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Texas Instruments TPS929120-Q1 Automotive 40V Highside 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 effectively drive pixel-controlled lighting applications. In exterior lighting, multiple lamp functions are typically located on different PCB boards with off-board wires connected. It is difficult for a traditional single-ended interface to meet the strict EMC requirements.

The UART-based FlexWire interface of the TPS929120-Q1 easily accomplishes long-distance off-board communication without impacting EMC by using an industrial-standard CAN physical layer.

Features

AEC-Q100-qualified for automotive applications:
- Temperature grade 1: –40°C to +125°C, T_A
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 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

Texas Instruments TPS929120-Q1 Automotive 40V Highside LED Driver

Features

Applications

Block Diagram

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