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MAX8785AETI+

更新时间： 2024-11-21 20:38:59
品牌 Logo 应用领域
美信 - MAXIM 信息通信管理
页数 文件大小 规格书
19页 298K
描述
Fluorescent Light Controller, 63kHz Switching Freq-Max, BICMOS, 5 X 5 MM, 0.75 MM HEIGHT, LEAD FREE, TQFN-28

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MAX8785AETI+ 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Not Recommended零件包装代码：QFN
包装说明：HVQCCN, LCC28,.2SQ,20针数：28
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.31.00.01Factory Lead Time：14 weeks
风险等级：5.21模拟集成电路 - 其他类型：FLUORESCENT LIGHT CONTROLLER
控制技术：PULSE WIDTH MODULATION最大输入电压：28 V
最小输入电压：4.5 V标称输入电压：12 V
JESD-30 代码：S-XQCC-N28长度：5 mm
湿度敏感等级：1功能数量：1
端子数量：28最高工作温度：85 °C
最低工作温度：-40 °C标称输出电压：5.35 V
封装主体材料：UNSPECIFIED封装代码：HVQCCN
封装等效代码：LCC28,.2SQ,20封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：NOT SPECIFIED
电源：5 V认证状态：Not Qualified
座面最大高度：0.8 mm子类别：Switching Regulator or Controllers
标称供电电压 (Vsup)：5 V表面贴装：YES
切换器配置：PUSH-PULL最大切换频率：63 kHz
技术：BICMOS温度等级：INDUSTRIAL
端子形式：NO LEAD端子节距：0.5 mm
端子位置：QUAD处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：5 mmBase Number Matches：1

MAX8785AETI+ 数据手册

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19-0600; Rev 1; 5/08  
Full-Bridge Controller for  
Piezoelectric Transformers  
MX785A  
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.  
o Resonant, All n-Channel, Full-Bridge Topology  
o Wide Input-Voltage Range (4.5V to 28V)  
o Frequency Sweeping Guarantees CCFL Striking  
o Feed-Forward Control Provides Excellent Line-  
Transient Response  
o Programmable Maximum Switching Frequency  
o Analog or Digital DPWM  
o Lamp-Out Detection with Adjustable Timeout  
o Fault Protection with Adjustable Timeout  
o Primary Current Limit with R  
Sensing  
DS(ON)  
o Strong Gate Drivers Support Large  
External MOSFETs  
o 28-Pin Thin QFN Package  
The MAX8785A employs a feed-forward control architec-  
ture that provides excellent line-and-load regulation while  
maintaining relatively constant switching frequency.  
The MAX8785A provides protection against open-lamp,  
secondary short-circuit, lamp arcing, and secondary  
overvoltage with adjustable timeout periods.  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX8785AETI+  
-40°C to +85°C  
28 Thin QFN*  
+Denotes lead-free package.  
*EP = Exposed pad.  
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.  
Pin Configuration  
TOP VIEW  
28 27 26 25 24 23 22  
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  
MAX8785A is available in a low-profile, 28-pin thin QFN  
package and operates over the -40°C to +85°C tempe-  
rature range.  
RATE  
SHDN  
CNTL  
LSYNC  
FLT  
1
2
3
4
5
6
7
21  
20  
19  
BST1  
+
V
DD1  
GL1  
18 PGND  
17 GL2  
MAX8785A  
Applications  
TFLT  
HF  
V
16  
15  
DD2  
Notebook LCDs  
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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