Texas Instruments TPS929120-Q1 Automotive 40V High-Side LED Driver
Texas Instruments TPS929120-Q1 Automotive 40V High-Side LED Driver with FlexWire interface is a 12-channel, 40V high-side LED driver that controls the 8-bit output current and 12-bit PWM duty cycles. The TPS929120-Q1 meets multiple regulation requirements with LED open-circuit, short-to-ground, and single LED short-circuit diagnostics. The configurable watchdog automatically sets fail-safe states when the MCU connection is lost, and, with programmable EEPROM, TPS929120-Q1 can flexibly be set for different application scenarios.
LED drivers with digital interfaces are essential to drive pixel-controlled lighting applications effectively. In exterior lighting, multiple lamp functions are typically located on different PCB boards with off-board wires connected. A traditional single-ended interface makes it difficult to meet the strict EMC requirements.
The Texas Instruments TPS929120-Q1's UART-based FlexWire interface easily accomplishes long-distance off-board communication without impacting EMC using an industrial-standard CAN physical layer.
Features
- AEC-Q100-qualified for automotive applications
- Temperature grade 1 (-40°C to +125°C, TA)
- Functional safety capable
- Documentation available to aid functional safety system design
- 12-channel precision high-side current output
- Supply voltage 4.5V to 40V
- Up to 75mA channel current set by a resistor
- 2-bit global, 6-bit independent current setting
- High current accuracy < ±5% at 5mA to 75mA
- High current accuracy < ±10% at 1mA
- Low voltage drop 500mV at 50mA
- 12-bit independent PWM dimming
- Programmable PWM frequency up to 20kHz
- Linear and exponential dimming method
- FlexWire control interface
- Up to 1MHz clock frequency
- Maximum 16 devices on one FlexWire bus
- Up to 8 bytes of data transaction in one frame
- 5V 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
Applications
- Automotive exterior rear light
- Automotive exterior headlight
- Automotive interior ambient light
- Automotive cluster display
Block Diagram
Related Development Tool
Texas Instruments TPS929120EVM Evaluation Module
Evaluates the operation and performance of the TPS929120-Q1 LED Driver.
Publicado: 2020-04-14
| Actualizado: 2025-03-13