LP8550 - 用于笔记本电脑的高效 LED 背光驱动器

LP8550是TI德州仪器公司的一款背光产品，LP8550是用于笔记本电脑的高效 LED 背光驱动器，本站介绍了LP8550的封装应用图解、特点和优点、功能等，并给出了与LP8550相关的TI元器件型号供参考。

LP8550 - 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 with 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
Programmable PWM Resolution
- 8 to 13 True Bits (Steady State)
- 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 VSYNC Signal
Six 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 Netbook LCD Display LED Backlight
LED Lighting

产品说明

The LP8550 is a white-LED driver with integrated boost converter. It has six 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 with additional 1- to 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 capacitors smaller. The Phase Shifting scheme also eliminates audible noise.

Automatic PWM dimming at lower brightness values and current dimming at higher brightness values can be used to improve the optical efficiency. 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 LP8550 has safety features which make it possible to detect LED outputs with open or short fault — 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)
LP8550	DSBGA (25)	2.49 x 2.49 mm

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