LXM1618-03-23 - Microsemi - Product.Network

RODUCTION

ATASHEET

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

Rev. 1.1a 2005-01-17

WWW.Microsemi .COM

PanelMatch

™

LXM1618-03-2x

3.3V 2.2W CCFL Programmable Inverter Module

INTEGRATED PRODUCTS

DESCRIPTION

The LXM1618-03-2x is a Single

Output 2.2W Direct Drive™ CCFL (Cold

Cathode Fluorescent Lamp) Inverter

Module specifically designed for driving

LCD backlight lamps. It is ideal for

driving typical 3.9” to 6.4” panels.

The maximum output current is

externally programmable over a range of

3.5 to 5mA in 0.5mA steps to allow the

inverter to properly match to a wide array

of LCD panel lamp current specifications.

The modules are include a dimming input

that permits brightness control from either

a DC voltage source, a PWM signal or an

external potentiometer.

LXM1618 modules unlike the

LXM1617 series does not provide wide

range ‘burst’ mode dimming, rather

dimming is provided by amplitude control

of the output cu rrent wavefo rm, this limits

the potential dim range to typically less

than 5:1.

For applications not requiring wide

range dimming, amplitude control results

in lower ripple on the input supply and

reduced potential transient noise

generation. Many STN type panels are

particularly well suited for current

amplitude dimming.

The modules convert DC voltage from

the system battery or AC adapter directly

to high frequency, high-voltage waves

required to ignite and operate CCFL

lamps. A 5V input inverter is also

available (LXM1618-05-2x).

The modules design is based on

Microsemi’s new LX1689 backlight

controller, which provides a number of

cost and performance advantages due to

the controller’s high level of integration.

Other benefits of this new topology

are stable fixed-frequency operation,

secondary-side strike-voltage regulation

and both open and shorted lamp

protection with fault timeout.

IMPORTANT: For the most current data, co nsult MICROSEMI’s website: http://www.microsemi.com

Protected By U.S. Patents: 5,923,129; 5,930,121; 6,198,234; Patents Pending

KEY FEATURES

 Externally Programmable

Maximum Output Current

 Easy to Use Brightness

Control

 Output Short-Circuit

Protection and Automatic

Strike-Voltage Regulation

and Timeout

 Analog Current Amplitude

Dimming Method

 Fixed Frequency Operation

 Rated From -20 to 70°C

 UL60950 E175910

APPLICATIONS

 PDA’s

 Portable Instrumentation

 Industrial Display Controls

BENEFITS

 Compact, Low Profile Design

 Mates to a wide variety of

LCD Panels

 Output Open Circuit Voltage

Regulation Minimizes

Corona Discharge For High

Reliability

PRODUCT HIGHLIGHT

NIVERSAL

IMMING

NPUT

"PWM", V

OTENTIOMETER

DC Voltage

Source Potentiometer PWM

Signal

ELECTABLE

AXIMUM

UPUT

URRENT

3.5

RMS

123

PACKAGE ORDER INFO

ART

UMBER

UTPUT

ONNECTOR

NVERTER

ATES

IRECTLY TO

ANEL

ONNECTORS

LXM1618-03-21 JST SM02(8.0)B-BHS-1-TB or Yeon Ho 20015WR-05A00 JST BHR-03VS-1

LXM1618-03-22 JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00 JST BHSR-02VS-1

LXM1618-03-23 Honda QZ-19-A3MYL #02 Honda QZ-19-3F01

-0

-2

RODUCTION

ATASHEET

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 2

Rev. 1.1a 2005-01-17

WWW.Microsemi .COM

PanelMatch

™

LXM1618-03-2x

3.3V 2.2W CCFL Programmable Inverter Module

INTEGRATED PRODUCTS

ABSOLUTE MAXIMUM RATINGS

(NOTE 1)

Input Signal Voltage (V

IN1

).......................................................................................................................................-0.3V to 5V

Input Power ...................................................................................................................................................................... 3.0W

Output Voltage, no load .............................................................................................................. Internally Limited to 130V

RMS

Output Current ...............................................................................................................................6mA

RMS

(Internally Limited)

Output Power ................................................................................................................................................................... 2.3W

Input Signal Voltage ( SLEEP Input) .......................................................................................................................-0.3V to 5V

Input Signal Voltage (BRITE) ..................................................................................................................................-0.3V to 5V

Ambient Operating Temperature, zero airflow.....................................................................................................-20°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 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.

