Microsemi LXMG1626-05-45 Technical data

PanelMatch™ StayLit™ LXMG1626-05-45

TM

The LXMG1626-05-45 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

In addition when only one of the two
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 vastly 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.

®

RangeMAX Digital Dimming

The resultant “burst drive” that

The design utilizes Microsemi’s

Other benefits of this new topology

PRODUCT HIGHLIGHT

5V 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

LXMG1626-05-45 JST SM04(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00 JST BHR-04VS-1

Copyright © 2005
Rev. 1.0, 2007-01-24

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

Integrated Products

PWM

Signal

INPUT

4

123

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HI

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TO

PANEL CONNECTORS

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PanelMatch™ StayLit™ LXMG1626-05-45

TM

®

5V Dual 6W CCFL Programmable Inverter Module

PRODUCTION DATAS HE E T

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

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 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

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.

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 PO 4.5 5.5 W
Linear BRITE Control Input Voltage Range V
Lamp Operating Voltage V
Lamp Current (Full Brightness, per Lamp) I
Operating Ambient Temperature Range TA -20 70 °C

¹ Based on single lamp voltage measurement.
²At input voltages below 5V the inverter may not be able to output the full 6mA

Unless otherwise specified, the following specifications apply over the recommended oper ating 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 > 4.5VDC 1250 1400 V

Operating Frequency fO

Burst Frequency f

FAULT Output Voltage High FAULTVH FAULT = -10uA 2.9 3.1 V

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

ABSOLUTE MAXIMUM RATINGS (NOTE 1)

(Internally Limited)

RMS

Input)....................................................................................................................-0.3V to 5.5V

RECOMMENDED OPERATING CONDITIONS (R.C.)

Recommended Operating Conditions

Min R.C. Max

VIN

4.75 5 5.25

4.5 5 5.5

0 2.0 V

BRT_ADJ

385 435 485 V

LAMP

5.0 6.0 mA

OLAMP

per lamp in all configurations.

RMS

ELECTRICAL CHARACTERISTICS

LXMG1626-05-45

Min Typ Max

L(MAX)

L(MAX)

I

LL%DEV

L(MIN)

BURST

I

= Ground

SET

> 2.0VDC,

V

BRT_ADJ

I

= Open

SET

> 2.0VDC,

V

BRT_ADJ

I

= Open

SET

= 0VDC,

V

BRT_ADJ

I

= Ground; I

SET

V

BRT_ADJ

Output Burst Frequency 215 225 235 Hz

SLEEP

OUT

= 2.0VDC,

> 2.0VDC,

V

BRT_ADJ

> 2.0V, VIN = 5V

SLEEP

> 2.0V, VIN = 5V

SLEEP

> 2.0V, VIN = 5V

SLEEP

> 2.0V, VIN = 5V

= I

* SQRT of % duty cycle

MAX

> 2.0V, VIN = 5V

SLEEP

DC

DC

DC

DC

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 © 2005
Rev. 1.0, 2007-01-24

Microsemi

Integrated Products

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

Page 2

PanelMatch™ StayLit™ LXMG1626-05-45

TM

®

5V Dual 6W CCFL Programmable Inverter Module

PRODUCTION DATAS HE E T

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

= 0VDC -13 µADC

BRT_ADJ

BRT

I

BRT_ADJ

I

BRT_ADJ

V

SLEEP

V

SLEEP

V

0.4 V

L

V

SET

VIN = 5VDC,

IN(MIN)

IN(RUN)

η

= 3VDC 1 µADC

V

BRT_ADJ

= Maximum Lamp Current 2.0 2.05 VDC

O(LAMP)

= Minimum Lamp Current 0 VDC

O(LAMP)

