lx1691 Microsemi Corporation, lx1691 Datasheet

lx1691

Manufacturer Part Number

lx1691

Description

Enhanced Multi-mode Ccfl Controller

Manufacturer

Microsemi Corporation

Datasheet

1.LX1691.pdf (2 pages)

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Current page: 1 of 2
Download datasheet (110Kb)

Rev. 1.2, 8/30/2006

reduced, enhanced feature set, Direct

Drive CCFL (Cold Cathode Fluorescent

Lamp) Controller. Its architecture is

based on the very popular LX1689. By

limiting V

advanced processing, die size and

package pin count is decreased while

improving dimming precision.

be designed for virtually any CCFL

appliance from digital cameras and

PDA’s to big screen monitors and

driver viewable automotive displays.

accept digital and analog control inputs

and provides six different dimming

modes that control both lamp current

amplitude and duty cycle, either simul-

taneously or separately. Designers can

select normal or reverse polarity

dimming and precisely program mini-

mum and maximum lamp currents with

resistors.

feature is enhanced to include regu-

lation and shutdown for over voltage

and over current conditions.

IMPORTANT: For the most current data, consult MICROSEMI’s website:

Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; Patents Pending

LX1691 based inverter modules can

New versatile dimming circuitry can

Microsemi’s LX1691 is a cost

The LX1691 fault shutdown

DDP

to 5.5V and using

Traditional Analog

Internal Digital

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

T = 512 / Lamp Frequency

-40 to +85

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1691IPW-TR)

D E S C R I P T I O N

BRITE_IN

(°C)

DD_CLK

+3V

Direct Drive architecture works with

system voltages from 3 volts to more

than 50 volts, limited only by the

external power FET’s that drive the high

voltage transformer.

proven and patented strike method that

allows significant efficiency gains while

guaranteeing strong striking power at all

operating temperatures. Our method

sweeps strike frequency smoothly up to

the unloaded resonant frequency of the

lamp and high voltage transformer.

This, coupled with the LX1691’s active

high output voltage regulation, produces

just enough strike voltage without

generating unpredictable high voltage

spikes that cause arcing and component

failures.

simply switch to a higher frequency for

striking do not have this “real time”

control over output voltage, and require

much more attention to transformer

design.

Four of Six Dimming Modes

The LX1691 includes the Microsemi

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

Microsemi’s proven and patented

Lamp Current (mA)

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

2.8V

Integrated Products

http://www.microsemi.com

Microsemi

Competitive

DDP

External Digital

Direct PWM (Analog)

Enhanced Multi-Mode CCFL Controller

5.5V

devices

T = 512 / DD_CLK Frequency

DDP

BRITE_IN

DD_CLK

RODUCTION

that

RoHS compliant / Pb-free

LX1691IPW

Plastic TSSOP

16-PIN

Lamp Current (mA)

Low Component Count / Module

High “Nits/Watt” Efficiency

Operates Directly From a Single

Industries Safest And Highest

Tight Operating Frequency

Simultaneous Amplitude And

Duty Cycle Dimming Modes

Resistor Programmable Min and

Max Lamp Currents

Digital Dimming Can Synch To

External Or Internal Clocks

100 ms Power On Delay

Open Or Shorted Lamp

Regulation & Shutdown

“On Chip” Full Wave Lamp

Current & Voltage Rectifiers

16 Pin TSSOP Package

Very Stable Oscillator with On-

Chip Timing Capacitor

Soft Start-Up Striking

Enhanced Digital Dimming

Resolution

Cost / And Size

Li-Ion Cell

Performing Strike Voltage

Generation (Patented)

Tolerance For Easier System

Level RFI Control

ATA

K E Y F E A T U R E S

B E N E F I T S

HEET

LX1691

Page 1

Related parts for lx1691

lx1691 Summary of contents

Page 1

... DD_CLK 512 / Lamp Frequency T (°C) A -40 to +85 Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1691IPW-TR) Copyright © 2003 Rev. 1.2, 8/30/2006 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Enhanced Multi-Mode CCFL Controller ® P RODUCTION Microsemi’ ...

Page 2

... To obtain a copy, please contact your local Microsemi sales representative. The name of your local representative can be obtained at the following link http://www.microsemi.com/contact/contactfind.asp or Contact us directly by sending an email to: IPGdatasheets@microsemi.com Be sure to specify the data sheet you are requesting and include your company name and contact information and or vcard. We look forward to hearing from you. Copyright 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® ...

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