Recommended Operating Conditions

Parameter Symbol

Min R.C. Max Units

Input Supply Voltage Range (Fully Regulated

Lamp Current) 3 3.3 3.6

Input Supply Voltage Range (Functional)

IN1

2.9 4.2

Output Power P

2.2 W

Linear BRITE Control Input Voltage Range¹ V

BRT_ADJ

0.65 to 0.9 2.0 V

Lamp Operating Voltage V

LAMP

325 380 435* V

RMS

Lamp Current (Full Brightness) I

OLAMP

3.5 5

†

RMS

Operating Ambient Temperature Range T

-20 70 °C

¹The minimum V

BRT ADJ

voltage depends on the panel characteristics, depending on the panel it can vary fr om 0.65V to 0.9V

*Total output power must not exceed 2.2W . Higher voltage lamps may require maximum output current to be set lower than 5mA

RMS

†At voltages below 3.6V the inverter may not be able to output the full 5mA

RMS

in all configurations.

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 25°C

except where otherwise noted.

LXM1618-03-2x

Parameter Symbol Test Conditions Min Typ Max

Units

OUTPUT PIN CHARACTERISTICS

Full Bright Lamp Current I

L(MAX)

BRT_ADJ

> 2.0V

, SLEEP > 2.0V, V

IN1

= 3.3V

SET1

= Ground, I

SET2

= Ground 3.0 3.5 4.0 mA

RMS

Full Bright Lamp Current I

L(MAX)

BRT_ADJ

> 2.0V

, SLEEP > 2.0V, V

IN1

= 3.3V

SET1

= Ground, I

SET2

= Open 3.5 4.0 4.5 mA

RMS

Full Bright Lamp Current I

L(MAX)

BRT_ADJ

> 2.0V

, SLEEP > 2.0V, V

IN1

= 3.3V

SET1

= Open, I

SET2

= Ground 4.0 4.5 5.0 mA

RMS

Full Bright Lamp Current I

L(MAX)

BRT_ADJ

> 2.0V

, SLEEP > 2.0V, V

IN1

= 3.3V

SET1

= Open, I

SET2

= Open 4.5 5 5.5 mA

RMS

Min. Average Lamp Current

L(MIN)

BRT_ADJ

=0.65V

, SLEEP > 2.0V, V

IN1

= 3.3V

SET1

= I

SET2

= Ground 1.5* mA

RMS

Lamp Start Voltage V

-20°C < T

< 70°C, V

IN1

> 3.15V

1000 1100 V

RMS

Operating Frequency f

BRT_ADJ

= 2.5V

, SLEEP > 2.0V, V

IN1

= 3.3V 85 90 94 kHz

* The Inverter is capable of a lower output current than may be recommended by the panel manufacturer. It is the user’s responsibility to set the minimum

brightness (BRITE) input at or above the panel specification for minimum current.

RODUCTION

ATASHEET

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 3

Rev. 1.1a 2005-01-17

WWW.Microsemi .COM

PanelMatch

™

LXM1618-03-2x

3.3V 2.2W CCFL Programmable Inverter Module

INTEGRATED PRODUCTS

ELECTRICAL CHARACTERISTICS (CONTINUED)

Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of

25°C except where otherwise noted.

