LXM1621-XX Datasheet, PDF(1/8 Page) Microsemi Corporation – DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE

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LXM1621-XX Datasheet, PDF (1/8 Pages) Microsemi Corporation – DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE

TH E IN F I N I T E PO W E R O F IN N O VAT I O N

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RangeMAXTM

LXM1621-xx

DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE

PRELIMINARY DATA SHEET

DESCRIPTION

RangeMAX Wide Range Dimming, Dual

Output Inverter. The LXM1621 Direct

DriveTM CCFL (Cold Cathode Fluorescent

Lamp) Inverter Modules are specifically de-

signed for driving LCD backlight lamps.

Similar to the LXM1620, the LXM1621 ex-

cels in applications where critical parameters

include very wide range dimmability, high ef-

ficiency and reliable fail-safe design in a small

form factor. These 12 volt input modules are

specifically designed with desktop and indus-

trial applications in mind.

Unlike the LXM1620 or any traditional

dimming CCFL inverters, the LXM1621 pro-

vides 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 operat-

ing capability (i.e. "night readable").

RangeMAX Digital Dimming Tech-

nique. 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 distur-

bances and interference seen with competi-

tive 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 conve-

nient.

Direct Drive Technology. The module

design is based on a new Direct Drive topol-

ogy, which provides a number of cost and

performance advantages. The LXM1621-xx

Direct Drive inverters eliminate the classic

resonant inductor and capacitors, thus reduc-

ing 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 com-

mon LCD lamp configurations.

Additional Features. Other benefits of

this new topology are fixed-frequency opera-

tion and secondary-side strike-voltage regu-

lation.

Strike-voltage regulation minimizes corona

discharge in the output transformer and re-

lated circuitry, providing longer life and higher

reliability. All LXM1621 modules feature

both open and shorted lamp protection.

The LXM1621 is fully customizable (elec-

tronically and mechanically) to specific cus-

tomer requirements.

KEY FEATURES

I RangeMAX Wide Range Dimming

I 8V To 18V Input Voltage Range

I Small Form Factor

I Easy To Use Brightness Control

I MicroAmp SLEEP Mode

I Output Short-Circuit Protection And

Automatic Strike-Voltage Regulation

I Fixed Frequency Operation

I Universal Connector Configuration

A P P L I C AT I O N S

I Hi-Brite Displays

I Desktop Displays

I Low Ambient Light Conditions (i.e. Aircraft

Cabins, Automobile)

I Industrial Applications

BENEFITS

I High Efficiency Reduces Heating Problems

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

Brightness Control Gives Your Product A

High Quality Image

I Output Open Circuit Voltage Regulation

Minimizes Corona Discharge For Long Life

And High Reliability

I 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

LXM1621-02

LXM1621-03

500 - 750VRMS

350 - 500VRMS

7mA

6mA

6.5mA

LINFINITY MICROELECTRONICS INC.

Rev. 0.6 2/00

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

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