TPS61181 - 适用于笔记本电脑的 1.5A 白光 LED 驱动器

TPS61181是TI德州仪器公司的一款背光产品，TPS61181是适用于笔记本电脑的 1.5A 白光 LED 驱动器，本站介绍了TPS61181的封装应用图解、特点和优点、功能等，并给出了与TPS61181相关的TI元器件型号供参考。

TPS61181 - 适用于笔记本电脑的 1.5A 白光 LED 驱动器 - 背光 - LED驱动器 - 德州仪器

产品描述

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; therefore, reducing 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.

产品特性

5 V to 24 V Input Voltage
Integrated 1.5 A 40V MOSFET
1.0 MHz/1.3 MHz Switching Frequency
Boost Output Auto-Adaptive to WLED Voltages
Small External Components
Integrated Loop Compensation
Six Current Sink of 25mA
Up to 10 WLED in Series
Less Than 3% Current Matching and Accuracy
Up to 1000:1 PWM Brightness DImming Range
Minimized Output Ripple Under PWM Dimming
Driver for Input/Output Isolation PFET
True Shutdown
Over Voltage Protection
WLED Open/Short Protection
Built-in Soft Start
16L 3 mm×3 mm QFN

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