lx1686 Microsemi Corporation, lx1686 Datasheet

lx1686

Manufacturer Part Number

lx1686

Description

Digital Dimming Ccfl Controller Ic

Manufacturer

Microsemi Corporation

Datasheet

1.LX1686.pdf (5 pages)

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Download datasheet (140Kb)

H E

The LX1686 Backlight Controller IC

provides all the control functions needed

to implement Linfinity’s direct drive in-

verters used to operate cold cathode fluo-

rescent lamps (CCFL’s). This IC can be

used to control single or multiple-lamp

configurations. CCFL’s are used for back

or edge lighting of liquid crystal flat panel

displays (LCD’s) and typically find appli-

cation in notebook computers, web

browsers, automotive and industrial in-

strumentation, and entertainment sys-

tems.

trolled lamp current burst circuit that

can provide a >100:1 dimming range from

a simple zero to 2.5V potentiometer in-

put.

easily synchronized to the LCD panel’s

frame rate to prevent interference from

optical beat frequencies.

NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.

The LX1686 includes a PWM con-

N F I N I T E

The PWM dimming burst rate is

11861 W

O W E R

Standard Analog

Dimming Inverter

Light Output (Nits)

ESTERN

D E S C R I P T I O N

O F

I N

Note: All surface-mount packages are available in Tape & Reel.

VENUE

Append the letter "T" to part number. (i.e. LX1686CPWT)

LinFinity's

RangeMAX

N N O V A T I O N

I N I T Y

, G

clude a new dual feedback contol loop

that permits regulation of maximum lamp

strike voltage as well as lamp current.

Regulating maximum lamp voltage per-

mits the designer to provide for ample

worst case lamp strike voltage while at

the same time conservatively limit maxi-

mum open circuit voltage.

generation technique enables the mod-

ule designer to optimize high voltage

transformer design for maximum oper-

ating efficiency with no power dissipat-

ing overhead to guarantee strike capa-

bility.

nant, oscillator-controlled PWM regu-

lation method. The LX1686 allows a

wide choice of fixed operating frequen-

cies to match lamp current frequency to

the lamp’s most efficient operating point,

and to minimize high frequency interfer-

ence.

P A C K A G E O R D E R I N F O

ARDEN

Safety and reliability features in-

An innovative new strike voltage

Direct drive topology is a non-reso-

P R O D U C T H I G H L I G H T

0 to 85

105

(°C)

ROVE

I C R O E L E C T R O N I C S

, CA. 92841, 714-898-8121, F

RangeMAX

Light emitted by a CCFL is proportional to the current

flowing through it. There are two ways to control the

current: by adjusting the amplitude of a continuous AC

current; or, as with RangeMAX technology, by varying

the amount of time a burst of full current is present.

RangeMAX technology frees the backlight inverter

module designer to operate in a lower brightness and

lower power consumption mode than is possible with

conventional amplitude control methods.

LX1686CPW

Plastic TSSOP

24-pin

I G I T A L

R E L I M I N A R Y

I M M I N G

N C

: 714-893-2570

RangeMAX

Synchronizable To Display Video Frequency

High Voltage Feedback Loop Directly

Controls Maximum Open Lamp And

Minimum Strike Voltages

Transformer Protected From Over-Heating

During Lamp Striking

Micro-Amp Sleep Mode

User-Programmable Fixed Frequency

Operation

Under-Voltage Lockout Feature With Power-

Up Reset

Built-In Soft-Start Feature

Operates With 3.3V or 5V Power Supplies

100mA Output Drive Capability

Notebooks

Instrumentation Displays

Desktop Computer Monitors

Low Ambient Light Displays (used in

Aircraft, Automobiles, and Hand-held

Equipment)

Extemely High Efficiency From 3.3V or 5V

Power Supplies

Lower Cost Than Conventional Buck / Royer

Inverter Topologies

Improved Lamp Strike Capability

Improved Over-Voltage Control

C C F L C

K E Y F E A T U R E S

A P P L I C A T I O N S

A T A

B E N E F I T S

Wide Range Dimming (>100:1)

O N T R O L L E R

LX1686

H E E T

I C

Related parts for lx1686

lx1686 Summary of contents

Page 1

... Plastic TSSOP PW T (°C) A 24-pin LX1686CPW Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX1686CPWT CA. 92841, 714-898-8121, F VENUE ARDEN ...

Page 2

... D_OLSNS RangeMAX PACKAGE PIN OUTS AOUT VSS_P VSS AFD_C RAMP_C RAMP_R FVERT PD_CR VCO_C BRT_POS BRITE DIG_DIM PW PACKAGE (Top View 85°C, VDD=VDD_P= 3.0 to 5.5V 0.22µ 0.047µ 110k .) PDC PD LX1686 Min. Typ 1000pF A B 2.7 160 2.25 0.75 10 -2.3 -2.55 2.3 2.65 2.25 0.75 1.4 1.5 1.55 1.65 84 ...

Page 3

... SK_OUTBUF AOUT, BOUT = 1V, VDD = 3V I AOUT, BOUT = 0V, VDD = 3V S_OUTBUF AOUT, BOUT = 2V, VDD = Design Reference Only MAX_IR R Design Reference Only O_VBG V VDD = 3V EN3V V VDD = 5.5V EN5.5 V H_EN3 V H_EN5.5 LX1686 LX1686 Min. Typ. Max. 40 200 VDD/2 50 2.5 0.65 -6.4 -5.8 -5.2 250 1000 0 VDD 2.35 2.5 2.65 2.35 2.5 2.65 0.35 0.5 0.65 0.35 0.5 ...

Page 4

... LX1686 Pin Pin Number Designator Description ...

Page 5

... FIGURE 1 — LX1686 Block Diagram RangeMAX and is a trademark of Linfinity Microelectronics Inc. LX1686 ...

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