LXMG1627-12-42 - Microsemi Corporation

RODUCT

ATASHEET

Microsemi

Analog Mixed Signal Group

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

Page 1

Rev. 1.0, 2009-06-22

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PanelMatch™ LXMG1627-12-4x

12V Dual 4W Programmable CCFL Inverter Module

TM ®

DESCRIPTION

The LXMG1627-12-4x is a Dual 4W

Output Direct Drive™ CCFL (Cold

Cathode Fluorescent Lamp) Inverter

Module specifically designed for driving

LCD backlight lamps. It is ideal for

driving typical 6.4” to 10.4” TFT panels.

LXMG1627 modules provide the

designer with a vastly superior display

brightness range. This brightness range is

achievable wit h vi rt uall y any LC D di spl ay .

The modules are available with a

dimming input that permits brightness

control from either a DC voltage source or

a PWM signal or external potentiometer.

The maximum output current is externally

programmable over a range of 5mA to

6.5mA in 0.5mA steps to allow the

inverter to properly match to a wide array

of LCD panel lamp current specifications.

RangeMAX™ Digital Dimming

Technique provides flicker-free brightness

control in any wide range typically (50:1+)

dimming application.

The resultant “burst drive” that

energizes the lamp was designed

specifically to ensure that no premature

lamp degradation occurs, while allowing

significant power savings at lower dim

levels.

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 (LXMG1627-05-4x), as well as

6W versions (LXMG1627-xx-6x) for

driving large higher voltage/power

panels.

The module’s design is based on

Microsemi’s LX6512 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 short protection with

fault timeout.

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

 RangeMAX™ Wide Range

Dimming

 Output Open/Short-Circuit

Protection and Automatic Strike-

Voltage Regulation and Timeout

 Fixed Frequency Operation

 Rated From -30°C to 80°C

 UL60950 E175910 Pending

 RoHS Compliant

APPLICATIONS

 High Brightness Displays

 Portable Instrumentation

 Desktop Displays

 Industrial Display Controls

BENEFITS

 Smooth, Flicker Free 2%-

100% Full-Range Brightness

Control

 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

SELECTABLE MAXIMUM

OUTPUT CURRENT

5.0mARMS TO 6.5mARMS

UNIVERSAL DIMMING

INPUT

“PWM”, VDC, or

POTENTIOMETER

DC Voltage

Source Potentiometer PWM

Signal

CN1

123

CN3

123

CN2

PACKAGE ORDER INFO

PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO

PANEL CONNECTORS

LXMG1627-12-41 JST SM02(8.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-05A00 JST BHR-03VS-1

LXMG1627-12-42 JST SM02B-BHSS-1-TB(LF)(SN) or Yeon Ho 35001WR-02A00 JST BHSR-02VS-1

-1

-4

RODUCT

ATASHEET

Microsemi

Analog Mixed Signal Group

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

Page 2

Rev. 1.0, 2009-06-22

WWW.Microsemi .COM

PanelMatch™ LXMG1627-12-4x

12V Dual 4W Programmable CCFL Inverter Module

TM ®

ABSOLUTE MAXIMUM RATINGS

Input Signal Voltage (VIN) ......................................................................................................................................-0.3V to 15V

Input Power ....................................................................................................................................................................... 10W

Output Voltage, no load ............................................................................................................ Internally Limited to 1400VRMS

Output Current ............................................................................................................................7.5mARMS (Internally Limited)

Output Power (each output) ................................................................................................................................................ 4W

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

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

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

Operating Relative Humidity, non-condensing ................................................................................................................ ≤90%

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) 10.8 12 13.2

Input Supply Voltage Range (Functional)

VIN

10.2 12 13.8

Output Power (each output) PO 3.5 4.0 W

Linear BRITE Control Input Voltage Range VBRT_ADJ 0.0 2.5 V

Lamp Operating Voltage VLAMP 350 440 530 VRMS

Lamp Current (Full Brightness) IOLAMP 5 6.5 mARMS

Operating Ambient Temperature Range TA -30 80 °C

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 0°C to

60°C except where otherwise noted; BRITE ≥ 2.5V, SLEEP ≥ 2.1V, VIN =12V. LXMG1627-12-4x

