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參數(shù)資料
| 型號： | MAX8722 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost CCFL Backlight Controller |
| 中文描述： | 低成本CCFL背光控制器 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 331K |
| 代理商： | MAX8722 |
General Desc ription
The MAX8722 integrated backlight controller is opti-
mized to drive cold-cathode fluorescent lamps (CCFLs)
using a full-bridge resonant inverter architecture.
Resonant operation maximizes striking capability and
provides near-sinusoidal waveforms over the entire
input range to improve CCFL lifetime. The controller
with high power to light efficiency. The device also
includes safety features that effectively protect against
many single-point fault conditions including lamp-out
and short-circuit faults.
The MAX8722 achieves 10:1 dimming range by “chop-
ping” the lamp current on and off using a digital pulse-
width modulation (DPWM) method. The DPWM frequency
can be accurately adjusted with a resistor or synchro-
nized to an external signal. The brightness is controlled
by an analog voltage on the CNTL pin. The device direct-
ly drives the four external n-channel power MOSFETs of
the full-bridge inverter. An internal 5.3V linear regulator
powers the MOSFET drivers, the DPWM oscillator, and
most of the internal circuitry. The MAX8722 is available in
a low-cost, 24-pin QSOP package and operates over a
-40°C to +85°C temperature range.
Applic ations
Notebook Computer Displays
LCD Monitors
LCD TVs
Features
Synchronized to Resonant Frequency
Longer Lamp Life
Guaranteed Striking Capability
High Power to Light Efficiency
Wide Input Voltage Range (4.6V to 28V)
Input-Voltage Feed-Forward for Excellent Line
Rejection
Accurate Dimming Control with Analog Interface
10:1 Dimming Range
Adjustable Accurate DPWM Frequency with Sync
Function
Adjustable Lamp Current Rise and Fall Time
Secondary Voltage Limit Reduces Transformer
Stress
Lamp-Out Protection with Adjustable Timeout
Secondary Overcurrent Protection with
Adjustable Timeout
Low-Cost 24-Pin QSOP Package
M
Low-Cost CCFL Bac klight Controller
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
Ordering Information
19-3321; Rev 0; 6/04
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
-40
°
C to +85
°
C
PIN-PACKAGE
24 QSOP
MAX8722EEG
MAX8722
GND
GH2
VFB
ISEC
LX2
BST2
BST1
LX1
GH1
GL1
V
DD
BATT
IFB
GL2
CNTL
ILIM
FREQ
SYNC
PGND
COMP
VIN
V
CC
DPWM
TFLT
V
CC
V
CC
SHDN
Minimal Operating Circ uit
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
GND
V
CC
V
DD
PGND
TFLT
ILIM
BATT
TOP VIEW
GL2
GL1
GH1
LX1
FREQ
SYNC
DPWM
CNTL
16
14
13
9
10
11
12
BST1
BST2
LX2
GH2
ISEC
VFB
IFB
COMP
QSOP
MAX8722
SHDN
Pin Configuration
相關PDF資料 |
PDF描述 |
|---|---|
| MAX8722EEG | Low-Cost CCFL Backlight Controller |
| MAX8726EUE | Triple-Output TFT-LCD DC-DC Converters |
| MAX8729 | Constant-Frequency, Half-Bridge CCFL Inverter Controller |
| MAX8729EEI | Constant-Frequency, Half-Bridge CCFL Inverter Controller |
| MAX8740 | TFT-LCD Step-Up DC-DC Converter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8722AEEG | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX8722AEEG+ | 功能描述:顯示驅(qū)動器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX8722AEEG+T | 功能描述:顯示驅(qū)動器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX8722AEEG-T | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX8722AETE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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