Datasheet LXMG1626-12-45 Datasheet (Microsemi)

PanelMatch™ StayLit™ LXMG1626-12-45

TM

The LXMG1626-12-45 is a Dual 6W
Output Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module specifically designed to be
compatible with variety of LCD panels

DESCRIPTION

lamps in the LCD fails open, the second
lamp will continue to operate with a
FAULT signal toggling to indicate the

failed condition, StayLit™ feature.
that have both lamps on one side of the
panel and use a single common lamp
return wire.

LXMG1626 modules provide the

Technique provides flicker-free brightness

control in any wide range (typically

100:1+) dimming application.
designer with a superior display brightness
range. This brightness range is achievable
with virtually any LCD display.

The modules are available with a
dimming input that permits brightness
control from either, a DC voltage source,

energizes the lamp is designed
specifically to ensure that no premature
lamp degradation occurs, while allowing
significant power savings at lower dim
levels.

a PWM signal or external potentiometer.

The maximum output current is
externally programmable (through the
input connector) at either 10mA or 12mA
(5mA or 6mA per lamp). This allows the
inverter to match the panel’s lamp current
specifications, or it can be used to

highly integrated LX1691B backlight
controller to convert DC voltage from the
system battery or AC adapter directly to
high frequency, high-voltage waves
required to ignite and operate CCFL

lamps.
purposely drive the lamps at a lower or
higher current to decrease or increase
nominal brightness. The inverter also has
a dedicated FAULT pin that indicates an
open/shorted lamp condition.

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

are stable fixed-frequency operation,

secondary-side strike-voltage regulation

and both open/shorted lamp protection

with fault timeout.

®

In addition when only one of the two

The RangeMAX™ Digital Dimming

The resultant “burst drive” that

The design utilizes Microsemi’s

Other benefits of this new topology

PRODUCT HIGHLIGHT

12V Dual 6W CCFL Programmable Inverter Module

PRODUCTION DATAS HE E T

KEY FEATURES

 Externally Programmable

Maximum Output Current

 Easy to Use Brightness Control
 RangeMAX™ Wide Range

Dimming

 Output Open & Short-Circuit

Protection and Automatic Strike­Voltage Regulation and Timeout

 StayLit™ Continued Operation

with Single Open Lamp Failure

 Fixed Frequency Operation
 Fault Output Signal
 Rated From -30°C to 80°C
 RoHS Compliant
 UL60950 E175910



APPLICATIONS

 Dual Lamp LCD’s Requiring a

Shared Common Lamp Return

 Mates to a Single JST BHR-04

VS-1 Lamp Connector

 Industrial Display Controls

BENEFITS

 Smooth, Flicker Free 1% - 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

WWW.Microsemi .COM

DC Voltage

Source

Potentiometer

Microsemi

UNIVERSAL DIMMING INPUT

Lamp
Fault
Signal

OUTPUT

PART NUMBER OUTPUT CONNECTOR

LXMG1626-12-45 JST SM04(4.0)B-BHS-1-TB(LF)(SN), Yeon Ho 20015WR-07A00 or equivalent JST BHR-04VS-1

Copyright © 2007
Rev.1.1, 2007-08-24

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

"PWM", VDC, OR POTENTIOMETER

Lamp current 5 or 6mA per Lamp

PACKAGE ORDER INFO

Microsemi

Analog Mixed Signal Group

PWM

Signal

INPUT

4

123

W

HI

HI

I

NVERTER MATES DIRECTLY

TO

PANEL CONNECTORS

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PanelMatch™ StayLit™ LXMG1626-12-45

TM

®

12V Dual 6W CCFL Programmable Inverter Module

PRODUCTION DATAS HE E T

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

Input Power......................................................................................................................................................................... 8W

Output Voltage, no load ............................................................................................................ Internally Limited to 1500V

Output Current (per lamp) ...........................................................................................................6.6mA

Output Power ..................................................................................................................................................................... 6W

Input Signal Voltage (

SLEEP

Input)..................................................................................................................-0.3V to 13.2V

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, will not function optimally.

Parameter Symbol

Input Supply Voltage Range (Fully Regulated Lamp
Current)

Input Supply Voltage Range (Functional)
Output Power P
Linear BRITE Control Input Voltage Range V
Lamp Operating Voltage V
Lamp Current (Full Brightness, per Lamp) I
Operating Ambient Temperature Range T

¹ Based on single lamp voltage measurement, use of lamps outside of this range may result is false triggering of the fault detection circuitry.

²At input voltages below 12V the inverter may not be able to output the full 6mA

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.

