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AnalogicTech AAT1409八路LED背光驱动方案

文章出处:8gled.com作者:格烁光电发表时间:2018-07-23
沈阳代孕-产后频道FcZe【和您一起看世界】AnalogicTech公司的AAT1409是高度集成高效率的八路led背光驱动器,集成了升压转换器(输出高达45V)和高频PWM调光。AAT1409的VIN范围4.5V 到 5.5V / 5.0V 到26.0V,每路的电流可编程达45mA,总输出电流360mA,可支持881个白光LED。效率高达92%,每路电流精度±2%,路间电流匹配±2%,调光范围1,000:1,主要用在监视器,笔记本电脑,手提TV,手提DVD播放器和白光LED背光。本文介绍了AAT1409主要特性,功能方框图,典型应用电路图以及AAT1409IMK评估板电路图和采用主从配置的288个LED应用电路。

8 ChannEL LED Backlight Driver with Integrated Boost and High Frequency Direct PWM Dimming

The AAT1409 is a highly integrated, high efficiency LED backlight solution for notebook computers, monitors and portable TVs. The device operates from DC inputs, cigarette lighter adapters, or multi-cell Li-ion batteries over the 4.5V to 26V voltage range.

An integrated boost (step-up) converter provides up to 45V output for driving series LEDs. Eight precision current sinks are programmed up to 45mA per string through one external RSET resistor, supporting up to 881 white LEDs at 360mA total output current.

LED strings may be disabled or operated in parallel for increased drive capability. The boost output voltage is set by the LED string with the highest voltage requirement, allowing a wide range of LED characteristics.

The PWM dimming range at 100Hz is up to 1,000:1. The boost switching frequency is selectable (up to 1.3MHz) to allow optimum efficiency and the smallest external L/C filtering components. Alternatively, the device may be synchronized to an external clock. Boost current mode control provides fast response to line and load transients. Integrated Light-Load mode ensures highest efficiency across the entire load range.

Fault tolerant circuitry extends system life by disabling open LED strings. The 山东代孕-【献给母亲的爱nlIM】营养频道unique high voltage current sinks prevent damage resulting from shorted LEDs.

The AAT1409 is available in the Pb-free, thermally enhanced 24-pin 3x4 TQFN package.

AAT1409主要特性:

? VIN Range: 4.5V to 5.5V / 5.0V to 26.0V

? LX Rated to 50V

? Maximum IOUT: 360mA

? Up to 92% Efficiency

? High Efficiency Light-Load Mode

? 8 LED Current Sinks up to 45mA/each

? ±2% Accuracy (21mA)

? ±2% Matching (21mA)

? Flexible Configurations

? Disable or Parallel

? Switching Frequency Options

? 675kHz or 1.3MHz

? Synchronize to System Clock

? PWM Direct Dimming Input

? Up to 100kHz Prevents Audio Interference

? Fast Turn-On/Off

? Wide 1,000:1 Dimming Range (100Hz)

? Fault Tolerant: Open/Short LED(s)

? Current Limit Protection

? Over-Voltage Protection

? Over-Temperature Protection

? Soft-Start Minimizes Inrush Current

? TQFN34-24 Low Profile Package

? -40℃ to +85℃ Temperature Range

AAT1409应用:

? Monitors

? Notebook Computers

? Portable TV

? Portable DVD Players

? White LED Backlight

图1。AAT1409功能方框图

图2。AAT1409典型应用电路图

图3。AAT1409IMK评估板电路图

图4。输出60V/320mA的应用电路:采用主从配置的288个LED

沈阳代孕-产后频道FcZe【和您一起看世界】 AnalogicTech AAT1409八路LED背光驱动方案原创编辑请注明出来http://m.newjuren.com

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