LXMG1618A-05-21 - Microsemi Corporation

RODUCTION

ATASHEET

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570

Page 1

Rev. 1.1,2009-11-03

WWW.Microsemi .COM

PanelMatch

™

"A Series" LXMG1618A-05-2x

5V 2.2W CCFL Programmable Inverter Module

TM ®

DESCRIPTION

The LXMG1618A-05-2x™ is a Single

Output 2.2W Direct Drive™ CCFL (Cold

Cathode Fluorescent Lamp) Inverter

Module designed for driving LCD

backlight lamps. It is ideal for driving

typically 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 (PanelMatch)

to allow the inverter to properly match to a

wide array of LCD panel lamp current

specifications. The modules include a

dimming input that permits brightness

control from a DC voltage source, a PWM

signal or an external potentiometer.

LXMG1618A modules unlike the

LXMG1617A series do not provide wide

range ‘burst’ mode dimming, rather

dimming is provided by amplitude control

of the output current waveform, and this

limits the potential dim range to typically

less than 5:1.

The module converts a DC voltage

from the system battery, or AC adapter

directly to high frequency, high-voltage

waveform required to ignite and operate

CCFL lamps. A 3.3V input inverter is

also available (LXMG1618A-03-2x).

The LXMG1618A modules contain

the newer highly integrated LX1691B

CCFL backlight controller to provide a

wider temperature range (-30°C to 80°C)

compared to the existing solutions offered

by Microsemi.

Other benefits of the inverter’s

topology include stable fixed-frequency

operation, secondary-side strike voltage

regulation and both open/shorted lamp

protection with fault timeout.

The new LXMG1618A (“A Series”)

modules are designed therefore as a

higher performance near drop-in

replacement (see BRITE minimum input)

for those customers and applications

currently using the LXMG1618 inverters.

IMPORTANT: For the most current data, consult 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 -30°C to 80°C

 UL60950 E175910

 RoHS Compliant

APPLICATIONS

 Medical Instrument Displays

 Portable Instrumentation

(GPS, etc.)

 Industrial Display Controls

BENEFITS

 Programmable Output Current

Allows Inverter to Mate with a

Wide Variety of LCD Panel’s

Specifications

 Output Open Circuit Voltage

Regulation Minimizes Corona

Discharge For High Reliability

PRODUCT HIGHLIGHT

NIVERSAL

IMMING

INPUT

"PWM", VDC, OR POTENTIOMETER

DC Voltage

Source Potentiometer PWM

Signal

SELECTABLE MAXIMUM OUPUT

CURRENT 3.5MARMS TO 5MARMS

123

PACKAGE ORDER INFO

PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO

PANEL CONNECTORS

LXMG1618A-05-21 JST SM02(8.0)B-BHS-1-TB (LF)(SN) or Yeon Ho 20015WR-05A00 or equivalent JST BHR-03VS-1

LXMG1618A-05-22 JST SM02B-BHSS-1-TB (LF)(SN) or Yeon Ho 35001WR-02A00 or equivalent JST BHSR-02VS-1

A-

-0

-2

RODUCTION

ATASHEET

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570

Page 2

Rev. 1.1,2009-11-03

WWW.Microsemi .COM

PanelMatch

™

"A Series" LXMG1618A-05-2x

5V 2.2W CCFL Programmable Inverter Module

TM ®

ABSOLUTE MAXIMUM RATINGS

Input Signal Voltage (VIN) ........................................................................................................................................-0.3V to 6V

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

Output Voltage, no load ............................................................................................................ Internally Limited to 1300VRMS

Output Current ...............................................................................................................................6mARMS (Internally Limited)

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

Input Signal Voltage ( SLEEP Input) .....................................................................................................................-0.3V to 5.5V

Input Signal Voltage (BRITE) ...............................................................................................................................-0.3V to 5.5V

Ambient Operating Temperature, zero airflow.....................................................................................................-30°C to 80°C

Storage Temperature Range...............................................................................................................................-40°C to 85°C

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, may not function optimally.

Recommended Operating Conditions

Parameter Symbol

Min R.C. Max Units

Input Supply Voltage Range (Fully Regulated

Lamp Current) 4.75 5 5.25

Input Supply Voltage Range (Functional)

VIN

4.5 5 5.5

Output Power PO 2.2 W

Linear BRITE Control Input Voltage Range¹ VBRT_ADJ 0 2.0 V

Lamp Operating Voltage VLAMP 325 380 435* VRMS

Lamp Current (Full Brightness) IOLAMP 3.5 5.0 mARMS

Operating Ambient Temperature Range TA -30 80 °C

¹ The BRITE minimum input voltage level is 0V, whereas it is 0.65V in the original LXMG1618-05-2x inverter, see application info on page 5. The minimum VBRT

ADJ voltage depends on the panel characteristics and minimum lamp current specification, depending on the panel it can vary from 0V to 0.5V

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

ELECTRICAL CHARACTERISTICS

The following specifications apply over the recommended operating condition and ambient temperature of 0°C to 60°C except where

otherwise noted.