Parameter Symbol Test Conditions

OUTPUT PIN CHARACTERISTICS

`

Full Bright Lamp Current (two lamps) I

Full Bright Lamp Current (two lamps) I

Output Current Lamp to Lamp
Deviation

Min. Average Lamp Current I

Lamp Start Voltage VLS VIN > 10.8V 1250 1400 V

Operating Frequency fO

Burst Frequency f

FAULT Output Voltage High FAULTVH FAULT = -10uA 3 3.5 V

FAULT Output Voltage Low FAULTVL FAULT = 10uA 0.3 0.8 V

ABSOLUTE MAXIMUM RATINGS

(Internally Limited)

RMS

Recommended Operating Conditions

Min R.C. Max

V

IN

4.5 5.5 W

O

0 2.0 V

BRT_ADJ

385 435 485 V

LAMP

5.0 6.0 mA

O(LAMP)

-30 80 °C

A

RMS

10.8 12 13.2

10.2 12 13.6

per lamp in all configurations.

ELECTRICAL CHARACTERISTICS

LXMG1626-12-45

Min Typ Max

L(MAX)

L(MAX)

I

LL%DEV

L(MIN)

BURST

I

= Ground

SET

> 2.0V,

V

BRT_ADJ

I

= Open

SET

> 2.0V,

V

BRT_ADJ

I

= Open

SET

= 0V,

V

BRT_ADJ

I

= Ground; I

SET

V

BRT_ADJ

Output Burst Frequency 215 225 235 Hz

SLEEP

= 2.0V,

> 2.0V,

V

BRT_ADJ

SLEEP

SLEEP

SLEEP

OUT

SLEEP

> 2.0V, V

> 2.0V, V

> 2.0V, V

> 2.0V, V

= I

* SQRT of % duty cycle

MAX

> 2.0V, V

IN

IN

IN

IN

= 12V

IN

= 12V

= 12V

= 12V

= 12V

9 10 11 mA

11 12 13 mA

5 %

1.6 mA

55.2 57.6 60 kHz

Units

V

RMS

RMS

RMS

¹

²

Units

RMS

RMS

RMS

RMS

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Copyright © 2007
Rev.1.1, 2007-08-24

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Page 2

PanelMatch™ StayLit™ LXMG1626-12-45

TM

®

12V Dual 6W CCFL Programmable Inverter Module

PRODUCTION DATAS HE E T

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.

Parameter Symbol Test Conditions

BRITE INPUT

`

Input Current I

Minimum Input for Max. Lamp Current V

Maximum Input for Min. Lamp Current V

SLEEP BAR INPUT

`

RUN Mode

SLEEP Mode

SET INPUT

`

SET Low Threshold

Input Current I

POWER CHARACTERISTICS

`

Sleep Current I

Run Current I

Efficiency

ELECTRICAL CHARACTERISTICS (CONTINUED)

V

= 0V -13 µA

BRT_ADJ

BRT

I

BRT_ADJ

I

BRT_ADJ

V

SLEEP

V

SLEEP

V

0.4 V

L

V

SET

V

IN(MIN)

IN(RUN)

η

= 3V 1 µA

V

BRT_ADJ

= Maximum Lamp Current 2.0 2.05 V

O(LAMP)

= Minimum Lamp Current 0 V

O(LAMP)

2.1 V

-0.3 0.8 V

≤ 0.4V -500 µA

SET

V
V
V
V

= 12V,

IN

= 12V,

IN

LAMP

= 12V,

IN

LAMP

= 435V

= 435V

< 0.8V 0.0 12 50 µA

SLEEP

SLEEP

RMS

SLEEP

RMS

≥ 2.0V, I

≥ 2.0V, I

= Ground

SET

= Ground

SET

LXMG1626-12-45

Min Typ Max

440 mA

83 %

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

CN1-3

CN1-4

CN1-5

Main Input Power Supply (10.8V < VIN < 13.2V)

V

IN

GND Power Supply Return

SLEEP

ON/OFF Control. (0V <

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

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

CN1-8 FAULT High Impedance Output that indicates lamp status, high indicates fault (see figure 2 on page 5)

CN2 for LXMG1626-12-45 (JST SM03(4.0)B-BHS-1-TB(LF)(SN), Yeon Ho 20015WR-07A00 ) or equivalent)

CN2-1

CN2-2

CN2-3

CN2-4

V

V

NC

V

HI1

HI2

LO

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

DO NOT connect to ground.

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

DO NOT connect to ground.

No Connect

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

DO NOT connect to ground

FUNCTIONAL PIN DESCRIPTION

SLEEP

< 0.8V = OFF,

SLEEP

>= 2.1V = ON

Units

V

IN

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Copyright © 2007
Rev.1.1, 2007-08-24

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Page 3

PanelMatch™ StayLit™ LXMG1626-12-45

TM

®

12V Dual 6W CCFL Programmable Inverter Module

PRODUCTION DATAS HE E T

Open* 12mA
Ground 10mA

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

4.0mm

0.157in.

