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[原创] TI TPS929120-Q1数字接口汽车尾灯12路LED驱动方案

关键词:汽车电子 LED驱动器 TPS929120-Q1

时间:2019-11-25 13:04:53       来源:中电网

TI公司的TPS929120-Q1是汽车电子12路40V高边LED驱动器,具有FlexWire接口为每个LED串的单独控制满足日益增长的需求.通过FlexWire串行接口配置,每路能支持模拟调光和PWM调光.内部的电可擦可编程只读存储(EEPROM)允许用户配置设备,以满足系统级安全要求.TPS929120-Q1能控制8位输出电流和12位PWM占空比周期,满足LED开路,短路到地和单个LED短路诊断等多个调整要求.当MCU的连接丢失时,可配置看门狗能自动设定故障状态,而采用可编程的EEPROM,TPS929120-Q1能灵活地设定各中应用方案.器件满足汽车应用的AEC-Q100规范,工作温度–40℃到+125℃,电源电压4.5V-40V,由电阻可设定高达75mA通路电流,5 mA 到 75mA时的大电流精度优于±5%,在1mA时的电流精度优于±10%,50mA时的压降500mV,12位单独PWM调光,可编程PWM频率高达20kHz,主要用在汽车外部尾灯,汽车面板指示器和汽车RGB大气照明.本文介绍了TPS929120-Q1主要特性,功能框图,应用框图,以及参考设计TIDA-020029主要特性和指标,硬件测试建立图,电路图,材料清单和PCB设计图.

TPS929120-Q1 is an automotive 12-channel LED driver with FlexWire interface to address increasingrequirements for individual control of each LED string. Each of its channel can support both analog dimming andpulse-width-modulation (PWM) dimming, configured through its FlexWire serial interface. The internal electricallyerasable programmable read-only memory (EEPROM) allows users to configure device in the scenario ofcommunication lost to fulfill system level safety requirements.

The FlexWire interface is a robust address-based master-slave interface with flexible baud rate. The interface isbased on multi-frame universal asynchronous receiver-..

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