LXMG1626-05-46 - Microsemi Corp.

PRODUCTION DATASHEET

Microsemi

Analog Mixed Signal Group

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

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LXMG1626-05-46

5V Dual 6W CCFL Programmable Inverter Module

TM ®

DESCRIPTION

The LXMG1626-05-46 is a Dual 6W

Output Direct Drive CCFL (Cold Cathode

Fluorescent Lamp) Inverter Module

specifically designed to be compatible

with variety of LCD panels that have both

lamps on one side of the panel and use a

single common lamp return wire.

LXMG1626 modules provide the

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,

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

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.

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™ featur e.

RangeMAX Digital Dimming

Technique provides flicker-free

brightness control in any wide range

typically (100:1+) dimming application.

The resultant “burst drive” that

energizes the lamp is designed

specifically to ensure that no premature

lamp degradation occurs, while allowing

significant power savings at lower dim

levels.

The design utilizes Microsemi’s

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.

Other benefits of this new topology

are stable fixed-frequency operation,

secondary-side strike-voltage regulation

and both open/shorted lamp 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

 StayLit™ Continued Operation

with Single Open Lamp Failure

 Fixed Frequency Operation

 Fault Output Signal

 Rated From -30 to 80°C

 RoHS Compliant

 UL60950 E175910



APPLICATIONS

 Dual Lamp LCD’s Requiring a

Shared Common Lamp Return

 Mates to a Single JST BHR-

04VS-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

PRODUCT HIGHLIGHT

OUTPUT

UNIVERSAL DIMMING INPUT

"PWM", VDC, OR POTENTIOMETER

Lamp current 5 or 6mA per Lamp

123

DC Voltage

Source Potentiometer PWM

Signal

INPUT

Microsemi

Lamp

Fault

Signal

PACKAGE ORDER INFO

PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY

TO PANEL CONNECTORS

LXMG1626-05-46 JST SM04(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00 or equivalent JST BHR-04VS-1

-0

-4

PRODUCTION DATASHEET

Microsemi

Analog Mixed Signal Group

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

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LXMG1626-05-46

5V Dual 6W CCFL Programmable Inverter Module

TM ®

ABSOLUTE MAXIMUM RATINGS

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

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

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

Output Current (per lamp) ...........................................................................................................6.6mARMS (Internally Limited)

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

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

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.

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 4.5 5.5 W

Linear BRITE Control Input Voltage Range VBRT_ADJ 0 2.0 V

Lamp Operating Voltage VLAMP 320 370 420 VRMS¹

Lamp Current (Full Brightness, per lamp) IOLAMP 5.0 6.0 mARMS²

Operating Ambient Temperature Range TA -30 80 °C

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 5V the inverter may not be able to output the full 6mARMS per lamp in all configurations.

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.

LXMG1626-05-46

Parameter Symbol Test Conditions Min Typ Max

Units

` OUTPUT PIN CHARACTERISTICS

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

ISET = Ground 9 10 11 mARMS

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

ISET = Open 11 12 13 mARMS

Output Current Lamp to Lamp

Deviation ILL%DEV VBRT_ADJ > 2.0V, SLEEP > 2.0V, VIN = 5V

ISET = Open 5 %

Min. Average Lamp Current IL(MIN) VBRT_ADJ = 0V, SLEEP > 2.0V, VIN = 5V

ISET = Ground; IOUT = IMAX * SQRT of % duty cycle 1.6 mARMS

Lamp Start Voltage VLS V

IN > 4.5V 1250 1400 VRMS

Operating Frequency fO VBRT_ADJ = 2.0V, SLEEP > 2.0V, VIN = 5V 55.2 57.6 60 kHz

Burst Frequency fBURST Output Burst Frequency 215 225 235 Hz

FAULT Output Voltage High FAULTVH FAULT = -10uA 2.9 3.4 V

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

PRODUCTION DATASHEET

Microsemi

Analog Mixed Signal Group

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

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LXMG1626-05-46

5V Dual 6W CCFL Programmable 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.