2.1 VIN V

-0.3 0.8 V

≤ 0.4V -420 µA

SET

< 0.8V 0.0 12 50 µADC

SLEEP

VIN
V
VIN
V

= 5VDC,

LAMP

= 5VDC,

LAMP

= 435V

= 435V

SLEEP

RMS

SLEEP

RMS

≥ 2.0V, I

≥ 2.0V, I

= Ground

SET

= Ground

SET

LXMG1626-05-45

Min Typ Max

1090 mA

80 %

CONN PIN DESCRIPTION

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

CN1-1

VIN Main Input Power Supply (4.75V <

CN1-2

CN1-3

CN1-4

CN1-5

GND Power Supply Return

SLEEP

ON/OFF Control. (0V <

CN1-6 BRITE Brightness Control (0V to 2.0VDC). 2.0VDC 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 LXMG1626-05-45 (JST SM03(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00 )

CN2-1

CN2-2

CN2-3

CN2-4

V

HI1

V

HI2

NC

V

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

VIN < 5.25V)

SLEEP

< 0.8 = OFF,

SLEEP

>= 2.1V = ON

Units

DC

DC

DC

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Copyright © 2005
Rev. 1.0, 2007-01-24

Microsemi

Integrated Products

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

Page 3

PanelMatch™ StayLit™ LXMG1626-05-45

TM

®

5V Dual 6W CCFL Programmable Inverter Module

PRODUCTION DATAS HE E T

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

SET1 (Pin 7) Nominal Output Current

Open* 12mA
Ground 10mA

CN1

W

22mm

± 0.2

0.866in.

4.0mm

0.157in.

6.5mm

0.265in.
Max

16mm

0.630in.

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

OUTPUT CURRENT SETTINGS

PHYSICAL DIMENSIONS

113mm

4.45in.

GROUNDED MOUNTING
H

OLE 3MM ± 0.1 DIA.

SIMPLIFIED BLOCK DIAGRAM

TABLE 1

LXMG1626-05-45

UNPLATED MOUNTING HOLE 3MM ± 0.1 DIA.

6

MM HEAD CLEARANCE BOTH HOLES

83mm ± 0.2

3.27in.

CN2

weight: 15g

WWW.Microsemi .COM

30mm

1.181in.

W

1.0mm

0.0394in.

Copyright © 2005
Rev. 1.0, 2007-01-24

Microsemi

Integrated Products

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

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PanelMatch™ StayLit™ LXMG1626-05-45

TM

DAC or
Pot

500K

BRITE

LXMG1626-05-45

SLEEP
SET

FAULT

`

NC

NC

5V

V

IN

GND

TYPICAL APPLICATION

V

HI1

V

HI2

V

LO

Figure 1 – Brightness Control

(Output current set to maximum)

PWM Signal
from System

P.W.

10µs to 200µS

0<P.W. < 100 % of period

BRITE

LXMG1626-05-45

Figure 1A – PWM Brightness Control

5V

GND

V

HI1

V

HI2

V

LO

BRITE

LXMG1626-05-45

SLEEP

SET

FAULT

1

V

IN

Lamp(s) Status FAULT Inverter Operation

Normal

Operation

One Lamp

Open

Both Lamps

Open

One Lamp High

Side Short to

Ground

Low

High

High Shutdown

High

Normal full lamp

current

Normal @ ½ lamp

current*

Normal @ ½ lamp

current*

Both Lamps

High Side Short

High Shutdown

to Ground

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.

®

5V 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 manufactures 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 VIN supply.

input.

SLEEP

to high voltage wires from the

to circuit

LO

input or cycle the VIN

SLEEP

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Copyright © 2005
Rev. 1.0, 2007-01-24

Microsemi

Integrated Products

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

Page 5

PanelMatch™ StayLit™ LXMG1626-05-45

TM

®

NOTES

5V Dual 6W CCFL Programmable Inverter Module

PRODUCTION DATAS HE E T

PRELIMINARY DATA – Information contained in this document is pre-production data
and is proprietary to Microsemi. It may not be modified in any way without the express
written consent of Microsemi. Product referred to herein is offered in pre-p roduct ion form
only and may not have completed Microsemi’s Quality Assurance process for Release to
Production. Microsemi reserves the right to chang e or discontinue this propos ed product
at any time.

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WWW.Microsemi .COM

Copyright © 2005
Rev. 1.0, 2007-01-24

Microsemi

Integrated Products

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

Page 6