Parameter Symbol Test Conditions Min Typ Max

Units

` OUTPUT PIN CHARACTERISTICS

Full Bright Lamp Current (each output) IL(MAX) SET1 = Ground, SET2 = Ground 4.5 5.0 5.5 mARMS

Full Bright Lamp Current (each output) IL(MAX) SET1 = Ground, SET2 = Open 5.0 5.5 6.0 mARMS

Full Bright Lamp Current (each output) IL(MAX) SET1 = Open, SET2 = Ground 5.5 6.0 6.5 mARMS

Full Bright Lamp Current (each output) IL(MAX) SET1 = Open, SET2 = Open 6.0 6.5 7.0 mARMS

Output Current Lamp to Lamp

Deviation ILL%DEV SET1 = Open, SET2 = Open 5 10 %

Min. Average Lamp Current

(each output) IL(MIN) BRITE = 0V SET1 = SET2 = Ground

IL(MIN) = ILMAX * CycleDuty Burst 1.0 mARMS

Lamp Start Voltage VLS -30°C < TA < 80°C, VIN > 10.8V 1250 1400 VRMS

Operating Frequency fO 48 54 60 kHz

Burst Frequency fBURST Output Burst Frequency 140 165 198 Hz

RODUCT

ATASHEET

Microsemi

Analog Mixed Signal Group

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

Page 3

Rev. 1.0, 2009-06-22

WWW.Microsemi .COM

PanelMatch™ LXMG1627-12-4x

12V Dual 4W Programmable CCFL Inverter Module

TM ®

ELECTRICAL CHARACTERISTICS (CONTINUED)

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

0°C to 60°C except where otherwise noted; BRITE ≥ 2.5V, SLEEP ≥ 2.1V, VIN = 12V

LXMG1627-12-4x

Parameter Symbol Test Conditions Min Typ Max

Units

` BRITE INPUT

BRITE = 0V -14 µA

Input Current IBRT

BRITE = 3V -4 µA

Minimum Input for Max. Lamp Current VBRT_ADJ I

O(LAMP) = Maximum Lamp Current 2.1 2.3 2.5 V

Maximum Input for Min. Lamp Current VBRT_ADJ I

O(LAMP) = Minimum Lamp Current 0 V

BRITE PWM Input Frequency Range FBRT_PWM %

BRT_PWM < 50% (Visual Artifact Avoidance) 2 100 kHz

` SLEEP INPUT

RUN Mode SLEEP

V 2 VIN V

SLEEP Mode SLEEP

V 0 0.8 V

` SET1,2 INPUT

SET1,2 Low Threshold V

L 0 0.4 V

Input Current ISET SETx = 0V -84 µA

` POWER CHARACTERISTICS

Sleep Current IIN(MIN) SLEEP < 0.8V 2 20 µA

Run Current IIN(RUN) SET1 = Open, SET2 = Ground, VLAMP = 440VRMS 520 mA

Strike (Open Lamps) TS_DWELL 1.0 1.5 Sec

Supply Current After Fault Timeout IFAULT Fault Timeout 7 mA

Efficiency η SET1 = Open, SET2 = Ground, VLAMP = 440VRMS 85 %

FUNCTIONAL PIN DESCRIPTION

CONN PIN DESCRIPTION

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

CN1-1

CN1-2 VIN Main Input Power Supply (10.8V < VIN < 13.2V), Functional 10.2V to 13.8V

CN1-3

CN1-4 GND Power Supply Return

CN1-5 SLEEP ON/OFF Control. (0V ≤ SLEEP ≤ 0.8 = OFF, SLEEP ≥ 2.1V = ON

CN1-6 BRITE Brightness Control (0V to 2.5V). 2.3V gives maximum lamp current; 500k manual pot; PWM signal.

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, CN3 for LXMG1627-12-41 and -42

(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

CN3-1 VHI High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.

DO NOT connect to Ground.

