LXMG1612-05-03 - Microsemi - Product.Network

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LXMG1612-05-xx

5V Highly-Integrated, Digital Dimming CCFL Inverter Module

TM ®

DESCRIPTION

RangeMAX Wide Range Dimming,

Single Output Inverter. The

LXMG1612-05-xx series of Direct

Drive™ CCFL (Cold Cathode

Fluorescent Lamp) Inverter Modules are

specifically designed for driving LCD

backlight lamps.

RangeMAX Digital Dimming

Technique. Digital Dimming provides

flicker-free brightness control in any

wide-range dimming application.

The modules are equipped with a

dimming input that permits brightness

control from an external potentiometer,

DC voltage source, or PWM signal. The

resultant “burst drive” that energizes the

lamp was designed specifically to ensure

that no premature lamp degradation

occurs.

Input Voltage Range: 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

12V input inverter is also available

(LXMG1612-12-xx)

Direct Drive Technology: The module

design is based on a new Direct Drive

topology, which provides a number of

cost and performance ad-vantages.

Additional Feature: Other benefits of

this new topology are fixed-frequency

operation and secondary-side strike-

voltage regulation and all LXMG1612-

05-xx modules feature both open and

shorted lamp protection.

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; Patents Pending

KEY FEATURES

 RangeMAX Wide Range

Dimming

 Single 5V Input Voltage

 Fully Integrated Direct Drive

And Dimming Control

 Single Sided PCB Layout

 Easy To Use Brightness

Control

 MicroAmp

SLEEP Mode

 Output Short-Circuit

Protection And Automatic

Strike-Voltage Regulati on

 Fixed Frequency Operation

 UL 60950 E175910

 RoHS Compliant

APPLICATIONS

 Notebook And Sub-Noteb ook

Computers

 Portable Instrumentation

 Desktop Displays

 Low Ambient Light

Conditions (i.e. Aircraft

Cabins, Automobile)

BENEFITS

 Smooth, Flicker Free 1-100%

Full-Range Brightness

Control Gives Your Product

A High Quality Image

 Output Open Circuit Voltage

Regulation Minimizes Corona

Discharge For Long Life And

High Reliability

 Power Efficient. “Low

Brightness” Capability Allows

For Advanced Power

Management

PRODUCT HIGHLIGHT

123

DC Voltage

Source Potentiometer PWM

Signal

UNIVERSAL D IMMING INPUT

"PWM", VDC,OR POTENTIOMETER

BRITE

Microsemi

PACKAGE ORDER INFO

PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO

PANEL CONNECTORS

LXMG1612-05-01 JST SM02(8.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-05A00 BHR-03VS-1

LXMG1612-05-02 JST SM02B-BHSS-1-TB(LF)(SN) or Yeon Ho 35001WR-02A00 BHSR-02VS-1

LXMG1612-05 -03 Honda QZ-19-A3MYL #02 Honda QZ-19-3F01

-0

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LXMG1612-05-xx

5V Highly-Integrated, Digital Dimming CCFL Inverter Module

TM ®

ABSOLUTE MAXIMUM RATINGS (NOTE 1)

Input Signal Voltage (VIN1)................................................................................................................................-0.3V to 6.5V

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

Output Current ........................................................................................................................8.0mARMS (Internally Limited)

Output Power .................................................................................................................................................................. 6.0W

Input Signal Voltage (BRITE Input).........................................................................................................-0.3V to VIN1+0.3V

Input Signal Voltage (SLEEP, VSYNC Inputs)............................................................................................-0.3V to VIN1+0.3V

Ambient Operating Temperature, zero airflow.....................................................................................................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

specified terminal.

FUNCTIONAL PIN DESCRIPTION

CONN PIN DESCRIPTION

CN1 (Molex 53261-0871) Mates with 51021-0800 housing, 50079-8100 pins

CN1-1

CN1-2 VIN1 Main Input Power Supply (4.5V < VIN1 < 5.5V

CN1-3

CN1-4 GND Power Supply Return

CN1-5 SLEEP ON/OFF Control. (2.1V < SLEE

< VIN1 = ON, 0V < SLEE

< 0.8V = OFF, SLEE

Floating = OFF)

CN1-6 BRITE Brightness Control (0.0V to 2.5VDC). 2.5VDC gives maximum lamp current.

CN1-7 BRITE RTN Analog Ground. Use f or BRITE signal return ONLY.