LXM1618-03-2x

Parameter Symbol Test Conditions Min Typ Max

Units

BRITE INPUT

BRT_ADJ

= 0V

-300 µA

Input Current I

BRT

BRT_ADJ

= 3V

50 µA

Minimum Input for Max. Lamp Current V

BRT_ADJ

O(LAMP)

= Maximum Lamp Current 2.0 2.05 V

Minimum Input for Min. Lamp Current V

BRT_ADJ

O(LAMP)

= Minimum Lamp Current 0.65* V

SLEEP INPUT

RUN Mode

SLEEP

2.0 V

IN1

SLEEP Mode

SLEEP

-0.3 0.8 V

SET

1,2

INPUT

SET

1,2

Low Threshold

0.4 V

Input Current I

SET

≤ 0.4V -300 µA

POWER CHARACTERISTICS

Sleep Current I

IN(MIN)

IN1

= 3.3V

, SLEEP < 0.8V 0.0 3 10 µA

Run Current I

RUN

IN1

= 3.3V

, SLEEP ≥ 2.0V, I

SET1

= Open

SET2

= Ground, V

LAMP

= 380V

RMS

690 mA

Efficiency η V

IN1

= 3.3V

, SLEEP ≥ 2.0V, I

SET1

= Open

SET2

= Ground, V

LAMP

= 380V

RMS

75 %

* The Inverter is capable of a lower output current than may be recommended by the panel manufacturer. It is the user’s responsibility to set the minimum brightness

(BRITE) input at or above the panel specification for minimum current. This is likely greater than the 0.65V minimum input

FUNCTIONAL PIN DESCRIPTION

ONN

ESCRIPTION

CN1

(Molex 53261-0890) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501 input cable assembly

CN1-1

CN1-2 V

IN1

Main Input Power Supply (3V < V

IN1

< 3.6V)

CN1-3

CN1-4 GND Power Supply Return

CN1-5

SLEEP

ON/OFF Control. (0V <

SLEEP

< 0.8 = OFF,

SLEEP

≥ 2.0V = ON

CN1-6 BRITE Brightness Control (0.65V to 2.0V

). 2.0V

gives maximum lamp current.

CN1-7 SET

SET

MSB Connecting this pin to ground decreases the output current ~ 1mA (see Table 1)

CN1-8 SET

SET

LSB Connecting this pin to ground decreases the output current ~ 0.5mA (see Table 1)

CN2 for LXM1618-03-21 and -22

(JST SM02(8.0)B-BHS-1-TB / Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-TB / Yeon Ho 35001WR-02A00)

CN2-1 V

High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length.

DO NOT connect to Ground.

CN2-2 V

Connection to low side of lamp. Connect to lamp terminal with longer lead length.

DO NOT connect to Ground

CN2 for LXM1618-03-23

(Honda QZ-19-A3MYL #02)

CN2-3 V

High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.

DO NOT connect to Ground.

CN2-1 V

Connection to low side of lamp. Connect to lamp terminal with longer lead length.

DO NOT connect to Ground

RODUCTION

ATASHEET

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 4

Rev. 1.1a 2005-01-17

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PanelMatch

™

LXM1618-03-2x

3.3V 2.2W CCFL Programmable Inverter Module

INTEGRATED PRODUCTS

TABLE 1

OUTPUT CURRENT SETTINGS

SET

(Pin 7) SET

(Pin 8) Nominal Output Current

Open Open 5.0mA

Open Ground 4.5mA

Ground Open 4.0mA

Ground Ground 3.5mA

* If driven by a logic signal it should be open collector or open drain only, not a voltage source.

PHYSICAL DIMENSIONS

LXM1618-03-2X

0.8mm

0.0315in.

Weight: (5.7g) typ.

4.6mm Max

0.181in.

86mm

3.39in

CN1

CN2

11mm

0.433in.

3.5mm

0.138in.

16mm

0.63in.

71mm

2.80in

12.5mm

0.492in

PCB tolerances ± 0.5mm, M2 or 2-56 recommended mounting screws

Warning

High Voltage Present at

high side of transformer

and Output Connector

GROUNDED MOUNTING

HOLE 2.44MM ±0.08 DIA.

MOUNTING HOLE

2.44MM ±0.08 DIA.

60mm ±0.2mm

2.36in.

9mm ±2mm

0.354 in.

R1.0

All dimensions are in millimeters, inches for reference only.

