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| 型号： | MAX8785ETI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 1/19页 |
| 文件大小： | 0K |
| 描述： | IC CCFL CTRL 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | CCFL 控制器 |
| 电流 - 电源： | 1.5mA |
| 电源电压： | 4.5 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
19-0600; Rev 1; 5/08
ATION
AILABL
EVALU E
AV
KIT
Full-Bridge Controller for
Piezoelectric Transformers
General Description
Features
Liquid-crystal display (LCD) enclosures and cold-cathode
fluorescent lamps (CCFL) used in notebook computer
and portable electronic displays are becoming increa-
singly narrow, generating the need for a low-profile
CCFL power supply. Recent advances in piezoelectric
transformers (PZTs) have made it possible to develop
smaller, more efficient, and safer backlight inverters for
portable displays. Piezoelectric transformers have
shown better performance than magnetic transformers
with respect to efficiency, EMI requirements, human
safety, and form factor. The MAX8785A is a full-bridge
CCFL controller for piezoelectric transformer-based
backlight power supplies. The full-bridge topology pro-
vides a high-spectral purity sinusoidal drive that helps
the PZT convert electrical energy to mechanical and
back to electrical energy efficiently.
The MAX8785A employs a feed-forward control architec-
ture that provides excellent line-and-load regulation while
maintaining relatively constant switching frequency.
o
o
o
o
o
o
o
o
o
o
o
Resonant, All n-Channel, Full-Bridge Topology
Wide Input-Voltage Range (4.5V to 28V)
Frequency Sweeping Guarantees CCFL Striking
Feed-Forward Control Provides Excellent Line-
Transient Response
Programmable Maximum Switching Frequency
Analog or Digital DPWM
Lamp-Out Detection with Adjustable Timeout
Fault Protection with Adjustable Timeout
Primary Current Limit with R DS(ON) Sensing
Strong Gate Drivers Support Large
External MOSFETs
28-Pin Thin QFN Package
Ordering Information
The MAX8785A provides protection against open-lamp,
secondary short-circuit, lamp arcing, and secondary
overvoltage with adjustable timeout periods.
PART
MAX8785AETI+
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 Thin QFN*
The MAX8785A guarantees lamp striking by sweeping
the switching frequency from high to low until the lamp
is struck. The MAX8785A achieves 10:1 dimming range
using a digital pulse-width modulation (DPWM) method.
CCFL brightness can be set with an analog voltage on
the CNTL pin or through an external signal at LSYNC.
The maximum switching frequency and DPWM frequen-
cy can be adjusted with external resistors.
+Denotes lead-free package.
*EP = Exposed pad.
TOP VIEW
Pin Configuration
The MAX8785A gate drivers can drive large power
MOSFETs typically used in high-power CCFL applica-
tions. An internal 5.35V linear regulator powers the
MOSFET drivers and most of the internal circuitry. The
RATE
SHDN
1
2
28
+
27
26
25
24
23
22
21
20
BST1
V DD1
MAX8785A is available in a low-profile, 28-pin thin QFN
CNTL
3
19
GL1
package and operates over the -40°C to +85°C tempe-
rature range.
Applications
Notebook LCDs
LSYNC
FLT
TFLT
HF
4
5
6
7
MAX8785A
18
17
16
15
PGND
GL2
V DD2
BST2
LCD TVs and Monitors
8
9
10
11
12
13
14
THIN QFN
Simplified Operating Circuit appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8785EVKIT | 功能描述:显示开发工具 MAX8785 Eval Kit RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
| MAX8786GTL+ | 制造商:Maxim Integrated Products 功能描述:CONVERTOR - Bulk 制造商:Rochester Electronics LLC 功能描述: |
| MAX878LCSA | 制造商:Maxim Integrated Products 功能描述: |
| MAX878LESA | 制造商:Maxim Integrated Products 功能描述: |
| MAX8790AETP+ | 功能描述:LED照明驱动器 Six-String White LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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