CN1-8 VSYNC Vertical Synchronization Input. 2.5 to 5.0V Logic Level. (20Hz < fSYNC < 200Hz)

CN2 for LXMG1612-05-01 and -02 (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)

CN2-1 VHI High voltage conn ection to high side of lamp. Connect to lamp terminal with short est 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

CN2 for LXMG1612-05-03 (Honda QZ-19-A3MYL#02)

CN2-3 VHI High voltage conn ection to high side of lamp. Connect to lamp terminal with short est lead length.

DO NOT connect to Ground.

CN2-1 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length.

DO NOT connect to Ground

PHYSICAL DIMENSIONS

LXMG1612-05-XX

4.96in.

126mm

0.06in.

1.52mm

CN1

CN2

0.13in.

3.3mm

0.66in.

16.75mm

Weight: 12.5 (g) typ.

0.63in.

16mm

3.64in.

92.5mm

0.5in.

12.7mm

0.315in.

8.0mm

Warning

High Voltage Present at all

Output Connectors

GROUNDED MOUNTING HOLE

3.0mmDIA. ± .08DIA

MOUNTING HOLE

3.0mmDIA. ± .08DIA

PCB tolerances ± 0.5mm

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LXMG1612-05-xx

5V Highly-Integrated, Digital Dimming CCFL Inverter Module

TM ®

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 V oltage Range (Full y Regulated

Lamp Current) 4.5 5 5.5

Input Supply Voltage Range (Functional) VIN1 4.35 5 5.65 V

Output Power PO 3.5 4.0 W

Brightness Control Input Voltage Range VBRT_ADJ 0.0 2.5 VIN V

Lamp Operating Voltage VLAMP 450 535 620 VRMS

Lamp Current (Full Brig htness) IOLAMP 5.8 mARMS

Operating Ambient Temperature Range TA 0 70 °C

ELECTRICAL CHARACTERISTICS

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

25°C except where otherwise noted.

LXMG1612-05-xx

Parameter Symbol Test Conditions Min Typ Max

Units

` OUTPUT PIN CHARACTERISTICS

Full Brig ht La mp C ur rent IL(MAX) VBRT_ADJ=2.5VDC, SLEEP=HIGH,

Burst Duty=100%, VIN1=5VDC 5.2 5.8 6.4 mARMS

Min. Average Lamp Current

(Note 2) IL(MIN) VBRT_ADJ=0VDC, SLEE

=HIGH, Burst Duty=2.0%,

VIN1=5VDC 0.12 mARMS

Lamp Start Voltage VLS 0°C <TA < 70°C, VIN1 > 5.0VDC 1500 1650 1800 VRMS

Operating Frequency fO VBRT_ADJ=2.5VDC, SLEEP=HIGH, VIN1=5.0V 63 68 73 kHz

` BRITE INPUT

VBRT_ADJ=0VDC -685 -728 -775 µADC

Input Current IBRT VBRT_ADJ=2.5VDC -260 -282 -305 µADC

Input Voltage for Max. Lamp Current VBRT_ADJ I

O(LAMP)=100% Duty Cycle 2.30 2.35 2.40 VDC

Input Voltage for Min. Lamp Current VBRT_ADJ I

O(LAMP)= Minimum Duty Cycle 0.0 VDC

` SLEE

INPUT

RUN Mode V(HI)SLEEP VIN1=4.5V 1.9 2.1 VIN1 V

SLEE

Mode V(LO)SLEEP VIN1=5.5V -5.0 1.9 2.0 VDC

SLEEP=5.0V 390 410 435 µADC

Input Current ISLEEP SLEEP=0V 0.0 0.0 0.0 µADC

` VSYNC CHARACTERISTICS

VSYNCH(HI) V

IN1=4.5V 1.50 2.5 5.0 VDC

Logic High Level VSYNCH(LO) V

IN1=5.5V -3.0 0.0 1.2 VDC

Input Impedance ZIN 25 27 29 KΩ

Input Frequency fSYNC 20 200 Hz

` POWER CHARACTERISTICS

Sleep Current IIN(MIN) VIN1=5VDC, SLEEP=0.0V 0.0 0.5 10 µADC

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

Average RMS current = (Burst Duty Cycle) x (Burst amplitude of 5.8mARMS)

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LXMG1612-05-xx

5V Highly-Integrated, Digital Dimming CCFL Inverter Module

TM ®

HOW RANGEMAX WORKS

LAMP VOLTAGE & LAMP CURRENT – Burst Mode Operation

Figure 1 – 50% Burst Duty Cycle Figure 2 – 2% Burst Duty Cycle

Rather than using the traditional dimming technique of varying

lamp current magnitude to adjust light output, RangeMAX

inverters use a fixed lamp current value with a duty cycle control

method.

