TI TPS929120－Q1 FlexWire接口12路汽车LED驱动方案

摘要: 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°C到+125°C,电源电压4.5V-40V,由电阻可设定高达75mA通路电流, 5 mA 到 75 mA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,功能框图和应用电路框图,线性LED驱动器电路图以及评估模块TPS929120EVM主要特性,电路图和PCB设计图.
The TPS929120-Q1 includes 12-bit pulse-width modulation (PWM) dimming and offers off-board support – suitable for rear lighting implementations that may span across the entire length of the vehicle, as shown in Figure 2. The TPS929120-Q1 can interface with CAN or LIN communication transceivers, as shown in the digital interface LED driving module reference design, for improved communication robustness.
TPS929120-Q1 is an automotive 12-channel LED driver with FlexWire interface to address increasing requirements for individual control of each LED string. Each of its channel can support both analog dimming and pulse-width-modulation (PWM) dimming, configured through its FlexWire serial interface. The internal electrically erasable programmable read-only memory (EEPROM) allows users to configure device in the scenario of communication lost to fulfill system level safety requirements.
The FlexWire interface is a robust address-based master-slave interface with flexible baud rate. The interface is based on multi-frame universal asynchronous receiver-transmitter (UART) protocol. The unique synchronization frame of F...