LP8551 - 用于笔记本电脑的高效 LED 背光驱动器

LP8551是TI德州仪器公司的一款背光产品，LP8551是用于笔记本电脑的高效 LED 背光驱动器，本站介绍了LP8551的封装应用图解、特点和优点、功能等，并给出了与LP8551相关的TI元器件型号供参考。

LP8551 - 用于笔记本电脑的高效 LED 背光驱动器 - 背光 - LED驱动器 - 德州仪器

产品特性

High-Voltage DC/DC Boost Converter with Integrated FET; Four Switching Frequency Options: 156/312/625/1250 kHz
2.7-V to 22-V Input Voltage Range to Support 1x to 5x Cell Li-Ion Batteries
50-mA High-Precision LED Current Sinks
Adaptive LED Current Sink Headroom Control for Maximum System Efficiency
Programmable PWM Resolution 8 to 13 Bits
I2C and PWM Input Duty Cycle Brightness Control
PWM Output Frequency and LED Current Set Through Resistors
4 LED Outputs with LED Fault (short/open) Detection
Low Input Voltage, Overtemperature, Overcurrent Detection, and Shutdown
Minimum Number of External Components

产品应用

Notebook and Tablet LCD Display LED Backlight
LED Lighting

产品说明

The LP8551 is a white LED driver with integrated boost converter. It has four adjustable current sinks which can be controlled by PWM input or with I2C-compatible serial interface.

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 sufficient level in all conditions.

LED outputs have 8-bit current resolution and up to 13-bit PWM resolution 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 capacitors smaller. The Phase Shifting scheme also eliminates audible noise.

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.

The LP8551 has safety features which make it possible to detect LED outputs with open or short fault. As well, low input voltage and boost overcurrent 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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (MAX)
LP8551	DSBGA (25)	2.49 mm x 2.49 mm

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