SIMPLIFIED BLOCK DIAGRAM

Controller

and

Transformer

Driver

0.65 -

2VDC

LAMP

VLO

VHI

VBRITE

SET1

High Voltage

Transformer

ISENSE

OVSENSE

SET2

+3V

10K

+3V

VIN1

OCSENSE

RODUCTION

ATASHEET

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 5

Rev. 1.1a 2005-01-17

WWW.Microsemi .COM

PanelMatch

™

LXM1618-03-2x

3.3V 2.2W CCFL Programmable Inverter Module

INTEGRATED PRODUCTS

TYPICAL APPLICATION

LXM1618-03-2x

3.3V

SET

GND

BRITE V

IN1

SLEEP

SET

0.65V

to 2.0V

2.7K

20K

DAC or

Pot

CCFL

TUBE

NC NC

Figure 1 – Brightness Control

(Output current set to maximum)

P.W.

10µs to 125µS

BRITE

LXM1618-03-2x

~26% < P.W. < 100% o f

period

PWM Signal

from System

Figure 1A – PWM Brightness Control

LXM1618-03-2x

SET

GND

SLEEP

SET

CCFL

TUBE

BRITE

3.3V

IN1

L L 3.5mA

RMS

L H 4.0mA

RMS

H L 4.5mA

RMS

H H 5.0mA

RMS

L=GND; H= Open

Figure 2 – Max Output Current

(SET

and SET

Inputs)

 The brightness control may be a voltage output DAC or

other voltage source, a digital pot or 20K manual pot. The

inverter contains an internal 10K pull-up to 3V to bias the

pot add a 2.7K resistor to set the lower threshold voltage.

A 3.3V Logic Level PWM signal from a micro-controller

may also be used as shown in Figure 1A.

 If you need to turn the inverter ON/OFF remotely, connect

to TTL logic signal to the SLEEP input.

 Connect V

to high voltage wire from the lamp. Connect

to the low voltage wire (wire with thinner insulation).

Never connect V

to circuit ground as this will defeat

lamp current regulation. If both lamp wires have heavy

high voltage insulation, connect the longest wire to V

This wire is typically white.

 Use the SET

and SET

(see Figure 2) inputs to select

the desired maximum output current. Using these two pins

in combination allows the inverter to match a wide variety

of panels from different manufactures. Generally the best

lamp lifetime and efficiency correlates with driving the

CCFL at the manufactures nominal current setting.

However the SET

and SET

inputs allow the user the

flexibility to adjust the current to the maximum allowable

output current to increase panel brightness at the expense of

some reduced lamp life .

 Although the SET pins are designed such that just

leaving them open or grounding them is all that is needed to

set the output current, they can also be actively set. Using a

open collector or open drain logic signal will allow you to

reduce the lamp current for situations where greater dim

range is required, as an example in nighttime situations. In

conjunction with a light sensor or other timer the panel

could be set to higher brightness (maximum output current)

for daytime illumination and lower brightness (minimum or

typical output current) at nighttime. Since the dim ratio is a

factor the peak output current, using this technique the

effective dim ratio can be increased. Conversely the SET

inputs could be used to overdrive the lamp temporarily to

facilitate faster lamp warm up at initial lamp turn on. Of

course any possible degradation on lamp life from such

practices is the users responsibility as not all lamps are

designed to be overdriven.

 The inverter has a built in fault timeout function. If

the output is open (lamp disconnected or broken) or shorted

the inverter will attempt to strike the lamp for several

seconds. After about 2 seconds without success the inverter

will shutdown. In order to restart the inverter it is

necessary to toggle the sleep input or cycle the V

IN1

input

supply.

RODUCTION

ATASHEET

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 6

Rev. 1.1a 2005-01-17

WWW.Microsemi .COM

PanelMatch

™

LXM1618-03-2x

3.3V 2.2W CCFL Programmable Inverter Module

INTEGRATED PRODUCTS

NOTES

PRODUCTION DATA – Information contained in this document is proprietary to

Microsemi and is current as of publication date. This document may not be modified in

any way without the express written consent of Microsemi. Product processing does not

necessarily include testing of all parameters. Microsemi reserves the right to change the

configuration and performance of the product and t o discontinue product at any time.