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MAX1996A

更新时间： 2024-01-23 06:11:04
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
28页 1119K
描述
High-Efficiency.Wide Brightness Range.CCFL Backlight Controller

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MAX1996A 数据手册

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19-2267; Rev 1; 10/02  
High-Efficiency, Wide Brightness  
Range, CCFL Backlight Controller  
General Description  
Features  
The MAX1996A integrated controller is optimized to  
drive cold-cathode fluorescent lamps (CCFLs) using  
synchronized full-bridge inverter architecture.  
Synchronized drive provides near sinusoidal waveforms  
over the entire input range to maximize the life of  
CCFLs. The controller also operates over a wide input-  
voltage range with high efficiency and broad dimming  
range.  
o SMBus Slave Address (0x58) for Wide Dimming  
Range Inverters  
o Guaranteed 200Hz to 220Hz DPWM Frequency  
o Externally Synchronizable DPWM Frequency  
o Lamp-Out Protection with 1s Timeout  
o Synchronized to Resonant Frequency  
Good Crest Factor for Longer Lamp Life  
Ensures Maximum Strike Capability  
The MAX1996A includes safety features that limit the  
transformer secondary voltage and protect against sin-  
gle-point fault conditions including lamp-out and short-  
circuit faults.  
o High Power-to-Light Efficiency  
o Wide Dimming Range (3 Methods)  
Lamp Current Adjust: >3 to 1  
DPWM: >10 to 1  
The MAX1996A regulates the CCFL brightness in three  
ways: linearly controlling the lamp current, digital pulse-  
width modulating (DPWM) the lamp current, or using  
both methods simultaneously to achieve the widest  
dimming range (>30:1). CCFL brightness can be con-  
trolled with either an analog voltage or a 2-wire  
SMBus™-compatible interface. The MAX1996A directly  
drives the four external N-channel power MOSFETs of  
the full bridge inverter. An internal 5.3V linear regulator  
powers the MOSFET drivers, the synchronizable DPWM  
oscillator, and most of the internal circuitry.  
Combined: >30 to 1  
o Feed-Forward for Fast Response to Step Change  
of Input Voltage  
o Wide Input-Voltage Range (4.6V to 28V)  
o Transformer Secondary Voltage Limiting to  
Reduce Transformer Stress  
o Protected Against Short-Circuit and Other Single-  
The MAX1996A has the same pin configuration as the  
MAX1895, but with modified SMBus slave address  
(0x58) and command bytes. In addition, the lamp-out  
protection timer has been reduced to approximately 1s  
and the DPWM frequency is guaranteed from 200Hz to  
220Hz over the operating temperature range without  
external components or trimming. The MAX1996A is  
available in the space-saving 28-pin thin QFN package  
and operates over a -40°C to +85°C temperature  
range.  
Point Faults  
o Dual-Mode Brightness Control Interface  
✕
o Small Footprint 28-Pin Thin QFN (5mm 5mm)  
Package  
Pin Configuration  
Applications  
TOP VIEW  
Notebook Computers  
Multibulb LCD Monitors  
Portable Display Electronics  
ILIM  
REF  
1
2
3
4
5
6
7
21 GH2  
20 LX2  
19 BST2  
18 BST1  
17 LX1  
16 GH1  
15 GL1  
Ordering Information  
MINDAC  
GND  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
28 Thin QFN 5 ✕ 5  
28 QFN 5 ✕ 5  
MAX1996A  
MODE  
MAX1996AETI  
MAX1996AEGI*  
CRF/SDA  
CTL/SCL  
*Contact factory for availability.  
SMBus is a trademark of Intel Corp.  
THIN QFN  
5mm × 5mm  
________________________________________________________________ Maxim Integrated Products  
1
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.  
1234567...28

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