LXMG1618A-05-2x

Parameter Symbol Test Conditions Min Typ Max

Units

` OUTPUT PIN CHARACTERISTICS

Full Bright Lamp Current IL(MAX) VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 5V

ISET1 = Ground, ISET2 = Ground 3.0 3.5 4.0 mARMS

Full Bright Lamp Current IL(MAX) VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 5V

ISET1 = Ground, ISET2 = Open 3.5 4.0 4.5 mARMS

Full Bright Lamp Current IL(MAX) VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 5V

ISET1 = Open, ISET2 = Ground 4.0 4.5 5.0 mARMS

Full Bright Lamp Current IL(MAX) VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 5V

ISET1 = Open, ISET2 = Open 4.5 5 5.5 mARMS

Min. Average Lamp Current²

IL(MIN) VBRT_ADJ = 0V, SLEEP ≥ 2.0V, VIN = 5V

ISET1 = ISET2 = Gnd 1.5 mARMS

Lamp Start Voltage VLS -30°C < TA < 80°C, VIN > 4.75V 1000 1200 VRMS

Operating Frequency fO VBRT_ADJ = 2.0V, SLEEP ≥ 2.0V, VIN = 5V 85 90 94 kHz

² The inverter is capable of a lower output current than may be recommended by the panel manufacturer. It is the user responsibility to set the minimum

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

RODUCTION

ATASHEET

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570

Page 3

Rev. 1.1,2009-11-03

WWW.Microsemi .COM

PanelMatch

™

"A Series" LXMG1618A-05-2x

5V 2.2W CCFL Programmable Inverter Module

TM ®

ELECTRICAL CHARACTERISTICS (CONTINUED)

The following specifications apply over the recommended operating condition and ambient temperature of 0°C to 60°C except where

otherwise noted.

LXMG1618A-05-2x

Parameter Symbol Test Conditions Min Typ Max

Units

` BRITE INPUT

VBRT_ADJ = 0V -9 µA

Input Current IBRT VBRT_ADJ = 3V 0 µA

Minimum Input for Max. Lamp Current VBRT_ADJ I

O(LAMP) = Maximum Lamp Current 1.8 2.0 V

Maximum Input for Min. Lamp Current³ VBRT_ADJ I

O(LAMP) = Minimum Lamp Current 0 V

Minimum PWM Input Frequency FBRT_PWM 2 kHz

` SLEEP BAR INPUT

RUN Mode SLEEP

V 2.0 V

SLEEP Mode SLEEP

V -0.3 0.8 V

` SET1,2 INPUT

SET1,2 Low Threshold V

L 0.4 V

Input Current ISET V

SET = 0V -300 µA

` POWER CHARACTERISTICS

Sleep Current IIN(MIN) VIN = 5V, SLEEP ≤ 0.8V 4 10 µA

Run Current IRUN VIN = 5V, SLEEP ≥ 2.0V, ISET1 = Open

ISET2 = Ground, VLAMP = 380VRMS 430 mA

Run Current Ripple Voltage IRIPPLE VIN = 5V, SLEEP ≥ 2.0V, ISET1 = Open

ISET2 = Ground, VLAMP = 380VRMS 300 mVpp

Efficiency η VIN = 5V, SLEEP ≥ 2.0V, ISET1 = Open

ISET2 = Ground, VLAMP = 380VRMS 80 %

³ The BRITE minimum input voltage level is 0V, whereas it is 0.65V in the original LXMG1618-05-2x inverter.

FUNCTIONAL PIN DESCRIPTION

CONN PIN DESCRIPTION

CN1 (Molex 53261-0871 or equivalent) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501G input cable

assembly

CN1-1

CN1-2 VIN Main Input Power Supply (4.75V < VIN < 5.25V)

CN1-3

CN1-4 GND Power Supply Return

CN1-5 SLEEP ON/OFF Control. (0V < SLEEP ≤ 0.8V = OFF, SLEEP ≥ 2.0V = ON)

CN1-6 BRITE Brightness Control (0V to 2.0V). 2.0V gives maximum lamp current.

