TPS929240-Q1中文资料德州仪器数据手册PDF规格书

1 Features

• AEC-Q100 qualified for automotive applications:

– Temperature grade 1: –40°C to +125°C, TA

• 24-Channel precision high-side current output:

– Supply voltage 4.5 V to 40 V

– Up to 100-mA channel current set by resistor

– 2-bit global, 6-bit independent current setting

– High-current accuracy < ±5 at 5 mA to 100

mA

– Low voltage drop 500 mV at 50 mA

– 12-bit independent PWM dimming

– Programmable PWM frequency up to 20 kHz

– Phase-shift PWM dimming

– Linear and exponential dimming method

• FlexWire control interface

– Up to 1-MHz clock frequency

– Maximum 16 devices on one FlexWire bus

– Up to 24 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

2 Applications

• Automotive exterior rear light

• Automotive exterior headlight

• Automotive interior ambient light

• Automotive cluster display

3 Description

With the increasing demand for animation in

automotive lighting, LEDs must be controlled

independently. Therefore, LED drivers with digital

interfaces are essential to effectively drive pixelcontrolled

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 singleended

interface to meet the strict EMC requirements.

By using an industrial-standard CAN physical

layer, the UART-based FlexWire interface of the

TPS929240-Q1 easily accomplishes long distance offboard

communication without impacting EMC.

The TPS929240-Q1 is a 24-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, shortto-

ground, and single LED short-circuit diagnostics.

A configurable watchdog also automatically sets FAILSAFE

states when the MCU connection is lost, and,

with programmable EEPROM, TPS929240-Q1 can

flexibly be set for different application scenarios.