6.5mm

0.265in.
Max

All dimensions are in millimeters, inches are for reference only

SET1

(Pin 7)

UNPLATED MOUNTING HOLE 3MM ± 0.1 DIA.

MM HEAD CLEARANCE BOTH HOLES

113mm

4.45in.

CN1

W

22mm

± 0.2

0.866in.

16mm

0.630in.

Outside PCB tolerances ± 0.5mm , 4-40 recommended mounting screws

GROUNDED MOUNTING

OLE 3MM ± 0.1 DIA.

H

6

OUTPUT CURRENT SETTINGS

PHYSICAL DIMENSIONS

83mm ± 0.2

3.27in.

SIMPLIFIED BLOCK DIAGRAM

TABLE 1

Nominal Output Current

LXMG1626-12-45

CN2

weight: 15g

30mm

1.181in.

W

1.0mm

0.0394in.

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Warning
High Voltage is present at
high side of transformers,

their cores and the high side

of the output connector,

when mounting please

provide at least 2 mm

clearance (in all directions)

on the component side of

the board to any conductor

Copyright © 2007
Rev.1.1, 2007-08-24

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Page 4

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PanelMatch™ StayLit™ LXMG1626-12-45

TM

DAC or
Pot

500K

BRITE

SET
NC

LXMG1626-12-45

SLEEP

FAULT

`

NC

12V

V

IN

TYPICAL APPLICATION

V

HI1

V

HI2

V

LO

GND

Figure 1 – Brightness Control

(Output current set to maximum)

PWM Signal

from System

P.W

10

P.W . < 100 % of period

0 <

200 µS

to

µs

.

BRITE

LXMG1626-12-45

Figure 1A – PWM Brightness Control

12V

GND

V
V

V

BRITE

LXMG1626-12-45

SLEEP

SET

FAULT

V

IN

HI1

HI2

LO

Lamp(s) Status FAULT Inverter Operation

Normal Operation Low Normal full lamp current

One Lamp Open High Normal @ ~½ lamp current*

Both Lamps Open High Shutdown

One Lamp High

Side Short to

Ground

Both Lamps High

Side Short to

Ground

High Normal @ ~½ lamp current*

High Shutdown

Figure 2 – FAULT Output Operation

* Under some conditions the second lamp will also shutdown, this is especially

true if the inverter draws an arc going open or when shorted.

®

12V Dual 6W CCFL Programmable Inverter Module

PRODUCTION DATAS HE E T

WWW.Microsemi .COM

 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 215k pull-up to 3V to bias the
pot. A 3.3V Logic Level PWM signal from a micro­controller 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

 Connect V

lamps. Connect V

HI1

and V

HI2

to the low voltage wire lamp return

LO

(wire with thinner insulation). Never connect V
ground as this will defeat lamp current regulation.

 Use the SET input to program the desired maximum output

current. Generally the best lamp lifetime correlates with
driving the CCFL at the manufacture’s nominal current
setting.

 Typically the SET pin is permanently wired to ground or

intentionally left open. However it can also be actively
driven, using an open collector, or open drain logic signal.
This will allow dynamic adjustment of 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 dimming ratio is a
factor of both the burst duty cycle and the peak output
current, by using this technique the effective dim ratio can
be increased greater than what the burst duty cycle alone
could provide. Conversely, the SET input could be used to
overdrive the lamp current. Of course, any possible
degradation of lamp life from such practices is the user’s
responsibility since not all lamps are designed to be under
or overdriven.

 Input connector (CN1-8) FAULT signal which is normally

low will toggle high to indicate that an output fault
condition has occurred as summarized in the table to the left
figure 2. FAULT will toggle high if one or both lamps are
open or short circuited. If only one lamp opens, or its high
side is shorted to ground then the other lamp should
continue to operate with the FAULT signal going high. If
both lamps open and/or both lamps are shorted the FAULT
will toggle high if it is not already high and the inverter
output will shutdown. Also if either low side connection of
the lamps is shorted to ground, or the lamps are shorted
high side to low side, FAULT will go high and the inverter
will shutdown. In order to restart the inverter after a fault, it
is necessary to toggle the
input supply. In fault induced shutdown mode the inverter
will draw about 15mA from V

input.

SLEEP

to high voltage wires from the

to circuit

LO

input or cycle the VIN

SLEEP

supply.

IN

A

A

P

P

P

P

L

L

I

I

C

C

A

A

T

T

I

I

O

O

N

N

Copyright © 2007
Rev.1.1, 2007-08-24

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Page 5

PanelMatch™ StayLit™ LXMG1626-12-45

TM

®

NOTES

12V Dual 6W CCFL Programmable Inverter Module

PRODUCTION DATAS HE E T

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.

N

N

O

O

T

T

E

E

S

S

WWW.Microsemi .COM

Copyright © 2007
Rev.1.1, 2007-08-24

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Page 6