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MAX1739-MAX1839

更新时间： 2024-11-13 22:21:59
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
26页 442K
描述
Wide Brightness Range CCFL Backlight Controllers

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MAX1739-MAX1839 数据手册

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19-1755; Rev 1; 3/01  
Wide Brightness Range  
CCFL Backlight Controllers  
General Description  
Features  
The MAX1739/MAX1839 fully integrated controllers are  
optimized to drive cold-cathode fluorescent lamps  
(CCFLs) using the industry-proven Royer oscillator  
inverter architecture. The Royer architecture provides  
near sinusoidal drive waveforms over the entire input  
range to maximize the life of CCFLs. The MAX1739/  
MAX1839 optimize this architecture to work over a wide  
input voltage range, achieve high efficiency, and maxi-  
mize the dimming range.  
o Fast Response to Input Change  
o Wide Input Voltage Range (4.6V to 28V)  
o High Power-to-Light Efficiency  
o Minimizes Transformer Voltage Stress  
o Lamp-Out Protection with 2s Timeout  
o Buck Switch Short and Other Single-Point Fault  
Protection  
The MAX1739/MAX1839 monitor and limit the trans-  
former center-tap voltage when required. This ensures  
minimal voltage stress on the transformer, which  
increases the operating life of the transformer and  
eases its design requirements. These controllers also  
provide protection against many other fault conditions,  
including lamp-out and buck short faults.  
o Integrated Royer MOSFET Drivers Reduce  
Transformer Pin Count  
o Buck Operation Synchronized to Royer Oscillator  
o Synchronizable DPWM Frequency  
o Pin-Selectable Brightness Control Interface  
o SMBus Serial Interface (MAX1739)  
These controllers achieve 50:1 dimming range by  
simultaneously adjusting lamp current and “chopping”  
the CCFL on and off using a digitally adjusted pulse-  
width modulated (DPWM) method. CCFL brightness is  
controlled by an analog voltage or is set with an  
SMBusTM-compatible two-wire interface (MAX1739).  
o Analog Interface (MAX1739/MAX1839)  
Ordering Information  
The MAX1739/MAX1839 drive an external high-side  
N-channel power MOSFET and two low-side N-channel  
power MOSFETs, all synchronized to the Royer oscilla-  
tor. An internal 5.3V linear regulator powers the MOS-  
FET drivers and most of the internal circuitry. The  
MAX1739/MAX1839 are available in space-saving  
20-pin QSOP packages and operate over the -40°C to  
+85°C temperature range.  
PART  
TEMP. RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
20 QSOP  
MAX1739EEP  
MAX1839EEP  
20 QSOP  
Pin Configuration  
________________________Applications  
Notebook/Laptop Computers  
Car Navigation Displays  
LCD Monitors  
TOP VIEW  
REF  
1
2
3
4
5
6
7
8
9
20 BATT  
19 DH  
18 LX  
MINDAC  
CCI  
Point-of-Sale Terminals  
Portable Display Electronics  
CCV  
17 BST  
MAX1739  
SH/SUS  
CRF/SDA  
CTL/SCL  
MODE  
16 VL  
15 GND  
14  
CS  
13 DL1  
12 DL2  
11 SYNC  
CSAV  
CTFB 10  
†
Patent pending  
QSOP  
Pin Configurations continued at end of data sheet.  
SMBus is a trademark of Intel Corp.  
________________________________________________________________ Maxim Integrated Products  
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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