Microsemi Corporation LXM1620-03, LXM1620-02, LXM1620-01 Datasheet

DESCRIPTION KEY FEATURES

■ Drive Two Lamps With One Module

■ Small, Compact Size

■ High Efficiency

■ Multiple Outputs 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

This allows the display to remain "on-line" until
lamp replacement is convenient.

Dual Module Uses Standard Power

Supply. The LXM1620 module uses a standard

12V ±10% input supply. It also ensures nomi­nal power consumption with 2 lamps requiring
only 8 watts. Lamp current is fully regulated
with respect to input voltage and output imped­ance variations.

Dimming Features. The LXM1620 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 LXM1620 modules fea­ture both output open and short-circuit protec­tion. The Most Efficient and

Cost-effective Backlight Inverter for Desk­top/Industrial Applications. Linfinity's pro-

prietary Direct Drive architecture is the highest
efficiency, small form factor solution for all
multiple lamp applications. The LXM1620 is
fully customizable (electronically and mechani­cally) to specific customer requirements.

1

US Patent Numbers: 5923129 & 5930121

The Dual Output Module Ideal for
Desktop and Industrial Applications. The

LXM1620 Direct DriveTM Cold Cathode Fluo­rescent Lamp (CCFL) Inverter is a single mod­ule designed to drive two lamps and is targeted
for use with desktop Liquid Crystal Display
(LCD) and industrial LCD panels typically rang­ing in size from 10.4-inches to 17-inches. This
two output inverter is the ideal solution to power
virtually any two lamp application.

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 LXM1620-01
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 de-

signed to keep your application operating at near
normal brightness in the event that a lamp fails.

PRODUCT HIGHLIGHT

DIRECT DRIVE DUAL LAMP CCFL INVERTER MODULE

P RELIMINARY DATA SHEET

T HE I NFINITE P OWER OF I NNOVATION

LXM1620-01

BENEFITS

■■

■■

■ Cool Operation

■■

■■

■ Smooth, Easy-To-Use Brightness Control

■■

■■

■ Single 12 Volt Supply

LXM1620 "UNIVERSAL" MODULE CONNECTION OPTIONS

CN1

CN2

CN3

CCFL Lamps

Desktop Display

CCFL Lamp

LXM1620-01

Desktop Display

CCFL Lamp

CN1

LXM1620-01

CN2

CN3

Copyright © 2000

Rev. 0.9 10/00

1

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

L INF INITY MICROELECTRONICS INC.

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

Dual Connector Configuration Single Connector Configuration

Part Number Lamp Run Voltage Lamp Current

LXM1620-01 500 - 750V

RMS

6mA

MODULE ORDER INFORMATION

DIRECT DRIVE DUAL LAMP CCFL INVERTER MODULE

LXM1620-01

PRODUCT DATABOOK 1996/1997

Copyright © 2000

Rev. 0.9 10/00

2

P RELIMINARY DATA SHEET

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.

Input Supply Voltage Range (Functional) V

IN

Input Supply Voltage (Fully Regulated Lamp Current)
Output Power (per Lamp) LXM1620-01 P

O

Brightness Control Input Voltage Range V

BRT ADJ

Lamp Operating Voltage LXM1620-01 V

LAMP

Lamp Current (Full Brightness - per Lamp) I

OLAMP

Operating Ambient Temperature Range T

A

Parameter

Symbol

Units

Recommended Operating Conditions

Min. R.C. Max.

10.2 12 16 V

10.2 12 13.8 V
45W

0.0 5.0 V

500 625 750 V

RMS

6.0 mA

RMS

070°C

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1620.

Full Bright Lamp Current

1620-01

I

L (MAX)VBRT ADJ

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

DC

(per Lamp)

Minimum Lamp Current (per Lamp) I

L (MIN)VBRT ADJ

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

DC

(Note 2)

Lamp Start Voltage V

LS

0°C < TA < 40°C, VIN ≥ 10.8V

DC

Operating Frequency f

O

V

BRT ADJ

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

DC

Output Pin Characteristics

Parameter

Symbol

Test Conditions Units

LXM1620-xx

Min. Typ. Max.

5.4 6.0 6.6 mA

RMS

0.5 mA

RMS

1500 1800 V

RMS

52 57 62 KHz

BRITE Input

Input Current I

BRT

V

BRT ADJ

= 0V

DC

Input Voltage for Max. Lamp Current V

C

I

O (LAMP)

= 100%

Input Voltage for Min. Lamp Current V

C

I

O (LAMP)

= Minimum

-6 -8 -10 µA

DC

5.0 V

DC

0V

DC

2.2 V

IN

V

DC

-0.3 0.8 V

DC

60 120 180 µA

DC

RUN Mode V

SLEEP (HI)

SLEEP Mode V

SLEEP (LO)

Input Current I

SLEEP

SLEEP = 5.0V

SLEEP Input

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

ABSOLUTE MAXIMUM RATINGS (Note 1)

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

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

RMS

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

RMS

(Internally Limited)

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

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

IN

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

Power Characteristics

Sleep Current I

IN (MIN)VIN

= 12VDC , SLEEP = 0V

DC

0150µA

DC