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TPS61182 PDF预览

TPS61182

更新时间: 2024-11-22 04:48:47
品牌 Logo 应用领域
德州仪器 - TI 驱动器显示器电脑
页数 文件大小 规格书
26页 855K
描述
WLED DRIVER FOR NOTEBOOK DISPLAY

TPS61182 数据手册

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TPS61180/1/2  
www.ti.com  
SLVS801ADECEMBER 2007REVISED MARCH 2008  
WLED DRIVER FOR NOTEBOOK DISPLAY  
1
FEATURES  
5 V to 24 V Input Voltage  
True Shutdown  
Integrated 1.5 A 40 V MOSFET  
Over Voltage Protection  
WLED Open/Short Protection  
Built-in Soft Start  
1.0 MHz/1.3 MHz Switching Frequency  
Boost Output Auto-Adaptive to WLED Voltages  
Small External Components  
16L 3 mm×3 mm QFN  
Integrated Loop Compensation  
APPLICATIONS  
Six Current Sink of 25 mA  
Notebook LCD Display Backlight  
UMPC LCD Display Backlight  
Backlight for Media Form Factor LCD display  
Up to 10 WLED in Series  
Less Than 3% Current Matching and Accuracy  
100:1 PWM Brightness Dimming Range  
Minimized Output Ripple Under PWM Dimming  
Driver for Input/Output Isolation PFET  
DESCRIPTION  
The TPS61180/1/2 ICs provide highly integrated solutions for media size LCD backlight. These devices have a  
built-in high efficiency boost regulator with integrated 1.5A/40V power MOSFET. The six current sink regulators  
provide high precision current regulation and matching. In total, the device can support up to 60 WLED. In  
addition, the boost output automatically adjusts its voltage to the WLED forward voltage to improve efficiency.  
The devices support pulse width modulation (PWM) brightness dimming. During dimming, the WLED current is  
turned on/off at the duty cycle and frequency determined by the PWM signal input on the DCRTL pin. One  
potential issue of PWM dimming is audible noises from the output ceramic capacitors. The TPS61180/1/2 family  
is designed to minimize this output AC ripple across a wide dimming duty cycle and frequency range; and,  
therefore reduce the audible noise.  
The TPS61180/1/2 ICs provide a driver output for an external PFET connected between the input and inductor.  
During short circuit or over-current conditions, the ICs turn off the external PFET and disconnect the battery from  
the WLEDs. The PFET is also turned off during IC shutdown (true shutdown) to prevent any leakage current of  
the battery. The device also integrates over-voltage protection, soft-start and thermal shutdown.  
The TPS61180 IC requires external 3.3V IC supply, while TPS61181 and TPS61182 ICs have a built-in linear  
regulator for the IC supply. All the devices are in a 3×3 mm QFN package.  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2007–2008, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  

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