Microsemi Corporation LXM1640-01 Datasheet

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1640

LXM1640-01

DIRECT DRIVE QUAD LAMP CCFL INVERTER MODULE

THE INFINITE POWER OF INNOVATION

DESCRIPTION KEY FEATURES

The Quad Output Module Ideal for
Desktop and Industrial Applications.

The LXM1640 Direct Drive

TM

Cold Cathode
Fluorescent Lamp (CCFL) Inverter is a single
module designed to drive four lamps and
is targeted for use with desktop Liquid Crys­tal Display (LCD) and industrial LCD pan­els typically ranging in size from 14-inches
to 21-inches. This four output inverter is
the ideal solution to power virtually any
four lamp application.

Direct Drive Technology. The mod­ule design is based on a new Direct Drive
topology, which provides a number of cost
and performance advantages. The
LXM1640-01 Direct Drive inverters eliminate
the classic resonant inductor and capaci­tors, thus reducing cost and allowing a sub­stantial reduction in module size.

Fixed-Frequency Operation. 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.

Fail-safe Feature For Multiple Lamp
Applications. Our multi-output inverters

are designed to keep your application op-

erating at near normal brightness in the
event that a lamp fails. This allows the
display to remain "on-line" until lamp re­placement is convenient.

Quad Module Uses Standard Power

Supply. The LXM1640 module uses a stan-

dard 12V input supply. It also ensures
nominal power consumption with 4 lamps
requiring only 16 watts. Lamp current is
fully regulated with respect to input volt­age and output impedance variations.

Dimming Features. The LXM1640 mod­ules are equipped with a dimming input
that permits brightness control from an
external potentiometer or DC voltage. In
addition, the sleep input reduces module
power to a few microwatts in shut down
mode. All LXM1640 modules feature both
output open and short-circuit protection.

The Most Efficient and Cost-effective
Backlight Inverter for Desktop/Indus­trial Applications. Linfinity's proprietary

Direct Drive architecture is the highest ef­ficiency, small form factor solution for all
multiple lamp applications. The LXM1640
is fully customizable (electronically and me­chanically) to specific customer require­ments.

P RELIMINARY DATA SHEET

■ Drive Four Lamps With One Module

■ Small, Compact Size

■ High Efficiency

■ Multiple Output Connectors Provide Easy

LCD Connections

■ Low EMI And Noise

■ Low Power Sleep Mode

■ Output Short And Open Circuit Protection

■ 3:1 Dimming Control

■ Adjustable Lamp Current Up To 6.0mA Per

Lamp

■ Long Lamp Life With Soft-Start And

Accurate Lamp Current Regulation

APPLICATIONS

■■

■ Desktop LCD Monitors And Panels

■■

■■

■ Industrial LCD Panels

■■

■■

■ Hi-Brite Displays

■■

BENEFITS

■■

■ Cool Operation

■■

■■

■ Smooth, Easy-To-Use Brightness Control

■■

■■

■ Single 12 Volt Supply

■■

IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.

PRODUCT HIGHLIGHT

LXM1640 "UNIVERSAL" MODULE CONNECTION OPTIONS

Quad Connector Configuration Dual Connector Configuration

CN7CN6

CN2

CN5 CN4

CN1

LXM1640-01

CN3

CN7 CN6

CCFL Lamps

Desktop Display

MODULE ORDER INFORMATION

LXM1640-01

CN3

CN1

LXM1640-01

CN5CN4

CN2

CCFL Lamps

Desktop Display

Copyright © 1998
Rev. 0.4 5/98

L INFINITY MICROELECTRONICS INC.

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: [phone]

1

PRODUCT DATABOOK 1996/1997

LXM1640-01

DIRECT DRIVE QUAD LAMP CCFL INVERTER MODULE

RELIMINARY DATA SHEET

P

ABSOLUTE MAXIMUM RATINGS (Note 1)

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

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

Output Current (per Lamp) ........................................................................................................................ 10.0mA

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

Input Signal Voltage, (SLEEP and BRITE Inputs) ..................................................................................................................... -0.3V to V

Ambient Operating Temperature, zero airflow ........................................................................................................................0°C to 40°C

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
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

IN

O

BRT ADJ

LAMP

OLAMP

A

Recommended Operating Conditions

Min. R.C. Max.

10.8 12 13.2 V
45W

0.0 5.0 V

300 675 800 V

6.0 mA

040°C

(Internally Limited)

RMS

RMS

IN

Units

RMS

RMS

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1640.

Parameter

Symbol

Test Conditions Units

LXM1640-01

Min. Typ. Max.

Output Pin Characteristics

Full Bright Lamp Current (per Lamp) I
Minimum Lamp Current (per Lamp) I

(Note 2)

Lamp Start Voltage V
Operating Frequency f

L (MAX)VBRT ADJ

L (MIN)VBRT ADJ

LS

O

= 5.0VDC, SLEEP = HIGH, VIN = 12V
= 0VDC, SLEEP = HIGH, VIN = 12V

0°C < TA < 40°C, V
V

= 5.0VDC, SLEEP = HIGH, VIN = 12V

BRT ADJ

≥ 10.8V

IN

DC

DC

DC

DC

5.4 6.0 6.6 mA

0.5 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

V

BRT ADJ

I

O (LAMP)

I

O (LAMP)

= 0V

DC

= 100%

= Minimum

BRT

C

C

27 30 33 µA

5.0 V
0V

SLEEP Input

RUN Mode V
SLEEP Mode V

Input Current I

SLEEP (HI)

SLEEP (LO)

SLEEP

SLEEP = 5.0V

2.2 V

IN

-0.3 0.8 V

90 110 150 µA

Power Characteristics

Sleep Current I

IN (MIN)VIN

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

= 12VDC , SLEEP = 0V

DC

0 10 500 µA

RMS

RMS

RMS

DC

DC

DC

V

DC

DC

DC

DC

2

Copyright © 1998

Rev. 0.4 5/98