参数资料
| 型号： | LT1768IGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR CCFL SGL/MULT HP 16SSOP |
| 标准包装： | 2,500 |
| 类型： | CCFL 控制器 |
| 频率： | 300 ~ 410 kHz |
| 电流 - 电源： | 7mA |
| 电流 - 输出： | 1.5A |
| 电源电压： | 9 V ~ 24 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
LT1768
High Power CCFL Controller
for Wide Dimming Range and
Maximum Lamp Lifetime
FEATURES
DESCRIPTIO
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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
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
Desktop Flat Panel Displays
APPLICATIO S
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lockout, thermal limit, and a shutdown pin that reduces
supply current to 65 μ A. It is available in a small 16-lead
SSOP package.
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Multiple Lamp Displays
Notebook LCD Displays
Point of Sale Terminal Displays
, LTC and LT are registered trademarks of Linear Technology Corporation.
Multimode Dimming is a trademark of Linear Technology Corporation.
*Patent Pending
TYPICAL APPLICATIO
33pF
C4-WIMA MKP2
LAMP
L1-COILTRONICS UP4-680
T1-2 CTX110607 IN PARALLEL
LAMP
6
10
Q1-ZDT1048
*R5 CAN BE METAL PCB TRACE
V IN
33pF
T1
8V – 24V
C1
33 μ F
4
5
3
2
C4
0.33 μ F
1
Lamp Output and Dimming
Ratio vs Lamp Current
PGND
GATE
10000
DI02
DI01
V IN
V REF
5V
250 ?
1/4W
Q1
Q1
1000
D IMMING RATIO (NITS/NITS)
SENSE
FAULT
0.1 μ F
100
LT1768
LAMP OUTPUT (NIT S)
C2
0.033 μ F
V C
AGND
SHDN
R MIN
R4
MBRS130T3
L1
68 μ H
10
PROG
C3
0.1 μ F
C T
PROG
R MAX
PWM
16.2k
R2
40.2k
100
Si3456DY
1
0.1
0
LAMP MANUFACTURERS
SPECIFIED CURRENT RANGE
2 4 6 8
10
0V TO 5V OR
1kHz PWM
R1
49.9k
C4
10 μ F
R3
60.4k
2200pF
R5*
0.025
LAMP CURRENT (mA)
1768 TA01b
1768 TA01
Figure 1. 14W CCFL Supply Produces a 100:1 Dimming Ratio While
Maintaining Minimum and Maximum Lamp Current Specifications
1
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