CN1-7 SET1 SET1 MSB Connecting this pin to ground decreases the output current (see Table 1)

CN1-8 SET2 SET2 LSB Connecting this pin to ground decreases the output current (see Table 1)

CN2 for LXMG1618A-05-21 and -22 (JST SM02(8.0)B-BHS-1-TB(LF)(SN) |Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-

TB(LF)(SN) | Yeon Ho 35001WR-02A00) or equivalent

CN2-1 VHI High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.

DO NOT connect to Ground.

CN2-2 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length.

DO NOT connect to Ground

RODUCTION

ATASHEET

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570

Page 4

Rev. 1.1,2009-11-03

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PanelMatch

™

"A Series" LXMG1618A-05-2x

5V 2.2W CCFL Programmable Inverter Module

TM ®

TABLE 1 SETTING OUTPUT CURRENT

OUTPUT CURRENT SETTINGS

SET1

(Pin 7) SET2

(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

LXMG1618A-05-2X

0.8mm ±0.1

0.0315in.

Weight: (5.7g) typ.

4.7mm Max

0.185in.

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

GROUNDED MOUNTING

HOLE 2.44MM ±0.08 DIA.

MOUNTING HOLE

2.44MM ±0.08

DIA.

60mm ±0.2mm

2.36in.

9mm ±0.2mm

0.354 in.

R1.0

Warning

High Voltage is present at high

side of trans f or m e r, its co re

and the high sid e of the output

connector, please provide at

least 2 mm clearance (in all

directions) on the component

side of the board to any

conductor when mounting

All dimensions in millimeters, inches are for reference only.

SIMPLIFIED BLOCK DIAGRAM

Controller &

Transformer

Driver

0 to 2V

LAMP

VLO

VHI

VBRITE

SET 1

High

Voltage

Transformer

ISENSE

OVSENSE

SET 2

+3V

267k

10k

+3V

VIN

OC SENSE

10k

71.5k

220nF

RODUCTION

ATASHEET

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570

Page 5

Rev. 1.1,2009-11-03

WWW.Microsemi .COM

PanelMatch

™

"A Series" LXMG1618A-05-2x

5V 2.2W CCFL Programmable Inverter Module

TM ®

TYPICAL APPLICATION

LXMG1618A-05-2x

SET2GND

VHI

VLO

BRITE VIN

SLEEP

SET1

0V to

2.0V 500k

DAC or

Pot

CCFL

TUBE

NC NC

Figure 1 – Brightness Control

(output current set to maximum)

P.W.

10µs to 500µS

BRITE

LXMG1618A-05-2x

0 < P.W. < 100% of period

PWM Signal

from System

Figure 1A – PWM Brightness Control

LXMG1618A-05-2x

SET2GND

VHI

VLO

SLEEP

SET1

CCFL

TUBE

BRITE

VIN

L L 3.5mARMS

L H 4.0mARMS

H L 4.5mARMS

H H 5.0mARMS

L=GND; H=Open

Figure 2 – Max Output Current

(SET1 and SET2 Inputs)

• The brightness control may be a voltage output DAC or

other voltage source, a digital pot or 500K manual pot. The

inverter contains effectively an internal 338k pull-up to 3V

to bias the pot, if desired; add a resistor to set the lower

threshold voltage above the absolute minimum dim level

capability. A PWM logic level signal (figure 1A) may be

used up to 5V; however the inverter will reach maximum

current at less than 100% duty cycle. This can be

calculated as approximately 2V divided by the logic high

voltage level; with 3.3V logic level this corresponds to

about 60% duty cycle for maximum lamp current.

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

to TTL logic signal to the SLEEP input.

• Connect VHI to high voltage wire from the lamp. Connect

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

Never connect VLO to circuit ground as this will defeat

lamp current regulation. If both lamp wires have heavy

high voltage insulation, connect the longest wire to VLO.

This wire is typically white.

• Use the SET1 and SET2 (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 manufacturers. Generally the best

lamp lifetime correlates with driving the CCFL at the

manufacturer’s nominal current setting. However the

SET1 and SET2 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 an 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 of 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 user’s responsibility since

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 up to about one

second, after which (without success) the inverter will

shutdown. Supply current draw in the shutdown mode is

about 8mA. In order to restart the inverter it is necessary to

toggle the sleep input or cycle the VIN input supply.

RODUCTION

ATASHEET

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570

Page 6

Rev. 1.1,2009-11-03

WWW.Microsemi .COM

PanelMatch

™

"A Series" LXMG1618A-05-2x

5V 2.2W CCFL Programmable Inverter Module

TM ®

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 to discontinue product at any time