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LT1768CGN Datasheet

  • LT1768CGN

  • Linear Technology [High Power CCFL Controller for Wide Dimm...

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LT1768
High Power CCFL Controller
for Wide Dimming Range and
Maximum Lamp Lifetime
DESCRIPTIO
The LT
庐
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 65碌A. 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 鈥?24V
C1
33碌F
PGND
DI02
DI01
GATE
V
IN
V
REF
5V
0.1碌F
33pF
4
T1
10
5
3
2
C4
0.33碌F
1
250鈩?/div>
1/4W
Q1
Q1
C2
0.033碌F
SENSE FAULT
LT1768
V
C
SHDN
AGND
C
T
PROG
C4
10碌F
R
MIN
R
MAX
PWM
R4
16.2k
MBRS130T3
R2
40.2k
L1
68碌H
C3
0.1碌F
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 产品属性

  • LT1768

  • 100

  • 集成电路 (IC)

  • PMIC - 照明，镇流器控制器

  • -

  • CCFL 控制器

  • 300 ~ 410 kHz

  • 7mA

  • 1.5A

  • 9 V ~ 24 V

  • 0°C ~ 125°C

  • 16-SSOP（0.154"，3.90mm 宽）

  • 16-SSOP

  • 管件

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