LX1688CPW Microsemi Analog Mixed Signal Group, LX1688CPW Datasheet

LX1688CPW

Manufacturer Part Number

LX1688CPW

Description

IC CTRLR CCFL BACKLIGHT 24TSSOP

Manufacturer

Microsemi Analog Mixed Signal Group

Type

CCFL Controllerr

Datasheet

1.LX1688CPW.pdf (16 pages)

Specifications of LX1688CPW

Frequency

60 ~ 70 kHz

Current - Supply

5.5mA

Current - Output

100mA

Voltage - Supply

3 V ~ 5.5 V

Operating Temperature

0°C ~ 70°C

Package / Case

24-TSSOP

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 16
Download datasheet (485Kb)

Rev. 1.2, 2006-03-09

current/voltage mode, switching regulator

that provides the control function for Cold

Cathode Fluorescent Lighting (CCFL).

This controller can be used to drive a

single lamp, but is specifically designed

for multiple lamp LCD panels. The IC can

be configured as a master or slave and

synchronize up to 12 controllers.

The LX1688 includes highly integrated

universal ‘PWM or DC’ dim input that

allows either a PWM or DC input to adjust

brightness

conditioning, since a single external

capacitor CPWM can be used to integrate

a PWM input. Burst mode dimming is

possible if the user supplies a low

frequency PWM signal on the BRITE

input and no CPWM capacitor is used. The

controller utilizes Microsemi’s patented

direct drive fixed frequency topology and

patented resonant lamp strike generation

technique.

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

The LX1688 is a fixed frequency, dual

CONNECTOR

INPUT

FAULT 1

FAULT 2

without

DIMMING (BRITE)

ENABLE

requiring

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

ENABLE

MASTER

LX1688

SLAVE

VDD

FAULT 2

Simplified Quad Lamp Inverter Showing Synchronized Output Waveforms

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1688CPW-TR)

-40 to 85

FAULT 1

0 to 70

BRITE

D E S C R I P T I O N

(°C)

external

dual feedback control loop that permits

regulation of maximum lamp strike voltage

as well as lamp current.

maximum lamp voltage permits the designer

to provide for ample worst-case lamp strike

voltage

maximum open circuit voltage. In addition

the

shutdown for an open or broken lamp, and a

lamp fault detection with a status reporting

output.

includes the ability to select the polarity of

both the chip enable and dim (BRITE)

inputs. Also included is a switched VDD

output of up to 10mA that will allow the

user to power other circuitry that can be

switched on and off with the inverters

enable input.

power sleep mode with no additional

components.

STATUS

STRIKE

STATUS

STRIKE

3.0V

Safety and reliability features include a

To improve design flexibility the IC

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

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

controller

Integrated Products Division

while

Microsemi

http://www.microsemi.com

This preserves the micro

5.5V

features

conservatively

RangeMAX™

LAMPS

RoHS compliant / Pb-free Transition DC: 0442

include

Multiple Lamp CCFL Controller

Regulating

limiting

Plastic TSSOP

24-Pin

auto

LX1688CPW

RODUCTION

LX1688IPW

125 Hz 5% Duty cycle Burst

65KHz run frequency

Ch3

10.0mV Ω

A P P L I C A T I O N S / B E N E F I T S

Provision to Synchronize Lamp

Current & Frequency With Other

Controllers

Dimming With Analog or Digital

(PWM) Methods (>20:1)

Programmable Fixed Frequency

Adjustable Power-up Reset

ENABLE/BRITE Polarity Selection

Voltage Limiting on Step-up

Transformer Secondary Winding

Open Lamp Timeout Circuitry

Switched VDD Output (10mA)

Micro-Amp Sleep Mode

Operates With 3.3V to 5V Supply

100mA Output Drive Capability

Desktop LCD Monitors

Multiple Lamp Panels

Low Ambient Light Displays

High Efficiency

Lower Cost than Conventional

Buck/Royer Inverter Topologies

Improved Lamp Strike Capability

Improved Over-Voltage Control

ATA

K E Y F E A T U R E S

Ch2

HEET

10.0mV Ω

100µs

LX1688

Page 1

Related parts for LX1688CPW

LX1688CPW Summary of contents

Page 1

... Simplified Quad Lamp Inverter Showing Synchronized Output Waveforms T (° - Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1688CPW-TR) Copyright © 2001 Rev. 1.2, 2006-03-09 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 RangeMAX™ ® ...

Page 2

Supply Voltage (VDD_P, VDD)................................................................................ 6.5V Digital Inputs ................................................................................... -0.3V to VDD +0.5V Analog Inputs.................................................................................. –0.1V to VDD ...

Page 3

Supply Voltage ( DDP BRITE Linear ...

Page 4

Parameter STRIKE AND ...

Page 5

Typical Operating Current (VDD) 6 5.5 VDD=5.5V 5 4.5 VDD=3V 4 3.5 3 -40 -15 10 Temperature (°C) Output ...

Page 6

TM Pin BEPOL V DD FLOAT Conventional polarity means that the lamp brightness increases with increasing voltage on the BRITE pin. Reverse polarity means that brightness decreases with increasing voltage Controller Controller Input Pin: Mode Operation OLSNS ...

Page 7

TM The LX1688 is a backlight controller specifically designed with a special feature set needed in multiple lamp desktop monitors, and other multiple lamp displays. While utilizing the same architecture as Microsemi’s LX1686 controller it eliminates the synchronized digital dimming ...

Page 8

TM and may or may not be externally synchronized to the LCD video frame rate. It will directly gate the signal BRT. CPWM should not be used in this case AULT IN The fault pin is a digital ...

Page 9

TM CN1 VIN 1 C1 VIN 2 GND 3 GND 4 5 VBRITE 6 RMP_RST 7 RMP_RST PHA_SYNC PHA_SYNC 8 ENABLE 9 VDDSW AOUT 16V 10% 470nF 2 VSS_P Analog Ground must 3 VSS connect to power ...

Page 10

TM A LX1688 PPLICATION EXAMPLE WITH This section will highlight the features of LX1688 controller by showing a practical example. Three identical inverter modules are connected to each other and each module drives a single lamp. One module configured as ...

Page 11

470nF 16V 1 10% VIN 1 VIN 2 GND 3 GND 4 5 VBRITE 6 RMP_RST 7 PHA_SYNC 8 ENABLE 9 1 VDDSW 0 VBRITE C5 : 220nF 16V 10 82nF 16V 10 ...

Page 12

TM Multiple Lamp Sync The figure 3 shows the sync signals (PHA_SYNC and RMP_RST) timing relationship to Gate signal AOUT, for the master module. AOUT and PHA_SYNC running at the same frequency and RMP_RST signal has the twice frequency. Figure ...

Page 13

TM Digital Dimming The following oscilloscope waveforms are showing gate signals of Master and slaves during digital dimming at 50% and 5% duty cycle. Figure 6- Gate signals during digital dimming with 50% duty cycle CH2= A CH3=A (Slave1), CH4=A ...

Page 14

Reference Part Description Designator Backlight Controller U1 Dual ...

Page 15

TM PW 24-Pin Thin Small Shrink Outline (TSSOP) Package E F SEATING PLANE * Lead Coplanarity Note: Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall not include solder coverage. ...

Page 16

TM 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 ...

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