Microsemi Corporation LXM1621-02, LXM1621-01, LXM1621-03 Datasheet

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T HE I NFINITE P OWER OF I NNOVATION

DESCRIPTION KEY FEATURES

RangeMAX Wide Range Dimming, Dual Output Inverter. The LXM1621 Direct

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

Similar to the LXM1620, the LXM1621 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 LXM1620 or any traditional dimming CCFL inverters, the LXM1621 provides the designer a vastly superior display brightness range. 1000:1+ brightness range is achievable with a standard LCD display (see Product Highlight). 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 as great as 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).

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.

Direct Drive Technology. The module

design is based on a new Direct Drive topology, which provides a number of cost and performance advantages. The LXM1621-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 LXM1621 modules feature both open and shorted lamp protection.

The LXM1621 is fully customizable (electronically and mechanically) to specific customer requirements.

RangeMAX

LXM1621-xx

DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE

P RELIMINARY DATA SHEET

■ RangeMAX Wide Range Dimming

■ 8V To 18V 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 Lamp Run Voltage Lamp Current

LXM1621-01 500 - 750V

LXM1621-02 350 - 500V

LXM1621-03 350 - 500V

RMS

7mA

6mA

6.5mA

L INF INITY MICROELECTRONICS INC.

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

P ATENT PENDING

PRODUCT DATABOOK 1996/1997

LXM1621-xx

RangeMAX

DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE

P RELIMINARY DATA SHEET

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Supply Voltage (VIN)........................................................................................................................................................ -0.3V to 18V

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) V Input Supply Voltage (Fully Regulated Lamp Current) Output Power (per Lamp) LXM1621-01 P

LXM1621-02/-03

Brightness Control Input Voltage Range V Lamp Operating Voltage LXM1621-01 V

LXM1621-02/-03

Lamp Current (Full Brightness - per Lamp) LXM1621-01 I

LXM1621-02 LXM1621-03

Operating Ambient Temperature Range T

BRT ADJ

LAMP

OLAMP

Recommended Operating Conditions

Min. R.C. Max.

81218V

10.2 12 13.8 V 45W

2.5 3 W

0.0 2.5 V 500 625 750 V

350 425 500 V

7.0 mA

6.0 mA

6.5 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 LXM1621-xx.

Parameter

Symbol

Test Conditions Units

LXM1621-xx

Min. Typ. Max.

Output Pin Characteristics

Full Bright Lamp Current 1621-01 I

(per Lamp)

1621-02 V

L (MAX)VBRT ADJ

1621-03 V

Minimum Lamp Current (per Lamp) I

L (MIN)VBRT ADJ

(Notes 2 & 3) V Lamp Start Voltage V Operating Frequency f

= 2.5VDC, SLEEP = HIGH,

= 2. 5VDC, SLEEP = HIGH,

BRT ADJ

= 2. 5VDC, SLEEP = HIGH,

BRT ADJ

Burst Duty = 100%, VIN = 12V

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

BRT ADJ

0°C < TA < 40°C, VIN ≥ 10.8V V

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

BRT ADJ

Burst Duty = 0.5%, VIN = 9V

6.3 7.0 7.7 mA

5.5 6.0 6.5 mA

5.7 6.5 7.1 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. 0.6 2/00

PRODUCT DATABOOK 1996/1997

P ATENT PENDING

RangeMAX

DIGITAL DIMMING DUAL 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.

Conn. Pin Description

CN1

CN1-1 CN1-2

CN1-3 CN1-4

CN1-5 SLEEP

CN1-6 BRITE

CN1-7, 8

GND

SYNC

Input Power Supply. (8V ≤ VIN ≤ 18V)

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

CN2 thru CN5: Refer to Figure 2

Symbol

SYNC (HI)

SYNC (LO)

SYNC

IN (MIN)VIN

= 12VDC , SLEEP ≤ 0.8V

FUNCTIONAL PIN DESCRIPTION

). 2.5VDC gives maximum lamp current.

SYNC

LXM1621-xx

Test Conditions Units

< 150Hz

LXM1621-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

CN2

(Bottom Side)

0.24 (6)

0.338 (8.6) Max.

PHYSICAL DIMENSIONS

All dimensions are in inches (mm)

CN4

1.50 (38) 1.89 (48)

0.060 (1.52) max.

LXM1621-xx

4.88 (124)

CN1

CN3

(Bottom Side)

1.26 (32)

CN5

Ø 0.12 (3.0)

Grounded Mounting Hole - 2 plcs

Warning!!

High Voltage Present

At All Output

Connectors

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