[原创] TI LP8863－Q1带升压控制器汽车高效LED驱动方案

TI公司的LP8863-Q1是带升压控制器汽车高效LED驱动器,有六个高精度支持相移的电流沉,通过SPI或I2C接口根据所用的路数单独控制电流沉的亮度,电流精度1%,调光比为32000:1,采用SPI,I2C或PWM输入高达16位LED调光分辨率.满足汽车应用规范AEC-Q100,工作温度–40℃ 到+125℃ ,输入电压3V-48V.主要用在汽车背景光如汽车信息娱乐系统,汽车仪表盘,智能后视镜,抬头显示器 (HUD),中央信息显示屏 (CID)和音视频导航 (AVN).本文介绍了LP8863-Q1主要特性,功能框图和应用电路,以及LED驱动器汽车应用评估模块LP8863-Q1 EVM特性,包括LED负载板的电路图,材料清单和PCB设计图.

The LP8863-Q1 is an automotive high-efficiency LEDdriver with boost controller. The six high-precisioncurrent sinks support phase shifting that isautomatically adjusted based on the number ofchannels in use. Current sink brightness can becontrolled individually and globally through the SPI orI2C interface; brightness can also be globallycontrolled with PWM input.

The boost controller has adaptive output voltagecontrol based on the headroom voltages of the LEDcurrent sinks. This feature minimizes the powerconsumption by adjusting the voltage to the lowestsufficient level in all conditions. A wide-rangeadjustable frequency allows the LP8863-Q1 to avoiddisturbance for AM radio band.

The LP8863-Q1 supports built-in hybrid PWM andcurrent dimming, which reduces EMI, extends theLED lifetime, and increases the total opticalefficiency.

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