With increasing demand for animation in automotive lighting, LEDs must be controlled independently. Therefore, LED drivers with digital interfaces are essential to effectively drive pixel-controlled lighting applications. In exterior lighting, multiple lamp functions are typically located on different PCB boards with off-board wires connected to each other. It is difficult for a traditional single-ended interface to meet the strict EMC requirements. By using an industrial-standard CAN physical layer, the UART-based FlexWire interface of the TPS929121-Q1 easily accomplishes long distance off-board communication without impacting EMC.

The TPS929121-Q1 is a 12-channel, 40-V high-side LED driver that controls the 8-bit output current and 12-bit PWM duty cycles. The device meets multiple regulation requirements with LED open-circuit, short-to-ground, and single LED short-circuit diagnostics. A configurable watchdog also automatically sets fail-safe states when the MCU connection is lost, and, with programmable EEPROM, TPS929121-Q1 can flexibly be set for different application scenarios.

• AEC-Q100-qualified for automotive applications:
  • Temperature grade 1: –40°C to +125°C, TA
• 12-channel precision high-side current output:
  • Supply voltage 4.5 V to 40 V
  • Up to 75-mA channel current set by resistor
  • 2-bit global, 6-bit independent current setting
  • High current accuracy < ±5% at 5 mA to 75 mA
  • High current accuracy < ±10% at 1 mA
  • Low voltage drop 500 mV at 50 mA
  • 12-bit independent PWM dimming
  • Programmable PWM frequency up to 20 kHz
  • Linear and exponential dimming method
• FlexWire control interface
  • Up to 1-MHz clock frequency
  • Maximum 16 devices on one FlexWire bus
  • Up to 8-bytes data transaction in one frame
  • 5-V LDO output to supply CAN transceiver
• Diagnostic and protection:
  • Programmable fail-safe state
  • LED open-circuit detection
  • LED short-circuit detection
  • Single-LED short-circuit diagnostic
  • Programmable low-supply detection
  • Open-drain ERR for fault indication
  • Watchdog and CRC for FlexWire interface
  • 8-Bit ADC for pin voltage measurement
  • Overtemperature protection

• Number of channels (#)
• 12
• Topology
• Current Source
• Rating
• Automotive
• Operating temperature range (C)
• -40 to 125
• Vin (Min) (V)
• 4.5
• Vin (Max) (V)
• 40
• Iout (Max) (A)
• 0.075
• Iq (Typ) (mA)
• 10
• Features
• Enable/Shutdown, Fault Detection, Fault Diagnostic, LED Open Detection, LED Short to Ground Detection, LED Weak Supply Diagnostics, PWM Dimming, Reference Resistor Open or Short Detection, Thermal Error Flag, Thermal Prewarning and Shutdown, Thermal Shutdown

TPS929121-Q1的完整型号有：TPS929121AQPWPRQ1、TPS929121QPWPRQ1，以下是这些产品的关键参数及官网采购报价：

TPS929121AQPWPRQ1，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：NIPDAU，TI官网TPS929121AQPWPRQ1的批量USD价格：1.392（1000+）

TPS929121QPWPRQ1，工作温度：-40 to 125，封装：HTSSOP (PWP)-24，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：NIPDAU，TI官网TPS929121QPWPRQ1的批量USD价格：1.392（1000+）

TPS929120EVM — TPS929120-Q1 12 通道汽车 LED 驱动器评估模块

TPS929120-Q1 评估模块 (EVM) 可帮助设计人员评估 TPS929120-Q1 的运行和性能，这是一款带有 FlexLED 接口的 12 通道 40V 高侧 LED 驱动器，可独立控制汽车照明应用中的输出电流和 PWM 占空比。它还具有 LED 开路、接地短路和单 LED 短路诊断功能。它支持在失去 MCU 连接或没有 MCU 控制时，自动进入预定义的失效防护状态。

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