LXMG1626-05-46

Parameter Symbol Test Conditions Min Typ Max

Units

` BRITE INPUT

VBRT_ADJ = 0V -13 µADC

Input Current IBRT VBRT_ADJ = 3V 1 µADC

Minimum Input for Max. Lamp Current VBRT_ADJ I

O(LAMP) = Maximum Lamp Current 1.9 2.0 V

Maximum Input for Min. Lamp Current VBRT_ADJ I

O(LAMP) = Minimum Lamp Current 0 V

` SLEEP BAR INPUT

RUN Mode SLEEP

V 2.1 VIN V

SLEEP Mode SLEEP

V -0.3 0.8 V

` SET INPUT

SET Low Threshold V

L 0.4 V

Input Current ISET V

SET ≤ 0.4V -420 µA

` POWER CHARACTERISTICS

Sleep Current IIN(MIN) VIN = 5V, SLEEP < 0.8V 0.0 12 50 µADC

Run Current IIN(RUN) VIN = 5V, SLEEP ≥ 2.0V, ISET = Ground

VLAMP = 370VRMS 870 mADC

Efficiency η VIN = 5V, SLEEP ≥ 2.0V, ISET = Ground

VLAMP = 370VRMS 85 %

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 ≤ 0.8 = OFF, SLEEP ≥ 2.1V = ON

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

CN1-7 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 LXMG1626-05-46 (JST SM03(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00 or equivalent )

CN2-1

VHI1 High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.

DO NOT connect to ground.

CN2-2

VHI2 High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.

DO NOT connect to ground.

CN2-3

NC No Connect

CN2-4

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

DO NOT connect to ground

PRODUCTION DATASHEET

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Analog Mixed Signal Group

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

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LXMG1626-05-46

5V Dual 6W CCFL Programmable Inverter Module

TM ®

TABLE 1

OUTPUT CURRENT SETTINGS

SET1

(Pin 7) Nominal Output Current

Open* 12mA

Ground 10mA

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

PHYSICAL DIMENSIONS

LXMG1626-05-46

CN1

16mm

0.630in.

4.0mm

0.157in.

83mm ± 0.2

3.27in.

30mm

1.181in.

113mm

4.45in.

1.0mm

0.0394in.

6.5mm

0.265in.

Max weight: 15g

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

UNPLATED MOUNTING HOLE 3MM ± 0.1 DIA.

6MM HEAD CLEARANCE BOTH HOLES

GROUNDED MOUNTING

HOLE 3MM ± 0.1 DIA.

CN2

W22mm

± 0.2

0.866in.

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 si de of

the board to any conductor

All dimensions are in millimeters, inches are for reference only

SIMPLIFIED BLOCK DIAGRAM

PRODUCTION DATASHEET

Microsemi

Analog Mixed Signal Group

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

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LXMG1626-05-46

5V Dual 6W CCFL Programmable Inverter Module

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TYPICAL APPLICATION

LXMG1626-05-46

FAULT

`GND

VHI2

VLO

BRITE VIN

SLEEP

SET

500K

DAC or

Pot

NC NC

VHI1

Figure 1 – Brightness Control

(Output current set to maximum)

Figure 1A – PWM Brightness Control

LXMG1626-05-46

FAULT GND

VHI2

VLO

SLEEP

SET

BRITE

VIN VHI1

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

High Normal @ ~½ lamp

current*

Both Lamps High

Side Short to

Ground

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.

 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 micro-

controller 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 SLEEP input.

 Connect VHI1 and VHI2 to high voltage wires from the

lamps. Connect VLO to the low voltage lamp return wire

(wire with thinner insulation). Never connect VLO to circuit

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 temporarily. 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 shorts 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 SLEE

input or cycle the VIN input

supply. In fault induced shutdown mode the inverter will

draw about 15mA from VIN supply.

P . W.

10 µs to 200 µS

BRITE

LXMG 1626 -05-46

0 < P. W . < 100 % of period

PWM Signal

from System

PRODUCTION DATASHEET

Microsemi

Analog Mixed Signal Group

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

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PanelMatch

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LXMG1626-05-46

5V Dual 6W 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