CN2-2

CN3-2 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length.

DO NOT connect to Ground

RODUCT

ATASHEET

Microsemi

Analog Mixed Signal Group

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

Page 4

Rev. 1.0, 2009-06-22

WWW.Microsemi .COM

PanelMatch™ LXMG1627-12-4x

12V Dual 4W Programmable CCFL Inverter Module

TM ®

TABLE 1

OUTPUT CURRENT SETTINGS

SET1

(Pin 7) SET2

(Pin 8) Nominal Output Current

Open* Open* 6.5mA

Open* Ground 6.0mA

Ground Open* 5.5mA

Ground Ground 5.0mA

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

PHYSICAL DIMENSIONS

LXMG1627-12-4X

CN1

11mm

0.433 in

4mm

0.157 in

114mm

4.488 in.

CN3

125mm

4.921 in.

CN1

1mm ± 0.1

0.0395 in.

6mm Max

0.236in. weight: 18g typ.

30mm

1.181in

PCB tolerances ± 0.5mm , 3mm recommended mounting screws

GROUNDED MOUNTING HOLE 3.18MM ±.08 DIA.

6MM HEAD CLEARANCE BOTH HOLES

MOUNTING HOLE 3.18MM ±.08 DIA.

103mm ±0.2

4.055 in.

Warning

High Voltage is present at

high side of each transformer,

its core and the high side of

the output connec tor pins,

please provide at least 3 mm

clearance (in all directions) on

the component side of the

board to any conductor when

mounting

CN2

CN3

CN2

22mm ± 0.2mm

0.866in

Dimensions are in millimeters (inches for reference only)

SIMPLIFIED BLOCK DIAGRAM

Ramp

Gen

Transformer

Driver

LAMP

VLO

VHI

Comparator

Ramp

BRITE

SET1

High Voltage

Transformer

ISENSE

OVSENSE

SET2

249k

47k

+4.2V

VIN

47k

Controller

One of two

+4.2V

49.9k

RODUCT

ATASHEET

Microsemi

Analog Mixed Signal Group

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

Page 5

Rev. 1.0, 2009-06-22

WWW.Microsemi .COM

PanelMatch™ LXMG1627-12-4x

12V Dual 4W Programmable CCFL Inverter Module

TM ®

TYPICAL APPLICATION

LXMG1627-12-4x

12V

SET2GND

VHI

VLO

BRITE

VIN

SLEEP

SET1

0V to

2.5V 500k CCFL

TUBE

NC NC

ONE OF

TWO

Voltage Source,

DAC, or

Potentiometer

Figure 1 – Brightness Control

(Output current set to maximum)

P.W.

10µs to 500µS

BRITE

LXMG1627-12-4x

0 < P.W. < 100% of period

PWM Signal

from System

Figure 1A – PWM Brightness Control

LXMG1627-12-4x

SET2GND

VHI

VLO

SLEEP

SET1

CCFL

TUBE

BRITE

12V

VIN

ONE OF

TWO

L L 5.0mARMS

L H 5.5mARMS

H L 6.0mARMS

H H 6.5mARMS

L=GND; H=Open

Figure 2 – Maximum 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 an internal 300k pull-up to typically 4.2V

to bias the pot. 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 2.3V divided by the logic

high voltage level; with 3.3V logic level this corresponds

to about 70% 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 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.

Since the dim ratio is a factor of both the burst duty cycle

and the peak output current, using this technique the

effective dim ratio can be increased greater than the burst

duty cycle alone. 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 since not all lamps are designed to be

overdriven.

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

or both outputs are open (lamp disconnected or broken) the

inverter will attempt to strike for about a 1.5 seconds and

then shutdown for safety purposes. In order to restart the

inverter it is necessary to toggle the sleep input or cycle the

VIN input supply.

RODUCT

ATASHEET

Microsemi

Analog Mixed Signal Group

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

Page 6

Rev. 1.0, 2009-06-22

WWW.Microsemi .COM

PanelMatch™ LXMG1627-12-4x

12V Dual 4W Programmable CCFL 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.