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LT1768CGN#TR

Description
CCFL Controller 9V/12V/15V/18V 410kHz 16-Pin SSOP N T/R
File Size288KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LT1768CGN#TR Overview

CCFL Controller 9V/12V/15V/18V 410kHz 16-Pin SSOP N T/R

LT1768CGN#TR Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
SVHCYes
SVHC Exceeds ThresholdYes
TypeCCFL Controller
Maximum Operating Frequency (kHz)410
Minimum Operating Supply Voltage (V)8
Maximum Operating Supply Voltage (V)24
Typical Operating Supply Voltage (V)9|12|15|18
Typical Supply Current (mA)7
Minimum Operating Temperature (°C)0
Maximum Operating Temperature (°C)125
Supplier Temperature GradeCommercial
PackagingTape and Reel
Standard Package NameSOP
Pin Count16
Supplier PackageSSOP N
MountingSurface Mount
Package Height1.5(Max)
Package Length4.98(Max)
Package Width3.99(Max)
PCB changed16
Lead ShapeGull-wing
LT1768
High Power CCFL Controller
for Wide Dimming Range and
Maximum Lamp Lifetime
DESCRIPTIO
The LT
®
1768 is designed to control single or multiple cold
cathode fluorescent lamp (CCFL) displays. A unique Mul-
timode Dimming scheme* combines both linear and PWM
control functions to maximize lamp life, efficiency, and
dimming range. Accurate maximum and minimum lamp
currents can be easily set. The LT1768 can detect and
protect against lamp failures and overvoltage start-up
conditions. It is designed to provide maximum flexibility
with a minimum number of external components.
The LT1768 is a current mode PWM controller with a 1.5A
MOSFET driver for high power applications. It contains a
350kHz oscillator, 5V reference, and a current sense
comparator with a 100mV threshold. It operates from an
8V to 24V input voltage. The LT1768 also has undervoltage
lockout, thermal limit, and a shutdown pin that reduces
supply current to 65µA. It is available in a small 16-lead
SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Multimode Dimming is a trademark of Linear Technology Corporation.
*Patent Pending
FEATURES
s
s
s
s
s
s
s
s
s
s
s
Ultrawide Multimode Dimming
TM
Range
Multiple Lamp Capability
Programmable PWM Dimming Range and
Frequency
Precision Maximum and Minimum Lamp
Currents Maximize Lamp Lifetime
No Lamp Flicker Under All Supply and Load
Conditions
Open Lamp Detection and Protection
350kHz Switching Frequency
1.5A MOSFET Gate Driver
100mV Current Sense Threshold
5V Reference Voltage Output
The 16-Lead SSOP Package
APPLICATIO S
s
s
s
s
Desktop Flat Panel Displays
Multiple Lamp Displays
Notebook LCD Displays
Point of Sale Terminal Displays
TYPICAL APPLICATIO
C4-WIMA MKP2
L1-COILTRONICS UP4-680
T1-2 CTX110607 IN PARALLEL
Q1-ZDT1048
*R5 CAN BE METAL PCB TRACE
33pF
LAMP
6
LAMP
V
IN
8V – 24V
C1
33µF
PGND
DI02
DI01
GATE
V
IN
V
REF
5V
0.1µF
33pF
4
T1
10
5
3
2
C4
0.33µF
1
250Ω
1/4W
Q1
Q1
C2
0.033µF
SENSE FAULT
LT1768
V
C
SHDN
AGND
C
T
PROG
C4
10µF
R
MIN
R
MAX
PWM
R4
16.2k
MBRS130T3
R2
40.2k
L1
68µH
C3
0.1µF
PROG
0V TO 5V OR
1kHz PWM
Si3456DY
100
R3
60.4k
R1
49.9k
2200pF
R5*
0.025
1768 TA01
Figure 1. 14W CCFL Supply Produces a 100:1 Dimming Ratio While
Maintaining Minimum and Maximum Lamp Current Specifications
U
U
U
Lamp Output and Dimming
Ratio vs Lamp Current
10000
1000
DIMMING RATIO (NITS/NITS)
100
LAMP OUTPUT (NITS)
10
1
LAMP MANUFACTURERS
SPECIFIED CURRENT RANGE
0.1
0
2
6
8
4
LAMP CURRENT (mA)
10
1768 TA01b
1

LT1768CGN#TR Related Products

LT1768CGN#TR LT1768CGN#PBF LT1768CGN#TRPBF LT1768CGN LT1768IGN#PBF LT1768IGN#TRPBF LT1768IGN
Description CCFL Controller 9V/12V/15V/18V 410kHz 16-Pin SSOP N T/R CCFL Controller 9V/12V/15V/18V 410kHz 16-Pin SSOP N Tube CCFL Controller 9V/12V/15V/18V 410kHz 16-Pin SSOP N T/R CCFL Controller 9V/12V/15V/18V 410kHz 16-Pin SSOP N CCFL Controller 9V/12V/15V/18V 410kHz Automotive 16-Pin SSOP N Tube CCFL Controller 9V/12V/15V/18V 410kHz Automotive 16-Pin SSOP N T/R CCFL Controller 9V/12V/15V/18V 410kHz 16-Pin SSOP N
EU restricts the use of certain hazardous substances Not Compliant Compliant Compliant Not Compliant Compliant Compliant Not Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Unconfirmed Active Active Unconfirmed Active Active Unconfirmed
Type CCFL Controller CCFL Controller CCFL Controller CCFL Controller CCFL Controller CCFL Controller CCFL Controller
Maximum Operating Frequency (kHz) 410 410 410 410 410 410 410
Minimum Operating Supply Voltage (V) 8 8 8 8 8 8 8
Maximum Operating Supply Voltage (V) 24 24 24 24 24 24 24
Typical Operating Supply Voltage (V) 9|12|15|18 9|12|15|18 9|12|15|18 9|12|15|18 9|12|15|18 9|12|15|18 18|9|12|15
Typical Supply Current (mA) 7 7 7 7 7 7 7
Maximum Operating Temperature (°C) 125 125 125 125 125 125 125
Supplier Temperature Grade Commercial Commercial Commercial Commercial Industrial Industrial Industrial
Standard Package Name SOP SOP SOP SOP SOP SOP SOP
Pin Count 16 16 16 16 16 16 16
Supplier Package SSOP N SSOP N SSOP N SSOP N SSOP N SSOP N SSOP N
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max)
Package Length 4.98(Max) 4.98(Max) 4.98(Max) 4.98(Max) 4.98(Max) 4.98(Max) 4.98(Max)
Package Width 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max)
PCB changed 16 16 16 16 16 16 16
Lead Shape Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing
Packaging Tape and Reel Tube Tape and Reel - Tube Tape and Reel -
HTS - - 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01
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