Datasheet > LP8552TLX

LP8552TLX

更新时间： 2024-11-09 12:09:55

品牌	Logo	应用领域
德州仪器 - TI		驱动器电脑
页数	文件大小	规格书
39页	571K
描述
High-Efficiency LED Backlight Driver for Notebooks

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中文翻译

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数据手册

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LP8552TLX 数据手册

June 6, 2012

LP8552

High-Efficiency LED Backlight Driver for Notebooks

General Description

The LP8552 is a white LED driver with integrated boost con-

verter. It has six adjustable current sinks which can be con-

trolled by PWM input or with I²C-compatible serial interface.

Features

■

High-voltage DC/DC boost converter with integrated FET

with four switching frequency options: 156/312/625/1250

kHz

2.7V to 22V input voltage range to support 1x…5x cell Li-

Ion batteries

Programmable PWM resolution

The boost converter has adaptive output voltage control

based on the LED driver voltages. This feature minimizes the

power consumption by adjusting the voltage to lowest suffi-

cient level in all conditions.

■

8 to 13 true bit (steady state)

—

LED outputs have 8-bit current resolution and up to 13-bit

PWM resolution with additional 1-3 bit dithering to achieve

smooth and precise brightness control. Proprietary Phase

Shift PWM control is used for LED outputs to reduce peak

current from the boost converter, thus making the boost ca-

pacitors smaller. The Phase Shifting scheme also eliminates

audible noise.

Additional 1 to 3 bits using dithering during brightness

changes

I²C and PWM brightness control

■

Automatic PWM & current dimming for improved efficiency

PWM output frequency and LED current set through

resistors

Optional synchronization to display V_SYNCsignal

6 LED outputs with LED fault (short/open) detection

■

Automatic PWM dimming at lower brightness values and cur-

rent dimming at higher brightness values can be used to

improve the optical efficiency.

Low input voltage, over-temperature, over-current

detection and shutdown

Minimum number of external components

Internal EEPROM is used for storing the configuration data.

This makes it possible to have minimum external component

count and make the solution very small.

■

Micro SMD 25-bump package, 2.466 x 2.466 x 0.6 mm

LP8552 has safety features which make it possible to detect

LED outputs with open or short fault. As well low input voltage

and boost over-current conditions are monitored and chip is

turned off in case of these events. Thermal de-rating function

prevents overheating of the device by reducing backlight

brightness when set temperature has been reached.

Applications

Notebook and Netbook LCD Display LED Backlight

■

LED Lighting

LP8552 is available in a micro SMD 25-bump package.

Typical Application (1)

30138170

301381 SNVS693A

www.ti.com

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中文翻译

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与LP8552TLX相关器件

型号	品牌	获取价格	描述	数据表
LP8552TLX/NOPB	TI	获取价格	适用于笔记本电脑的六通道高效 LED 背光驱动器，采用 BGA 封装 \| YZR \| 25
LP8552TLX-E00	TI	获取价格	High-Efficiency LED Backlight Driver for Notebooks
LP8552TLX-E01	TI	获取价格	High-Efficiency LED Backlight Driver for Notebooks
LP8552TLX-E04/NOPB	TI	获取价格	适用于笔记本电脑的六通道高效 LED 背光驱动器，采用 BGA 封装 \| YZR \| 25
LP8552TLX-E06/NOPB	TI	获取价格	适用于笔记本电脑的六通道高效 LED 背光驱动器，采用 BGA 封装 \| YZR \| 25
LP8553	TI	获取价格	High-Efficiency LED Backlight Driver for Notebooks
LP8553TLE	TI	获取价格	High-Efficiency LED Backlight Driver for Notebooks
LP8553TLE/NOPB	TI	获取价格	适用于笔记本电脑的四通道高效 LED 背光驱动器，具有 3.3V PWM 逻辑电平 \| Y
LP8553TLX	TI	获取价格	High-Efficiency LED Backlight Driver for Notebooks
LP8553TLX/NOPB	TI	获取价格	适用于笔记本电脑的四通道高效 LED 背光驱动器，具有 3.3V PWM 逻辑电平 \| Y

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