The lamp current burst width can be modulated from 100%

(continuous lamp current) down to a 2% duty cycle, allowing the

lamp to be di mm ed to less than 1% of its full brightness.

As can be seen in Trace 4 of Figure 3 photo at right, careful

design consideration was given to controlling lamp start voltage

to softly start current flow. This eliminates current overshoot that

can result in premature cathode wear and reduce lamp life.

Figure 3 – 2% Burst Duty Cycle (Expanded Time Base)

Ramp Gen

Transformer

Driver

0.25 -

2.5VDC

LAMP

VLO

VHI

Comparator

Ramp

VBRITE

VSYNC

High Voltage

Transformer

ISENSE

VSENSE

Figure 4 – RangeMAX Block Diagram

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LXMG1612-05-xx

5V Highly-Integrated, Digital Dimming CCFL Inverter Module

TM ®

HOW RANGEMAX WORKS (CONTINUED)

Highlights

 Integrated brightness control circuit includes a DC voltage

to pulse width converter that minimizes system design

work and system noise susceptibility. This provides a

familiar and convenient interface while reducing the

potential for externally induced noise, which can cause

lamp flicker.

 RangeMAX inverter modules are designed to operate with

the burst frequency synchronized to the video frame rate.

This provides operation with no visible display

disturbances caused by beat frequencies between the lamps

and video frame rates. In this synchronous mode, the

inverter burst rate operates at twice the video refresh rate,

well beyond standard 50/60Hz video refresh rates where

the eye can perceive pulsing light.

 In applications with no access to a vertical sync., an onboard

oscillator operates the inverter burst rate at about 250Hz. In

this non-synchronous mode, minor display disturbances can

be found under certain video conditions. This performance

may be acceptable for many applications, but

synchronization must be used when no disturbance can be

tolerated.

 A single input will accommodate negative and positive

vertical sync pulses at any pulse width.

 Separate feedback loops for lamp current and open circuit

voltage regulation insure reliable strike under all operating

conditions, automatic over-voltage prevention with broken

or failed lamps, and accurate lamp current regulation.

TYPICAL APPLICATION

LXMG1612-05-xx

VSYNC

VSYNC GND

VHI

VLO

BRITE

Figure 5 - Potentiometer Brightness Control

VIN1

CCFL

TUBE

BRITE RTN

10k

SLEEP

0V 5V

DAC or

Pot

P.W.

2ms

BRITE

LXMG1612-05-xx

0 < P.W. < 100% of period

PWM Signal

from System

Figure 5A - PWM Brightness Control

 The brightness control may be a voltage output DAC, digital

resistor or a simple 10k potentiometer. If desired, an

additional series resistor with the 10k potentiometer can be

used to set a higher minimum brightness setting as shown in

Figure 5. A 2.5V to 5V Logic Level PWM signal from a

micro-controller ma y also be used as shown in Figure 5A.

 If synchronization to the video frame rate is desired, connect

the vertical sync pulse from the system video controller to

the VSYNC input. If no video synchronization is desired,

connect VSYNC to ground.

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

to 2.5V to 5V logic signal to the SLEE

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.

LXMG1612-05-XX OUTPUT CURRENT ADJUST

The LXMG1612-05 output current can be adjusted by changing the

value of two resistors on the PCB. The following table shows the

approximate new output current values:

Output Current R12 R16

7.0mA 2.00K 1% Not Used

6.0mA 2.61K 1% Not Used

5.8mA 2.74K 1% Not Used

5.0mA 2.74K 1% 499K 1%

4.0mA 2.74K 1% 178K 1%

3.0mA 2.74K 1% 78.7K 1%

C9 R7

C11 R14

R15

C15

C12

R11

C14

C13

R10

C16

C10

R13

C17

R3R4

C6 C8

R17

R37

R36

R35

C21

R38

R39

R32

R31

R40

R41

R20

R21

R34R33R30

D2 D1

R16

R12

Figure 6- Component Replacement Locations

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LXMG1612-05-xx

5V Highly-Integrated, Digital Dimming 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.