................................................... 0°C to 70°C

Inputs) ................................................................................................................................... -0.3V to V

SYNC

Storage Temperature Range ......................................................................................................................................................... -40°C to 85°C

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.

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

Symbol

Input Supply Voltage Range (Functional) LXM1641-01, -02

LXM1641-03

Input Supply Voltage LXM1641-01, -02

(Fully Regulated Lamp Current) LXM1641-03 Output Power (per Lamp) P Brightness Control Input Voltage Range V Lamp Operating Voltage V Lamp Current (Full Brightness - per Lamp) I Operating Ambient Temperature Range T

BRT ADJ

LAMP

OLAMP

Recommended Operating Conditions

Min. R.C. Max.

81216V

10 12 14 V

91216V

10.8 12 13.2 V 45W

0.0 2.5 V

300 675 800 V

7.0 mA

070°C

(Internally Limited)

RMS

Units

RMS

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1641.

Parameter

Symbol

Test Conditions Units

LXM1641-xx

Min. Typ. Max.

Output Pin Characteristics

Full Bright Lamp Current 1641-01,-02

(per Lamp) 1641-03

Minimum Lamp Current (per Lamp) I

(Notes 2 & 3)

Lamp Start Voltage V Operating Frequency f

L (MAX)VBRT ADJ

BRT ADJ

L (MIN)VBRT ADJ

BRT ADJ

0°C < TA < 40°C, V

BRT ADJ

= 2.5VDC, SLEEP = HIGH, Burst Duty = 100%, VIN = 9V = 2.5VDC, SLEEP = HIGH, Burst Duty = 100%, VIN = 12V = 0VDC, SLEEP = HIGH, Burst Duty = 2%, VIN = 9V = -50mVDC, SLEEP = HIGH,

≥ 10.8V

= 2.5VDC, SLEEP = HIGH, VIN = 12V

Burst Duty = 0.5%, VIN = 9V

6.3 7.0 7.7 mA

7.2 8.0 8.8 mA

0.14 mA

0.035 mA

1500 1800 V

52 57 62 KHz

BRITE Input

Input Current I Input Voltage for Max. Lamp Current V Input Voltage for Min. Lamp Current V

(Note 3) I

BRT

= 0V

BRT ADJ

O (LAMP)

= 100% Duty Cycle = 2% Duty Cycle = 0.5% Duty Cycle

-6 -8 -10 µA

2.5 2.6 V 00V

-50 mV

SLEEP Input

RUN Mode V SLEEP Mode V Input Current I

SLEEP (HI)

SLEEP (LO)

SLEEP

SLEEP = 5.0V

Note 2. Minimum lamp current required to maintain even light output may vary with display panel.

3. See 1000:1 Dimming Application section for details.

2.2 V

-0.3 0.8 V 70 75 100 µA

RMS

Rev. 0.7 12/99

PRODUCT DATABOOK 1996/1997

RangeMAX

LXM1641-01/-02/-03

DIGITAL DIMMING QUAD LAMP CCFL INVERTER MODULE

P RELIMINARY DATA SHEET

ELECTRICAL CHARACTERISTICS (Continued)

Parameter

Characteristics

SYNC

Logic High Level V Logic Low Level V Input Impedance Z Pulse Width (Note 4) t Input Frequency f

Power Characteristics

Sleep Current I

Note 4. The module will be functional with pulse widths much larger than 250µs, but will have limited dimming.

Symbol

SYNC (HI)

SYNC (LO)

SYNC

IN (MIN)VIN

= 12V

, SLEEP ≤ 0.8V

Test Conditions Units

LXM1641-xx

Min. Typ. Max.

4.0 6.5 V

-0.3 1.0 V

60 66 75 kΩ

25 250 µs 49 150 Hz

550µA

PRODUCT DATABOOK 1996/1997

(

)

LXM1641-01/-02/-03

DIGITAL DIMMING QUAD LAMP CCFL INVERTER MODULE

P RELIMINARY DATA SHEET

0.65 (16.5)

CN4

0.30 (7.5)

CN5

1.03

(26.2)

1.05

(26.6)

PHYSICAL DIMENSIONS

LXM1641-01

All dimensions are in inches (mm)

6.39 (161)

5.04 (128)

CN1

Top Side

4.25 (107.925)

1.05

(26.6)

RangeMAX

CN6

0.96

CN7

(24.5)

Ø 0.138 (3.5)

Grounded Mounting Hole - 2 plcs

CN2

0.338 (8.6) Max.

0.13

3.3

0.060 (1.52) max.

Functional Pin Description

Conn. Pin Description

CN1

CN1-1, 2 V

CN1-3, 4 GND

CN1-5 SLEEP

CN1-6 BRITE

CN1-7, 8 V

SYNC

CN2 thru CN7: Refer to Figure 2

Input Power Supply. (8V ≤ VIN ≤ 16V)

Power Supply Return.

ON/OFF Control. (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF)

Brightness Control (-0.3V to 2.5V

Vertical syncronization input. 49Hz < f

Bottom Side

FIGURE 1 — LXM1641-01 Physical Dimensions

). 2.5VDC gives maximum lamp current.

< 150Hz

SYNC

CN3

1.26 (32)

High Voltage Presen

Warning!!

At All Output

Connectors

Rev. 0.7 12/99

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